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init/Kconfig
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# SPDX-License-Identifier: GPL-2.0-only |
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config DEFCONFIG_LIST string |
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depends on !UML |
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option defconfig_list |
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default "/lib/modules/$(shell,uname -r)/.config" |
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default "/etc/kernel-config" |
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default "/boot/config-$(shell,uname -r)" |
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default ARCH_DEFCONFIG default "arch/$(ARCH)/defconfig" |
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config CC_IS_GCC def_bool $(success,$(CC) --version | head -n 1 | grep -q gcc) config GCC_VERSION int |
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default $(shell,$(srctree)/scripts/gcc-version.sh $(CC)) if CC_IS_GCC |
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default 0 |
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config CC_IS_CLANG def_bool $(success,$(CC) --version | head -n 1 | grep -q clang) config CLANG_VERSION int default $(shell,$(srctree)/scripts/clang-version.sh $(CC)) |
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config CC_CAN_LINK def_bool $(success,$(srctree)/scripts/cc-can-link.sh $(CC)) |
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config CC_HAS_ASM_GOTO def_bool $(success,$(srctree)/scripts/gcc-goto.sh $(CC)) |
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config TOOLS_SUPPORT_RELR |
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def_bool $(success,env "CC=$(CC)" "LD=$(LD)" "NM=$(NM)" "OBJCOPY=$(OBJCOPY)" $(srctree)/scripts/tools-support-relr.sh) |
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config CC_HAS_ASM_INLINE def_bool $(success,echo 'void foo(void) { asm inline (""); }' | $(CC) -x c - -c -o /dev/null) |
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config CC_HAS_WARN_MAYBE_UNINITIALIZED def_bool $(cc-option,-Wmaybe-uninitialized) help GCC >= 4.7 supports this option. config CC_DISABLE_WARN_MAYBE_UNINITIALIZED bool depends on CC_HAS_WARN_MAYBE_UNINITIALIZED default CC_IS_GCC && GCC_VERSION < 40900 # unreliable for GCC < 4.9 help GCC's -Wmaybe-uninitialized is not reliable by definition. Lots of false positive warnings are produced in some cases. If this option is enabled, -Wno-maybe-uninitialzed is passed to the compiler to suppress maybe-uninitialized warnings. |
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config CONSTRUCTORS bool |
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depends on !UML |
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config IRQ_WORK bool |
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config BUILDTIME_EXTABLE_SORT bool |
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config THREAD_INFO_IN_TASK bool help Select this to move thread_info off the stack into task_struct. To make this work, an arch will need to remove all thread_info fields except flags and fix any runtime bugs. |
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One subtle change that will be needed is to use try_get_task_stack() and put_task_stack() in save_thread_stack_tsk() and get_wchan(). |
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menu "General setup" |
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config BROKEN bool |
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config BROKEN_ON_SMP bool depends on BROKEN || !SMP default y |
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config INIT_ENV_ARG_LIMIT int |
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default 32 if !UML default 128 if UML |
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help |
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Maximum of each of the number of arguments and environment variables passed to init from the kernel command line. |
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config COMPILE_TEST bool "Compile also drivers which will not load" |
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depends on !UML |
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default n help Some drivers can be compiled on a different platform than they are intended to be run on. Despite they cannot be loaded there (or even when they load they cannot be used due to missing HW support), developers still, opposing to distributors, might want to build such drivers to compile-test them. If you are a developer and want to build everything available, say Y here. If you are a user/distributor, say N here to exclude useless drivers to be distributed. |
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config UAPI_HEADER_TEST bool "Compile test UAPI headers" |
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depends on HEADERS_INSTALL && CC_CAN_LINK |
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help Compile test headers exported to user-space to ensure they are self-contained, i.e. compilable as standalone units. If you are a developer or tester and want to ensure the exported headers are self-contained, say Y here. Otherwise, choose N. |
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config LOCALVERSION string "Local version - append to kernel release" help Append an extra string to the end of your kernel version. This will show up when you type uname, for example. The string you set here will be appended after the contents of any files with a filename matching localversion* in your object and source tree, in that order. Your total string can be a maximum of 64 characters. |
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config LOCALVERSION_AUTO bool "Automatically append version information to the version string" default y |
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depends on !COMPILE_TEST |
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help This will try to automatically determine if the current tree is a |
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release tree by looking for git tags that belong to the current top of tree revision. |
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A string of the format -gxxxxxxxx will be added to the localversion |
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if a git-based tree is found. The string generated by this will be |
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appended after any matching localversion* files, and after the value |
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set in CONFIG_LOCALVERSION. |
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(The actual string used here is the first eight characters produced by running the command: $ git rev-parse --verify HEAD which is done within the script "scripts/setlocalversion".) |
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config BUILD_SALT string "Build ID Salt" default "" help The build ID is used to link binaries and their debug info. Setting this option will use the value in the calculation of the build id. This is mostly useful for distributions which want to ensure the build is unique between builds. It's safe to leave the default. |
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config HAVE_KERNEL_GZIP bool config HAVE_KERNEL_BZIP2 bool config HAVE_KERNEL_LZMA bool |
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config HAVE_KERNEL_XZ bool |
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config HAVE_KERNEL_LZO bool |
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config HAVE_KERNEL_LZ4 bool |
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config HAVE_KERNEL_UNCOMPRESSED bool |
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choice |
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prompt "Kernel compression mode" default KERNEL_GZIP |
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depends on HAVE_KERNEL_GZIP || HAVE_KERNEL_BZIP2 || HAVE_KERNEL_LZMA || HAVE_KERNEL_XZ || HAVE_KERNEL_LZO || HAVE_KERNEL_LZ4 || HAVE_KERNEL_UNCOMPRESSED |
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help |
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The linux kernel is a kind of self-extracting executable. Several compression algorithms are available, which differ in efficiency, compression and decompression speed. Compression speed is only relevant when building a kernel. Decompression speed is relevant at each boot. If you have any problems with bzip2 or lzma compressed kernels, mail me (Alain Knaff) <alain@knaff.lu>. (An older version of this functionality (bzip2 only), for 2.4, was supplied by Christian Ludwig) High compression options are mostly useful for users, who are low on disk space (embedded systems), but for whom ram size matters less. If in doubt, select 'gzip' config KERNEL_GZIP |
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bool "Gzip" depends on HAVE_KERNEL_GZIP help |
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The old and tried gzip compression. It provides a good balance between compression ratio and decompression speed. |
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config KERNEL_BZIP2 bool "Bzip2" |
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depends on HAVE_KERNEL_BZIP2 |
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help Its compression ratio and speed is intermediate. |
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Decompression speed is slowest among the choices. The kernel |
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size is about 10% smaller with bzip2, in comparison to gzip. Bzip2 uses a large amount of memory. For modern kernels you will need at least 8MB RAM or more for booting. |
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config KERNEL_LZMA |
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bool "LZMA" depends on HAVE_KERNEL_LZMA help |
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This compression algorithm's ratio is best. Decompression speed is between gzip and bzip2. Compression is slowest. The kernel size is about 33% smaller with LZMA in comparison to gzip. |
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config KERNEL_XZ bool "XZ" depends on HAVE_KERNEL_XZ help XZ uses the LZMA2 algorithm and instruction set specific BCJ filters which can improve compression ratio of executable code. The size of the kernel is about 30% smaller with XZ in comparison to gzip. On architectures for which there is a BCJ filter (i386, x86_64, ARM, IA-64, PowerPC, and SPARC), XZ will create a few percent smaller kernel than plain LZMA. The speed is about the same as with LZMA: The decompression speed of XZ is better than that of bzip2 but worse than gzip and LZO. Compression is slow. |
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config KERNEL_LZO bool "LZO" depends on HAVE_KERNEL_LZO help |
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Its compression ratio is the poorest among the choices. The kernel |
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size is about 10% bigger than gzip; however its speed |
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(both compression and decompression) is the fastest. |
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config KERNEL_LZ4 bool "LZ4" depends on HAVE_KERNEL_LZ4 help LZ4 is an LZ77-type compressor with a fixed, byte-oriented encoding. A preliminary version of LZ4 de/compression tool is available at <https://code.google.com/p/lz4/>. Its compression ratio is worse than LZO. The size of the kernel is about 8% bigger than LZO. But the decompression speed is faster than LZO. |
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config KERNEL_UNCOMPRESSED bool "None" depends on HAVE_KERNEL_UNCOMPRESSED help Produce uncompressed kernel image. This option is usually not what you want. It is useful for debugging the kernel in slow simulation environments, where decompressing and moving the kernel is awfully slow. This option allows early boot code to skip the decompressor and jump right at uncompressed kernel image. |
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endchoice |
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config DEFAULT_HOSTNAME string "Default hostname" default "(none)" help This option determines the default system hostname before userspace calls sethostname(2). The kernel traditionally uses "(none)" here, but you may wish to use a different default here to make a minimal system more usable with less configuration. |
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# # For some reason microblaze and nios2 hard code SWAP=n. Hopefully we can # add proper SWAP support to them, in which case this can be remove. # config ARCH_NO_SWAP bool |
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config SWAP bool "Support for paging of anonymous memory (swap)" |
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depends on MMU && BLOCK && !ARCH_NO_SWAP |
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default y help This option allows you to choose whether you want to have support |
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for so called swap devices or swap files in your kernel that are |
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used to provide more virtual memory than the actual RAM present in your computer. If unsure say Y. config SYSVIPC bool "System V IPC" |
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---help--- Inter Process Communication is a suite of library functions and system calls which let processes (running programs) synchronize and exchange information. It is generally considered to be a good thing, and some programs won't run unless you say Y here. In particular, if you want to run the DOS emulator dosemu under Linux (read the DOSEMU-HOWTO, available from <http://www.tldp.org/docs.html#howto>), you'll need to say Y here. You can find documentation about IPC with "info ipc" and also in section 6.4 of the Linux Programmer's Guide, available from <http://www.tldp.org/guides.html>. |
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config SYSVIPC_SYSCTL bool depends on SYSVIPC depends on SYSCTL default y |
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config POSIX_MQUEUE bool "POSIX Message Queues" |
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depends on NET |
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---help--- POSIX variant of message queues is a part of IPC. In POSIX message queues every message has a priority which decides about succession of receiving it by a process. If you want to compile and run programs written e.g. for Solaris with use of its POSIX message |
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queues (functions mq_*) say Y here. |
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POSIX message queues are visible as a filesystem called 'mqueue' and can be mounted somewhere if you want to do filesystem operations on message queues. If unsure, say Y. |
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config POSIX_MQUEUE_SYSCTL bool depends on POSIX_MQUEUE depends on SYSCTL default y |
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config CROSS_MEMORY_ATTACH bool "Enable process_vm_readv/writev syscalls" depends on MMU default y help Enabling this option adds the system calls process_vm_readv and process_vm_writev which allow a process with the correct privileges |
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to directly read from or write to another process' address space. |
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See the man page for more details. |
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config USELIB bool "uselib syscall" |
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def_bool ALPHA || M68K || SPARC || X86_32 || IA32_EMULATION |
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help This option enables the uselib syscall, a system call used in the dynamic linker from libc5 and earlier. glibc does not use this system call. If you intend to run programs built on libc5 or earlier, you may need to enable this syscall. Current systems running glibc can safely disable this. |
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config AUDIT bool "Auditing support" depends on NET help Enable auditing infrastructure that can be used with another kernel subsystem, such as SELinux (which requires this for |
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logging of avc messages output). System call auditing is included on architectures which support it. |
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config HAVE_ARCH_AUDITSYSCALL bool |
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config AUDITSYSCALL |
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def_bool y |
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depends on AUDIT && HAVE_ARCH_AUDITSYSCALL |
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select FSNOTIFY |
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source "kernel/irq/Kconfig" source "kernel/time/Kconfig" |
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source "kernel/Kconfig.preempt" |
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menu "CPU/Task time and stats accounting" |
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config VIRT_CPU_ACCOUNTING bool |
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choice prompt "Cputime accounting" default TICK_CPU_ACCOUNTING if !PPC64 |
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default VIRT_CPU_ACCOUNTING_NATIVE if PPC64 |
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# Kind of a stub config for the pure tick based cputime accounting config TICK_CPU_ACCOUNTING bool "Simple tick based cputime accounting" |
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depends on !S390 && !NO_HZ_FULL |
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help This is the basic tick based cputime accounting that maintains statistics about user, system and idle time spent on per jiffies granularity. If unsure, say Y. |
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config VIRT_CPU_ACCOUNTING_NATIVE |
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bool "Deterministic task and CPU time accounting" |
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depends on HAVE_VIRT_CPU_ACCOUNTING && !NO_HZ_FULL |
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select VIRT_CPU_ACCOUNTING |
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help Select this option to enable more accurate task and CPU time accounting. This is done by reading a CPU counter on each kernel entry and exit and on transitions within the kernel between system, softirq and hardirq state, so there is a small performance impact. In the case of s390 or IBM POWER > 5, this also enables accounting of stolen time on logically-partitioned systems. |
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config VIRT_CPU_ACCOUNTING_GEN bool "Full dynticks CPU time accounting" |
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depends on HAVE_CONTEXT_TRACKING |
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depends on HAVE_VIRT_CPU_ACCOUNTING_GEN |
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depends on GENERIC_CLOCKEVENTS |
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select VIRT_CPU_ACCOUNTING select CONTEXT_TRACKING help Select this option to enable task and CPU time accounting on full dynticks systems. This accounting is implemented by watching every kernel-user boundaries using the context tracking subsystem. The accounting is thus performed at the expense of some significant overhead. For now this is only useful if you are working on the full dynticks subsystem development. If unsure, say N. |
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endchoice |
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config IRQ_TIME_ACCOUNTING bool "Fine granularity task level IRQ time accounting" |
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depends on HAVE_IRQ_TIME_ACCOUNTING && !VIRT_CPU_ACCOUNTING_NATIVE |
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help Select this option to enable fine granularity task irq time accounting. This is done by reading a timestamp on each transitions between softirq and hardirq state, so there can be a small performance impact. If in doubt, say N here. |
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config HAVE_SCHED_AVG_IRQ def_bool y depends on IRQ_TIME_ACCOUNTING || PARAVIRT_TIME_ACCOUNTING depends on SMP |
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config BSD_PROCESS_ACCT bool "BSD Process Accounting" |
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depends on MULTIUSER |
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help If you say Y here, a user level program will be able to instruct the kernel (via a special system call) to write process accounting information to a file: whenever a process exits, information about that process will be appended to the file by the kernel. The information includes things such as creation time, owning user, command name, memory usage, controlling terminal etc. (the complete list is in the struct acct in <file:include/linux/acct.h>). It is up to the user level program to do useful things with this information. This is generally a good idea, so say Y. config BSD_PROCESS_ACCT_V3 bool "BSD Process Accounting version 3 file format" depends on BSD_PROCESS_ACCT default n help If you say Y here, the process accounting information is written in a new file format that also logs the process IDs of each |
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process and its parent. Note that this file format is incompatible |
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with previous v0/v1/v2 file formats, so you will need updated tools for processing it. A preliminary version of these tools is available |
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at <http://www.gnu.org/software/acct/>. |
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config TASKSTATS |
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bool "Export task/process statistics through netlink" |
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depends on NET |
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depends on MULTIUSER |
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default n help Export selected statistics for tasks/processes through the generic netlink interface. Unlike BSD process accounting, the statistics are available during the lifetime of tasks/processes as responses to commands. Like BSD accounting, they are sent to user space on task exit. Say N if unsure. |
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config TASK_DELAY_ACCT |
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bool "Enable per-task delay accounting" |
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depends on TASKSTATS |
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select SCHED_INFO |
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help Collect information on time spent by a task waiting for system resources like cpu, synchronous block I/O completion and swapping in pages. Such statistics can help in setting a task's priorities relative to other tasks for cpu, io, rss limits etc. Say N if unsure. |
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config TASK_XACCT |
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bool "Enable extended accounting over taskstats" |
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depends on TASKSTATS help Collect extended task accounting data and send the data to userland for processing over the taskstats interface. Say N if unsure. config TASK_IO_ACCOUNTING |
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bool "Enable per-task storage I/O accounting" |
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depends on TASK_XACCT help Collect information on the number of bytes of storage I/O which this task has caused. Say N if unsure. |
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config PSI bool "Pressure stall information tracking" help Collect metrics that indicate how overcommitted the CPU, memory, and IO capacity are in the system. If you say Y here, the kernel will create /proc/pressure/ with the pressure statistics files cpu, memory, and io. These will indicate the share of walltime in which some or all tasks in the system are delayed due to contention of the respective resource. |
2ce7135ad psi: cgroup support |
489 490 491 |
In kernels with cgroup support, cgroups (cgroup2 only) will have cpu.pressure, memory.pressure, and io.pressure files, which aggregate pressure stalls for the grouped tasks only. |
c3123552a docs: accounting:... |
492 |
For more details see Documentation/accounting/psi.rst. |
eb414681d psi: pressure sta... |
493 494 |
Say N if unsure. |
e0c274472 psi: make disabli... |
495 496 497 498 499 500 |
config PSI_DEFAULT_DISABLED bool "Require boot parameter to enable pressure stall information tracking" default n depends on PSI help If set, pressure stall information tracking will be disabled |
428a1cb4b psi: fix referenc... |
501 502 |
per default but can be enabled through passing psi=1 on the kernel commandline during boot. |
e0c274472 psi: make disabli... |
503 |
|
7b2489d37 psi: clarify the ... |
504 505 506 507 508 509 510 511 512 513 |
This feature adds some code to the task wakeup and sleep paths of the scheduler. The overhead is too low to affect common scheduling-intense workloads in practice (such as webservers, memcache), but it does show up in artificial scheduler stress tests, such as hackbench. If you are paranoid and not sure what the kernel will be used for, say Y. Say N if unsure. |
391dc69c6 cputime: Gather t... |
514 |
endmenu # "CPU/Task time and stats accounting" |
d9817ebee genirq: Provide K... |
515 |
|
5c4991e24 sched/isolation: ... |
516 517 |
config CPU_ISOLATION bool "CPU isolation" |
414a2dc13 sched/isolation: ... |
518 |
depends on SMP || COMPILE_TEST |
2c43838c9 sched/isolation: ... |
519 |
default y |
5c4991e24 sched/isolation: ... |
520 521 522 |
help Make sure that CPUs running critical tasks are not disturbed by any source of "noise" such as unbound workqueues, timers, kthreads... |
2c43838c9 sched/isolation: ... |
523 524 525 526 |
Unbound jobs get offloaded to housekeeping CPUs. This is driven by the "isolcpus=" boot parameter. Say Y if unsure. |
5c4991e24 sched/isolation: ... |
527 |
|
0af92d460 rcu: Move RCU non... |
528 |
source "kernel/rcu/Kconfig" |
c903ff837 rcu: move Kconfig... |
529 |
|
de5b56ba5 kernel: build bin... |
530 531 532 |
config BUILD_BIN2C bool default n |
1da177e4c Linux-2.6.12-rc2 |
533 |
config IKCONFIG |
f2443ab6c [PATCH] allow /pr... |
534 |
tristate "Kernel .config support" |
1da177e4c Linux-2.6.12-rc2 |
535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 |
---help--- This option enables the complete Linux kernel ".config" file contents to be saved in the kernel. It provides documentation of which kernel options are used in a running kernel or in an on-disk kernel. This information can be extracted from the kernel image file with the script scripts/extract-ikconfig and used as input to rebuild the current kernel or to build another kernel. It can also be extracted from a running kernel by reading /proc/config.gz if enabled (below). config IKCONFIG_PROC bool "Enable access to .config through /proc/config.gz" depends on IKCONFIG && PROC_FS ---help--- This option enables access to the kernel configuration file through /proc/config.gz. |
f7b101d33 kheaders: Move fr... |
551 552 553 554 555 556 557 558 |
config IKHEADERS tristate "Enable kernel headers through /sys/kernel/kheaders.tar.xz" depends on SYSFS help This option enables access to the in-kernel headers that are generated during the build process. These can be used to build eBPF tracing programs, or similar programs. If you build the headers as a module, a module called kheaders.ko is built which can be loaded on-demand to get access to headers. |
43d8ce9d6 Provide in-kernel... |
559 |
|
794543a23 Move LOG_BUF_SHIF... |
560 561 |
config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" |
fb39f98d1 printk: Increase ... |
562 |
range 12 25 |
f17a32e97 let LOG_BUF_SHIFT... |
563 |
default 17 |
361e9dfba init/Kconfig: Hid... |
564 |
depends on PRINTK |
794543a23 Move LOG_BUF_SHIF... |
565 |
help |
23b2899f7 printk: allow inc... |
566 567 568 569 |
Select the minimal kernel log buffer size as a power of 2. The final size is affected by LOG_CPU_MAX_BUF_SHIFT config parameter, see below. Any higher size also might be forced by "log_buf_len" boot parameter. |
f17a32e97 let LOG_BUF_SHIFT... |
570 |
Examples: |
23b2899f7 printk: allow inc... |
571 |
17 => 128 KB |
f17a32e97 let LOG_BUF_SHIFT... |
572 |
16 => 64 KB |
23b2899f7 printk: allow inc... |
573 574 |
15 => 32 KB 14 => 16 KB |
794543a23 Move LOG_BUF_SHIF... |
575 576 |
13 => 8 KB 12 => 4 KB |
23b2899f7 printk: allow inc... |
577 578 |
config LOG_CPU_MAX_BUF_SHIFT int "CPU kernel log buffer size contribution (13 => 8 KB, 17 => 128KB)" |
2240a31db printk: don't bot... |
579 |
depends on SMP |
23b2899f7 printk: allow inc... |
580 581 582 |
range 0 21 default 12 if !BASE_SMALL default 0 if BASE_SMALL |
361e9dfba init/Kconfig: Hid... |
583 |
depends on PRINTK |
23b2899f7 printk: allow inc... |
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 |
help This option allows to increase the default ring buffer size according to the number of CPUs. The value defines the contribution of each CPU as a power of 2. The used space is typically only few lines however it might be much more when problems are reported, e.g. backtraces. The increased size means that a new buffer has to be allocated and the original static one is unused. It makes sense only on systems with more CPUs. Therefore this value is used only when the sum of contributions is greater than the half of the default kernel ring buffer as defined by LOG_BUF_SHIFT. The default values are set so that more than 64 CPUs are needed to trigger the allocation. Also this option is ignored when "log_buf_len" kernel parameter is used as it forces an exact (power of two) size of the ring buffer. The number of possible CPUs is used for this computation ignoring |
5e0d8d59a init: fix Kconfig... |
602 603 |
hotplugging making the computation optimal for the worst case scenario while allowing a simple algorithm to be used from bootup. |
23b2899f7 printk: allow inc... |
604 605 606 607 608 609 610 611 |
Examples shift values and their meaning: 17 => 128 KB for each CPU 16 => 64 KB for each CPU 15 => 32 KB for each CPU 14 => 16 KB for each CPU 13 => 8 KB for each CPU 12 => 4 KB for each CPU |
f92bac3b1 printk: rename nm... |
612 613 |
config PRINTK_SAFE_LOG_BUF_SHIFT int "Temporary per-CPU printk log buffer size (12 => 4KB, 13 => 8KB)" |
427934b87 printk/nmi: incre... |
614 615 |
range 10 21 default 13 |
f92bac3b1 printk: rename nm... |
616 |
depends on PRINTK |
427934b87 printk/nmi: incre... |
617 |
help |
f92bac3b1 printk: rename nm... |
618 619 620 621 622 |
Select the size of an alternate printk per-CPU buffer where messages printed from usafe contexts are temporary stored. One example would be NMI messages, another one - printk recursion. The messages are copied to the main log buffer in a safe context to avoid a deadlock. The value defines the size as a power of 2. |
427934b87 printk/nmi: incre... |
623 |
|
f92bac3b1 printk: rename nm... |
624 |
Those messages are rare and limited. The largest one is when |
427934b87 printk/nmi: incre... |
625 626 627 628 629 630 631 632 633 634 |
a backtrace is printed. It usually fits into 4KB. Select 8KB if you want to be on the safe side. Examples: 17 => 128 KB for each CPU 16 => 64 KB for each CPU 15 => 32 KB for each CPU 14 => 16 KB for each CPU 13 => 8 KB for each CPU 12 => 4 KB for each CPU |
a5574cf65 sched, x86: add H... |
635 636 637 638 639 |
# # Architectures with an unreliable sched_clock() should select this: # config HAVE_UNSTABLE_SCHED_CLOCK bool |
38ff87f77 sched_clock: Make... |
640 641 |
config GENERIC_SCHED_CLOCK bool |
69842cba9 sched/uclamp: Add... |
642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 |
menu "Scheduler features" config UCLAMP_TASK bool "Enable utilization clamping for RT/FAIR tasks" depends on CPU_FREQ_GOV_SCHEDUTIL help This feature enables the scheduler to track the clamped utilization of each CPU based on RUNNABLE tasks scheduled on that CPU. With this option, the user can specify the min and max CPU utilization allowed for RUNNABLE tasks. The max utilization defines the maximum frequency a task should use while the min utilization defines the minimum frequency it should use. Both min and max utilization clamp values are hints to the scheduler, aiming at improving its frequency selection policy, but they do not enforce or grant any specific bandwidth for tasks. If in doubt, say N. config UCLAMP_BUCKETS_COUNT int "Number of supported utilization clamp buckets" range 5 20 default 5 depends on UCLAMP_TASK help Defines the number of clamp buckets to use. The range of each bucket will be SCHED_CAPACITY_SCALE/UCLAMP_BUCKETS_COUNT. The higher the number of clamp buckets the finer their granularity and the higher the precision of clamping aggregation and tracking at run-time. For example, with the minimum configuration value we will have 5 clamp buckets tracking 20% utilization each. A 25% boosted tasks will be refcounted in the [20..39]% bucket and will set the bucket clamp effective value to 25%. If a second 30% boosted task should be co-scheduled on the same CPU, that task will be refcounted in the same bucket of the first task and it will boost the bucket clamp effective value to 30%. The clamp effective value of a bucket is reset to its nominal value (20% in the example above) when there are no more tasks refcounted in that bucket. An additional boost/capping margin can be added to some tasks. In the example above the 25% task will be boosted to 30% until it exits the CPU. If that should be considered not acceptable on certain systems, it's always possible to reduce the margin by increasing the number of clamp buckets to trade off used memory for run-time tracking precision. If in doubt, use the default value. endmenu |
be3a72842 mm: numa: pte_num... |
694 695 696 697 698 699 |
# # For architectures that want to enable the support for NUMA-affine scheduler # balancing logic: # config ARCH_SUPPORTS_NUMA_BALANCING bool |
be5e610c0 math64: Add mul_u... |
700 |
# |
72b252aed mm: send one IPI ... |
701 702 703 704 705 706 707 708 709 710 |
# For architectures that prefer to flush all TLBs after a number of pages # are unmapped instead of sending one IPI per page to flush. The architecture # must provide guarantees on what happens if a clean TLB cache entry is # written after the unmap. Details are in mm/rmap.c near the check for # should_defer_flush. The architecture should also consider if the full flush # and the refill costs are offset by the savings of sending fewer IPIs. config ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH bool # |
be5e610c0 math64: Add mul_u... |
711 712 713 714 |
# For architectures that know their GCC __int128 support is sound # config ARCH_SUPPORTS_INT128 bool |
be3a72842 mm: numa: pte_num... |
715 716 717 718 719 |
# For architectures that (ab)use NUMA to represent different memory regions # all cpu-local but of different latencies, such as SuperH. # config ARCH_WANT_NUMA_VARIABLE_LOCALITY bool |
be3a72842 mm: numa: pte_num... |
720 721 |
config NUMA_BALANCING bool "Memory placement aware NUMA scheduler" |
be3a72842 mm: numa: pte_num... |
722 723 724 725 726 727 |
depends on ARCH_SUPPORTS_NUMA_BALANCING depends on !ARCH_WANT_NUMA_VARIABLE_LOCALITY depends on SMP && NUMA && MIGRATION help This option adds support for automatic NUMA aware memory/task placement. The mechanism is quite primitive and is based on migrating memory when |
6d56a410a NUMA: fix typos i... |
728 |
it has references to the node the task is running on. |
be3a72842 mm: numa: pte_num... |
729 730 |
This system will be inactive on UMA systems. |
6f7c97e80 mm/numa balancing... |
731 732 733 734 735 736 737 |
config NUMA_BALANCING_DEFAULT_ENABLED bool "Automatically enable NUMA aware memory/task placement" default y depends on NUMA_BALANCING help If set, automatic NUMA balancing will be enabled if running on a NUMA machine. |
23964d2d0 cgroups: clean up... |
738 |
menuconfig CGROUPS |
6341e62b2 kconfig: use bool... |
739 |
bool "Control Group support" |
2bd59d48e cgroup: convert t... |
740 |
select KERNFS |
5cdc38f98 cgroups: make cgr... |
741 |
help |
23964d2d0 cgroups: clean up... |
742 |
This option adds support for grouping sets of processes together, for |
5cdc38f98 cgroups: make cgr... |
743 744 745 |
use with process control subsystems such as Cpusets, CFS, memory controls or device isolation. See |
d6a3b2476 docs: scheduler: ... |
746 |
- Documentation/scheduler/sched-design-CFS.rst (CFS) |
da82c92f1 docs: cgroup-v1: ... |
747 |
- Documentation/admin-guide/cgroup-v1/ (features for grouping, isolation |
45ce80fb6 cgroups: consolid... |
748 |
and resource control) |
5cdc38f98 cgroups: make cgr... |
749 750 |
Say N if unsure. |
23964d2d0 cgroups: clean up... |
751 |
if CGROUPS |
3e32cb2e0 mm: memcontrol: l... |
752 753 |
config PAGE_COUNTER bool |
c255a4580 memcg: rename con... |
754 |
config MEMCG |
a0166ec4b cgroup: clean up ... |
755 |
bool "Memory controller" |
3e32cb2e0 mm: memcontrol: l... |
756 |
select PAGE_COUNTER |
79bd9814e cgroup, memcg: mo... |
757 |
select EVENTFD |
00f0b8259 Memory controller... |
758 |
help |
a0166ec4b cgroup: clean up ... |
759 |
Provides control over the memory footprint of tasks in a cgroup. |
00f0b8259 Memory controller... |
760 |
|
c255a4580 memcg: rename con... |
761 |
config MEMCG_SWAP |
a0166ec4b cgroup: clean up ... |
762 |
bool "Swap controller" |
c255a4580 memcg: rename con... |
763 |
depends on MEMCG && SWAP |
c077719be memcg: mem+swap c... |
764 |
help |
a0166ec4b cgroup: clean up ... |
765 |
Provides control over the swap space consumed by tasks in a cgroup. |
c255a4580 memcg: rename con... |
766 |
config MEMCG_SWAP_ENABLED |
a0166ec4b cgroup: clean up ... |
767 |
bool "Swap controller enabled by default" |
c255a4580 memcg: rename con... |
768 |
depends on MEMCG_SWAP |
a42c390cf cgroups: make swa... |
769 770 771 772 |
default y help Memory Resource Controller Swap Extension comes with its price in a bigger memory consumption. General purpose distribution kernels |
43d547f9c init/Kconfig: fix... |
773 |
which want to enable the feature but keep it disabled by default |
07555ac14 memcg: get rid of... |
774 |
and let the user enable it by swapaccount=1 boot command line |
a42c390cf cgroups: make swa... |
775 776 777 |
parameter should have this option unselected. For those who want to have the feature enabled by default should select this option (if, for some reason, they need to disable it |
00a66d297 mm: remove the le... |
778 |
then swapaccount=0 does the trick). |
c077719be memcg: mem+swap c... |
779 |
|
84c07d11a mm: introduce CON... |
780 781 782 783 |
config MEMCG_KMEM bool depends on MEMCG && !SLOB default y |
6bf024e69 cgroup: put contr... |
784 785 786 |
config BLK_CGROUP bool "IO controller" depends on BLOCK |
2bc64a204 mm/hugetlb: add n... |
787 |
default n |
6bf024e69 cgroup: put contr... |
788 789 790 791 |
---help--- Generic block IO controller cgroup interface. This is the common cgroup interface which should be used by various IO controlling policies. |
2bc64a204 mm/hugetlb: add n... |
792 |
|
6bf024e69 cgroup: put contr... |
793 794 795 796 |
Currently, CFQ IO scheduler uses it to recognize task groups and control disk bandwidth allocation (proportional time slice allocation) to such task groups. It is also used by bio throttling logic in block layer to implement upper limit in IO rates on a device. |
e5d1367f1 perf: Add cgroup ... |
797 |
|
6bf024e69 cgroup: put contr... |
798 799 800 801 802 |
This option only enables generic Block IO controller infrastructure. One needs to also enable actual IO controlling logic/policy. For enabling proportional weight division of disk bandwidth in CFQ, set CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set CONFIG_BLK_DEV_THROTTLING=y. |
da82c92f1 docs: cgroup-v1: ... |
803 |
See Documentation/admin-guide/cgroup-v1/blkio-controller.rst for more information. |
6bf024e69 cgroup: put contr... |
804 |
|
6bf024e69 cgroup: put contr... |
805 806 807 808 |
config CGROUP_WRITEBACK bool depends on MEMCG && BLK_CGROUP default y |
e5d1367f1 perf: Add cgroup ... |
809 |
|
7c9414385 sched: Remove USE... |
810 |
menuconfig CGROUP_SCHED |
a0166ec4b cgroup: clean up ... |
811 |
bool "CPU controller" |
7c9414385 sched: Remove USE... |
812 813 814 815 816 817 818 819 820 821 822 |
default n help This feature lets CPU scheduler recognize task groups and control CPU bandwidth allocation to such task groups. It uses cgroups to group tasks. if CGROUP_SCHED config FAIR_GROUP_SCHED bool "Group scheduling for SCHED_OTHER" depends on CGROUP_SCHED default CGROUP_SCHED |
ab84d31e1 sched: Introduce ... |
823 824 |
config CFS_BANDWIDTH bool "CPU bandwidth provisioning for FAIR_GROUP_SCHED" |
ab84d31e1 sched: Introduce ... |
825 826 827 828 829 830 831 |
depends on FAIR_GROUP_SCHED default n help This option allows users to define CPU bandwidth rates (limits) for tasks running within the fair group scheduler. Groups with no limit set are considered to be unconstrained and will run with no restriction. |
d6a3b2476 docs: scheduler: ... |
832 |
See Documentation/scheduler/sched-bwc.rst for more information. |
ab84d31e1 sched: Introduce ... |
833 |
|
7c9414385 sched: Remove USE... |
834 835 |
config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" |
7c9414385 sched: Remove USE... |
836 837 838 839 |
depends on CGROUP_SCHED default n help This feature lets you explicitly allocate real CPU bandwidth |
32bd7eb5a sched: Remove rem... |
840 |
to task groups. If enabled, it will also make it impossible to |
7c9414385 sched: Remove USE... |
841 842 |
schedule realtime tasks for non-root users until you allocate realtime bandwidth for them. |
d6a3b2476 docs: scheduler: ... |
843 |
See Documentation/scheduler/sched-rt-group.rst for more information. |
7c9414385 sched: Remove USE... |
844 845 |
endif #CGROUP_SCHED |
2480c0931 sched/uclamp: Ext... |
846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
config UCLAMP_TASK_GROUP bool "Utilization clamping per group of tasks" depends on CGROUP_SCHED depends on UCLAMP_TASK default n help This feature enables the scheduler to track the clamped utilization of each CPU based on RUNNABLE tasks currently scheduled on that CPU. When this option is enabled, the user can specify a min and max CPU bandwidth which is allowed for each single task in a group. The max bandwidth allows to clamp the maximum frequency a task can use, while the min bandwidth allows to define a minimum frequency a task will always use. When task group based utilization clamping is enabled, an eventually specified task-specific clamp value is constrained by the cgroup specified clamp value. Both minimum and maximum task clamping cannot be bigger than the corresponding clamping defined at task group level. If in doubt, say N. |
6bf024e69 cgroup: put contr... |
867 868 869 870 871 872 873 874 875 |
config CGROUP_PIDS bool "PIDs controller" help Provides enforcement of process number limits in the scope of a cgroup. Any attempt to fork more processes than is allowed in the cgroup will fail. PIDs are fundamentally a global resource because it is fairly trivial to reach PID exhaustion before you reach even a conservative kmemcg limit. As a result, it is possible to grind a system to halt without being limited by other cgroup policies. The |
6cc578df4 cgroup: Trivial c... |
876 |
PIDs controller is designed to stop this from happening. |
6bf024e69 cgroup: put contr... |
877 878 |
It should be noted that organisational operations (such as attaching |
980768338 init/Kconfig: fix... |
879 |
to a cgroup hierarchy) will *not* be blocked by the PIDs controller, |
6bf024e69 cgroup: put contr... |
880 881 |
since the PIDs limit only affects a process's ability to fork, not to attach to a cgroup. |
39d3e7584 rdmacg: Added rdm... |
882 883 884 885 886 887 888 889 890 |
config CGROUP_RDMA bool "RDMA controller" help Provides enforcement of RDMA resources defined by IB stack. It is fairly easy for consumers to exhaust RDMA resources, which can result into resource unavailability to other consumers. RDMA controller is designed to stop this from happening. Attaching processes with active RDMA resources to the cgroup hierarchy is allowed even if can cross the hierarchy's limit. |
6bf024e69 cgroup: put contr... |
891 892 893 894 895 |
config CGROUP_FREEZER bool "Freezer controller" help Provides a way to freeze and unfreeze all tasks in a cgroup. |
489c2a20a mm: memcontrol: i... |
896 897 898 899 |
This option affects the ORIGINAL cgroup interface. The cgroup2 memory controller includes important in-kernel memory consumers per default. If you're using cgroup2, say N. |
6bf024e69 cgroup: put contr... |
900 901 902 903 |
config CGROUP_HUGETLB bool "HugeTLB controller" depends on HUGETLB_PAGE select PAGE_COUNTER |
afc24d49c blk-cgroup: confi... |
904 |
default n |
6bf024e69 cgroup: put contr... |
905 906 907 908 909 910 911 912 913 914 |
help Provides a cgroup controller for HugeTLB pages. When you enable this, you can put a per cgroup limit on HugeTLB usage. The limit is enforced during page fault. Since HugeTLB doesn't support page reclaim, enforcing the limit at page fault time implies that, the application will get SIGBUS signal if it tries to access HugeTLB pages beyond its limit. This requires the application to know beforehand how much HugeTLB pages it would require for its use. The control group is tracked in the third page lru pointer. This means that we cannot use the controller with huge page less than 3 pages. |
afc24d49c blk-cgroup: confi... |
915 |
|
6bf024e69 cgroup: put contr... |
916 917 |
config CPUSETS bool "Cpuset controller" |
e1d4eeec5 sched/cpuset: Onl... |
918 |
depends on SMP |
6bf024e69 cgroup: put contr... |
919 920 921 922 923 |
help This option will let you create and manage CPUSETs which allow dynamically partitioning a system into sets of CPUs and Memory Nodes and assigning tasks to run only within those sets. This is primarily useful on large SMP or NUMA systems. |
afc24d49c blk-cgroup: confi... |
924 |
|
6bf024e69 cgroup: put contr... |
925 |
Say N if unsure. |
afc24d49c blk-cgroup: confi... |
926 |
|
6bf024e69 cgroup: put contr... |
927 928 929 930 |
config PROC_PID_CPUSET bool "Include legacy /proc/<pid>/cpuset file" depends on CPUSETS default y |
afc24d49c blk-cgroup: confi... |
931 |
|
6bf024e69 cgroup: put contr... |
932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 |
config CGROUP_DEVICE bool "Device controller" help Provides a cgroup controller implementing whitelists for devices which a process in the cgroup can mknod or open. config CGROUP_CPUACCT bool "Simple CPU accounting controller" help Provides a simple controller for monitoring the total CPU consumed by the tasks in a cgroup. config CGROUP_PERF bool "Perf controller" depends on PERF_EVENTS help This option extends the perf per-cpu mode to restrict monitoring to threads which belong to the cgroup specified and run on the designated cpu. Say N if unsure. |
300709849 cgroup: add suppo... |
953 954 |
config CGROUP_BPF bool "Support for eBPF programs attached to cgroups" |
483c4933e cgroup: Fix CGROU... |
955 956 |
depends on BPF_SYSCALL select SOCK_CGROUP_DATA |
300709849 cgroup: add suppo... |
957 958 959 960 961 962 963 964 |
help Allow attaching eBPF programs to a cgroup using the bpf(2) syscall command BPF_PROG_ATTACH. In which context these programs are accessed depends on the type of attachment. For instance, programs that are attached using BPF_CGROUP_INET_INGRESS will be executed on the ingress path of inet sockets. |
6bf024e69 cgroup: put contr... |
965 |
config CGROUP_DEBUG |
23b0be480 cgroup: Make Kcon... |
966 |
bool "Debug controller" |
afc24d49c blk-cgroup: confi... |
967 |
default n |
23b0be480 cgroup: Make Kcon... |
968 |
depends on DEBUG_KERNEL |
6bf024e69 cgroup: put contr... |
969 970 |
help This option enables a simple controller that exports |
23b0be480 cgroup: Make Kcon... |
971 972 973 |
debugging information about the cgroups framework. This controller is for control cgroup debugging only. Its interfaces are not stable. |
afc24d49c blk-cgroup: confi... |
974 |
|
6bf024e69 cgroup: put contr... |
975 |
Say N. |
89e9b9e07 writeback: add {C... |
976 |
|
73b351473 cgroup: move CONF... |
977 978 979 |
config SOCK_CGROUP_DATA bool default n |
23964d2d0 cgroups: clean up... |
980 |
endif # CGROUPS |
c077719be memcg: mem+swap c... |
981 |
|
8dd2a82c2 namespaces Kconfi... |
982 |
menuconfig NAMESPACES |
6a108a14f kconfig: rename C... |
983 |
bool "Namespaces support" if EXPERT |
2813893f8 kernel: condition... |
984 |
depends on MULTIUSER |
6a108a14f kconfig: rename C... |
985 |
default !EXPERT |
c5289a694 namespaces: add t... |
986 987 988 989 990 |
help Provides the way to make tasks work with different objects using the same id. For example same IPC id may refer to different objects or same user id or pid may refer to different tasks when used in different namespaces. |
8dd2a82c2 namespaces Kconfi... |
991 |
if NAMESPACES |
58bfdd6de namespaces: move ... |
992 993 |
config UTS_NS bool "UTS namespace" |
17a6d4411 namespaces: defau... |
994 |
default y |
58bfdd6de namespaces: move ... |
995 996 997 |
help In this namespace tasks see different info provided with the uname() system call |
ae5e1b22f namespaces: move ... |
998 999 |
config IPC_NS bool "IPC namespace" |
8dd2a82c2 namespaces Kconfi... |
1000 |
depends on (SYSVIPC || POSIX_MQUEUE) |
17a6d4411 namespaces: defau... |
1001 |
default y |
ae5e1b22f namespaces: move ... |
1002 1003 |
help In this namespace tasks work with IPC ids which correspond to |
614b84cf4 namespaces: mqueu... |
1004 |
different IPC objects in different namespaces. |
ae5e1b22f namespaces: move ... |
1005 |
|
aee16ce73 namespaces: clean... |
1006 |
config USER_NS |
19c923998 init: remove depe... |
1007 |
bool "User namespace" |
5673a94c1 userns: Add a Kco... |
1008 |
default n |
aee16ce73 namespaces: clean... |
1009 1010 1011 |
help This allows containers, i.e. vservers, to use user namespaces to provide different user info for different servers. |
e11f0ae38 userns: Recommend... |
1012 1013 |
When user namespaces are enabled in the kernel it is |
d886f4e48 mm: memcontrol: r... |
1014 1015 1016 |
recommended that the MEMCG option also be enabled and that user-space use the memory control groups to limit the amount of memory a memory unprivileged users can use. |
e11f0ae38 userns: Recommend... |
1017 |
|
aee16ce73 namespaces: clean... |
1018 |
If unsure, say N. |
74bd59bb3 namespaces: clean... |
1019 |
config PID_NS |
9bd38c2cd namespaces: remov... |
1020 |
bool "PID Namespaces" |
17a6d4411 namespaces: defau... |
1021 |
default y |
74bd59bb3 namespaces: clean... |
1022 |
help |
12d2b8f95 kconfig: fix typo... |
1023 |
Support process id namespaces. This allows having multiple |
692105b8a trivial: fix typo... |
1024 |
processes with the same pid as long as they are in different |
74bd59bb3 namespaces: clean... |
1025 |
pid namespaces. This is a building block of containers. |
d6eb633fe net: Move config ... |
1026 1027 |
config NET_NS bool "Network namespace" |
8dd2a82c2 namespaces Kconfi... |
1028 |
depends on NET |
17a6d4411 namespaces: defau... |
1029 |
default y |
d6eb633fe net: Move config ... |
1030 1031 1032 |
help Allow user space to create what appear to be multiple instances of the network stack. |
8dd2a82c2 namespaces Kconfi... |
1033 |
endif # NAMESPACES |
5cb366bb3 init/Kconfig: rem... |
1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 |
config CHECKPOINT_RESTORE bool "Checkpoint/restore support" select PROC_CHILDREN default n help Enables additional kernel features in a sake of checkpoint/restore. In particular it adds auxiliary prctl codes to setup process text, data and heap segment sizes, and a few additional /proc filesystem entries. If unsure, say N here. |
5091faa44 sched: Add 'autog... |
1045 1046 |
config SCHED_AUTOGROUP bool "Automatic process group scheduling" |
5091faa44 sched: Add 'autog... |
1047 1048 1049 1050 1051 1052 1053 1054 1055 |
select CGROUPS select CGROUP_SCHED select FAIR_GROUP_SCHED help This option optimizes the scheduler for common desktop workloads by automatically creating and populating task groups. This separation of workloads isolates aggressive CPU burners (like build jobs) from desktop applications. Task group autogeneration is currently based upon task session. |
7af37bec4 namespaces Kconfi... |
1056 |
config SYSFS_DEPRECATED |
5d6a4ea57 sysfs: Capitalize... |
1057 |
bool "Enable deprecated sysfs features to support old userspace tools" |
7af37bec4 namespaces Kconfi... |
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 |
depends on SYSFS default n help This option adds code that switches the layout of the "block" class devices, to not show up in /sys/class/block/, but only in /sys/block/. This switch is only active when the sysfs.deprecated=1 boot option is passed or the SYSFS_DEPRECATED_V2 option is set. This option allows new kernels to run on old distributions and tools, which might get confused by /sys/class/block/. Since 2007/2008 all major distributions and tools handle this just fine. Recent distributions and userspace tools after 2009/2010 depend on the existence of /sys/class/block/, and will not work with this option enabled. Only if you are using a new kernel on an old distribution, you might need to say Y here. config SYSFS_DEPRECATED_V2 |
5d6a4ea57 sysfs: Capitalize... |
1080 |
bool "Enable deprecated sysfs features by default" |
7af37bec4 namespaces Kconfi... |
1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 |
default n depends on SYSFS depends on SYSFS_DEPRECATED help Enable deprecated sysfs by default. See the CONFIG_SYSFS_DEPRECATED option for more details about this option. Only if you are using a new kernel on an old distribution, you might need to say Y here. Even then, odds are you would not need it enabled, you can always pass the boot option if absolutely necessary. config RELAY bool "Kernel->user space relay support (formerly relayfs)" |
26b5679e4 relay: Use irq_wo... |
1096 |
select IRQ_WORK |
7af37bec4 namespaces Kconfi... |
1097 1098 1099 1100 1101 1102 1103 1104 |
help This option enables support for relay interface support in certain file systems (such as debugfs). It is designed to provide an efficient mechanism for tools and facilities to relay large amounts of data from kernel space to user space. If unsure, say N. |
f991633de [PATCH] initramfs... |
1105 1106 |
config BLK_DEV_INITRD bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" |
f991633de [PATCH] initramfs... |
1107 1108 1109 1110 1111 |
help The initial RAM filesystem is a ramfs which is loaded by the boot loader (loadlin or lilo) and that is mounted as root before the normal boot procedure. It is typically used to load modules needed to mount the "real" root file system, |
8c27ceff3 docs: fix locatio... |
1112 |
etc. See <file:Documentation/admin-guide/initrd.rst> for details. |
f991633de [PATCH] initramfs... |
1113 1114 1115 1116 1117 1118 |
If RAM disk support (BLK_DEV_RAM) is also included, this also enables initial RAM disk (initrd) support and adds 15 Kbytes (more on some other architectures) to the kernel size. If unsure say Y. |
c33df4eaa [PATCH] disable i... |
1119 |
if BLK_DEV_INITRD |
dbec48663 kconfig: move ini... |
1120 |
source "usr/Kconfig" |
c33df4eaa [PATCH] disable i... |
1121 |
endif |
877417e6f Kbuild: change CC... |
1122 1123 |
choice prompt "Compiler optimization level" |
2cc3ce24a kbuild: Fix optim... |
1124 |
default CC_OPTIMIZE_FOR_PERFORMANCE |
877417e6f Kbuild: change CC... |
1125 1126 |
config CC_OPTIMIZE_FOR_PERFORMANCE |
15f5db60a kbuild,arc: add C... |
1127 |
bool "Optimize for performance (-O2)" |
877417e6f Kbuild: change CC... |
1128 1129 1130 1131 |
help This is the default optimization level for the kernel, building with the "-O2" compiler flag for best performance and most helpful compile-time warnings. |
15f5db60a kbuild,arc: add C... |
1132 1133 1134 |
config CC_OPTIMIZE_FOR_PERFORMANCE_O3 bool "Optimize more for performance (-O3)" depends on ARC |
b303c6df8 kbuild: compute f... |
1135 |
imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED # avoid false positives |
c45b4f1f1 Move size optimiz... |
1136 |
help |
15f5db60a kbuild,arc: add C... |
1137 1138 |
Choosing this option will pass "-O3" to your compiler to optimize the kernel yet more for performance. |
c45b4f1f1 Move size optimiz... |
1139 |
|
c45b4f1f1 Move size optimiz... |
1140 |
config CC_OPTIMIZE_FOR_SIZE |
15f5db60a kbuild,arc: add C... |
1141 |
bool "Optimize for size (-Os)" |
b303c6df8 kbuild: compute f... |
1142 |
imply CC_DISABLE_WARN_MAYBE_UNINITIALIZED # avoid false positives |
c45b4f1f1 Move size optimiz... |
1143 |
help |
ce3b487f6 init/Kconfig: rew... |
1144 1145 |
Choosing this option will pass "-Os" to your compiler resulting in a smaller kernel. |
c45b4f1f1 Move size optimiz... |
1146 |
|
877417e6f Kbuild: change CC... |
1147 |
endchoice |
5d20ee319 kbuild: Allow LD_... |
1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 |
config HAVE_LD_DEAD_CODE_DATA_ELIMINATION bool help This requires that the arch annotates or otherwise protects its external entry points from being discarded. Linker scripts must also merge .text.*, .data.*, and .bss.* correctly into output sections. Care must be taken not to pull in unrelated sections (e.g., '.text.init'). Typically '.' in section names is used to distinguish them from label names / C identifiers. config LD_DEAD_CODE_DATA_ELIMINATION bool "Dead code and data elimination (EXPERIMENTAL)" depends on HAVE_LD_DEAD_CODE_DATA_ELIMINATION depends on EXPERT |
16fd20aa9 kbuild: Disable L... |
1162 |
depends on !(FUNCTION_TRACER && CC_IS_GCC && GCC_VERSION < 40800) |
e85d1d65c kbuild: test dead... |
1163 1164 |
depends on $(cc-option,-ffunction-sections -fdata-sections) depends on $(ld-option,--gc-sections) |
5d20ee319 kbuild: Allow LD_... |
1165 |
help |
8b9d27124 kbuild: reword he... |
1166 1167 1168 |
Enable this if you want to do dead code and data elimination with the linker by compiling with -ffunction-sections -fdata-sections, and linking with --gc-sections. |
5d20ee319 kbuild: Allow LD_... |
1169 1170 1171 1172 1173 1174 1175 |
This can reduce on disk and in-memory size of the kernel code and static data, particularly for small configs and on small systems. This has the possibility of introducing silently broken kernel if the required annotations are not present. This option is not well tested yet, so use at your own risk. |
0847062ad [PATCH] fix EMBED... |
1176 1177 |
config SYSCTL bool |
657a52095 init/Kconfig: re-... |
1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 |
config HAVE_UID16 bool config SYSCTL_EXCEPTION_TRACE bool help Enable support for /proc/sys/debug/exception-trace. config SYSCTL_ARCH_UNALIGN_NO_WARN bool help Enable support for /proc/sys/kernel/ignore-unaligned-usertrap Allows arch to define/use @no_unaligned_warning to possibly warn about unaligned access emulation going on under the hood. config SYSCTL_ARCH_UNALIGN_ALLOW bool help Enable support for /proc/sys/kernel/unaligned-trap Allows arches to define/use @unaligned_enabled to runtime toggle the unaligned access emulation. see arch/parisc/kernel/unaligned.c for reference |
657a52095 init/Kconfig: re-... |
1200 1201 |
config HAVE_PCSPKR_PLATFORM bool |
f89b7755f bpf: split eBPF o... |
1202 1203 1204 |
# interpreter that classic socket filters depend on config BPF bool |
6a108a14f kconfig: rename C... |
1205 1206 |
menuconfig EXPERT bool "Configure standard kernel features (expert users)" |
f505c553d debug: Make CONFI... |
1207 1208 |
# Unhide debug options, to make the on-by-default options visible select DEBUG_KERNEL |
1da177e4c Linux-2.6.12-rc2 |
1209 1210 1211 1212 1213 |
help This option allows certain base kernel options and settings to be disabled or tweaked. This is for specialized environments which can tolerate a "non-standard" kernel. Only use this if you really know what you are doing. |
ae81f9e37 [PATCH] Kconfig: ... |
1214 |
config UID16 |
6a108a14f kconfig: rename C... |
1215 |
bool "Enable 16-bit UID system calls" if EXPERT |
2813893f8 kernel: condition... |
1216 |
depends on HAVE_UID16 && MULTIUSER |
ae81f9e37 [PATCH] Kconfig: ... |
1217 1218 1219 |
default y help This enables the legacy 16-bit UID syscall wrappers. |
2813893f8 kernel: condition... |
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 |
config MULTIUSER bool "Multiple users, groups and capabilities support" if EXPERT default y help This option enables support for non-root users, groups and capabilities. If you say N here, all processes will run with UID 0, GID 0, and all possible capabilities. Saying N here also compiles out support for system calls related to UIDs, GIDs, and capabilities, such as setuid, setgid, and capset. If unsure, say Y here. |
f6187769d sys_sgetmask/sys_... |
1233 1234 |
config SGETMASK_SYSCALL bool "sgetmask/ssetmask syscalls support" if EXPERT |
a687a5337 treewide: simplif... |
1235 |
def_bool PARISC || M68K || PPC || MIPS || X86 || SPARC || MICROBLAZE || SUPERH |
f6187769d sys_sgetmask/sys_... |
1236 1237 1238 1239 1240 1241 |
---help--- sys_sgetmask and sys_ssetmask are obsolete system calls no longer supported in libc but still enabled by default in some architectures. If unsure, leave the default option here. |
6af9f7bf3 sys_sysfs: Add CO... |
1242 1243 1244 1245 1246 1247 1248 1249 1250 |
config SYSFS_SYSCALL bool "Sysfs syscall support" if EXPERT default y ---help--- sys_sysfs is an obsolete system call no longer supported in libc. Note that disabling this option is more secure but might break compatibility with some systems. If unsure say Y here. |
b89a81712 [PATCH] sysctl: A... |
1251 |
config SYSCTL_SYSCALL |
6a108a14f kconfig: rename C... |
1252 |
bool "Sysctl syscall support" if EXPERT |
26a7034b4 sysctl: Reduce sy... |
1253 |
depends on PROC_SYSCTL |
c736de60a sysctl: make CONF... |
1254 |
default n |
b89a81712 [PATCH] sysctl: A... |
1255 |
select SYSCTL |
ae81f9e37 [PATCH] Kconfig: ... |
1256 |
---help--- |
13bb7e37e [PATCH] sysctl: U... |
1257 1258 1259 1260 |
sys_sysctl uses binary paths that have been found challenging to properly maintain and use. The interface in /proc/sys using paths with ascii names is now the primary path to this information. |
b89a81712 [PATCH] sysctl: A... |
1261 |
|
13bb7e37e [PATCH] sysctl: U... |
1262 1263 1264 |
Almost nothing using the binary sysctl interface so if you are trying to save some space it is probably safe to disable this, making your kernel marginally smaller. |
b89a81712 [PATCH] sysctl: A... |
1265 |
|
c736de60a sysctl: make CONF... |
1266 |
If unsure say N here. |
ae81f9e37 [PATCH] Kconfig: ... |
1267 |
|
d1b069f5f EXPERT Kconfig me... |
1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 |
config FHANDLE bool "open by fhandle syscalls" if EXPERT select EXPORTFS default y help If you say Y here, a user level program will be able to map file names to handle and then later use the handle for different file system operations. This is useful in implementing userspace file servers, which now track files using handles instead of names. The handle would remain the same even if file names get renamed. Enables open_by_handle_at(2) and name_to_handle_at(2) syscalls. |
baa73d9e4 posix-timers: Mak... |
1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 |
config POSIX_TIMERS bool "Posix Clocks & timers" if EXPERT default y help This includes native support for POSIX timers to the kernel. Some embedded systems have no use for them and therefore they can be configured out to reduce the size of the kernel image. When this option is disabled, the following syscalls won't be available: timer_create, timer_gettime: timer_getoverrun, timer_settime, timer_delete, clock_adjtime, getitimer, setitimer, alarm. Furthermore, the clock_settime, clock_gettime, clock_getres and clock_nanosleep syscalls will be limited to CLOCK_REALTIME, CLOCK_MONOTONIC and CLOCK_BOOTTIME only. If unsure say y. |
d59745ce3 [PATCH] clean up ... |
1296 1297 |
config PRINTK default y |
6a108a14f kconfig: rename C... |
1298 |
bool "Enable support for printk" if EXPERT |
74876a98a printk: Wake up k... |
1299 |
select IRQ_WORK |
d59745ce3 [PATCH] clean up ... |
1300 1301 1302 1303 1304 1305 |
help This option enables normal printk support. Removing it eliminates most of the message strings from the kernel image and makes the kernel more or less silent. As this makes it very difficult to diagnose system problems, saying N here is strongly discouraged. |
42a0bb3f7 printk/nmi: gener... |
1306 1307 1308 1309 |
config PRINTK_NMI def_bool y depends on PRINTK depends on HAVE_NMI |
c8538a7aa [PATCH] remove al... |
1310 |
config BUG |
6a108a14f kconfig: rename C... |
1311 |
bool "BUG() support" if EXPERT |
c8538a7aa [PATCH] remove al... |
1312 1313 1314 1315 1316 1317 1318 |
default y help Disabling this option eliminates support for BUG and WARN, reducing the size of your kernel image and potentially quietly ignoring numerous fatal conditions. You should only consider disabling this option for embedded systems with no facilities for reporting errors. Just say Y. |
708e9a794 [PATCH] tiny: Con... |
1319 |
config ELF_CORE |
046d662f4 coredump: make co... |
1320 |
depends on COREDUMP |
708e9a794 [PATCH] tiny: Con... |
1321 |
default y |
6a108a14f kconfig: rename C... |
1322 |
bool "Enable ELF core dumps" if EXPERT |
708e9a794 [PATCH] tiny: Con... |
1323 1324 |
help Enable support for generating core dumps. Disabling saves about 4k. |
8761f1ab7 pcspkr: Cleanup K... |
1325 |
|
e5e1d3cb2 pcspkr: fix depen... |
1326 |
config PCSPKR_PLATFORM |
6a108a14f kconfig: rename C... |
1327 |
bool "Enable PC-Speaker support" if EXPERT |
8761f1ab7 pcspkr: Cleanup K... |
1328 |
depends on HAVE_PCSPKR_PLATFORM |
15f304b66 i8253: Consolidat... |
1329 |
select I8253_LOCK |
e5e1d3cb2 pcspkr: fix depen... |
1330 1331 1332 1333 |
default y help This option allows to disable the internal PC-Speaker support, saving some memory. |
1da177e4c Linux-2.6.12-rc2 |
1334 1335 |
config BASE_FULL default y |
6a108a14f kconfig: rename C... |
1336 |
bool "Enable full-sized data structures for core" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
1337 1338 1339 1340 1341 1342 |
help Disabling this option reduces the size of miscellaneous core kernel data structures. This saves memory on small machines, but may reduce performance. config FUTEX |
6a108a14f kconfig: rename C... |
1343 |
bool "Enable futex support" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
1344 |
default y |
bc2eecd7e futex: Allow for ... |
1345 |
imply RT_MUTEXES |
1da177e4c Linux-2.6.12-rc2 |
1346 1347 1348 1349 |
help Disabling this option will cause the kernel to be built without support for "fast userspace mutexes". The resulting kernel may not run glibc-based applications correctly. |
bc2eecd7e futex: Allow for ... |
1350 1351 1352 1353 |
config FUTEX_PI bool depends on FUTEX && RT_MUTEXES default y |
03b8c7b62 futex: Allow arch... |
1354 1355 |
config HAVE_FUTEX_CMPXCHG bool |
62b4d2041 init/Kconfig: Fix... |
1356 |
depends on FUTEX |
03b8c7b62 futex: Allow arch... |
1357 1358 1359 1360 |
help Architectures should select this if futex_atomic_cmpxchg_inatomic() is implemented and always working. This removes a couple of runtime checks. |
1da177e4c Linux-2.6.12-rc2 |
1361 |
config EPOLL |
6a108a14f kconfig: rename C... |
1362 |
bool "Enable eventpoll support" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
1363 1364 1365 1366 |
default y help Disabling this option will cause the kernel to be built without support for epoll family of system calls. |
fba2afaae signal/timer/even... |
1367 |
config SIGNALFD |
6a108a14f kconfig: rename C... |
1368 |
bool "Enable signalfd() system call" if EXPERT |
fba2afaae signal/timer/even... |
1369 1370 1371 1372 1373 1374 |
default y help Enable the signalfd() system call that allows to receive signals on a file descriptor. If unsure, say Y. |
b215e2839 signal/timer/even... |
1375 |
config TIMERFD |
6a108a14f kconfig: rename C... |
1376 |
bool "Enable timerfd() system call" if EXPERT |
b215e2839 signal/timer/even... |
1377 1378 1379 1380 1381 1382 |
default y help Enable the timerfd() system call that allows to receive timer events on a file descriptor. If unsure, say Y. |
e1ad7468c signal/timer/even... |
1383 |
config EVENTFD |
6a108a14f kconfig: rename C... |
1384 |
bool "Enable eventfd() system call" if EXPERT |
e1ad7468c signal/timer/even... |
1385 1386 1387 1388 1389 1390 |
default y help Enable the eventfd() system call that allows to receive both kernel notification (ie. KAIO) or userspace notifications. If unsure, say Y. |
1da177e4c Linux-2.6.12-rc2 |
1391 |
config SHMEM |
6a108a14f kconfig: rename C... |
1392 |
bool "Use full shmem filesystem" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
1393 1394 1395 1396 1397 1398 1399 1400 |
default y depends on MMU help The shmem is an internal filesystem used to manage shared memory. It is backed by swap and manages resource limits. It is also exported to userspace as tmpfs if TMPFS is enabled. Disabling this option replaces shmem and tmpfs with the much simpler ramfs code, which may be appropriate on small systems without swap. |
ebf3f09c6 Configure out AIO... |
1401 |
config AIO |
6a108a14f kconfig: rename C... |
1402 |
bool "Enable AIO support" if EXPERT |
ebf3f09c6 Configure out AIO... |
1403 1404 1405 |
default y help This option enables POSIX asynchronous I/O which may by used |
657a52095 init/Kconfig: re-... |
1406 1407 |
by some high performance threaded applications. Disabling this option saves about 7k. |
2b188cc1b Add io_uring IO i... |
1408 1409 1410 1411 1412 1413 1414 1415 |
config IO_URING bool "Enable IO uring support" if EXPERT select ANON_INODES default y help This option enables support for the io_uring interface, enabling applications to submit and complete IO through submission and completion rings that are shared between the kernel and application. |
d3ac21cac mm: Support compi... |
1416 1417 1418 1419 1420 1421 1422 1423 1424 |
config ADVISE_SYSCALLS bool "Enable madvise/fadvise syscalls" if EXPERT default y help This option enables the madvise and fadvise syscalls, used by applications to advise the kernel about their future memory or file usage, improving performance. If building an embedded system where no applications use these syscalls, you can disable this option to save space. |
5b25b13ab sys_membarrier():... |
1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 |
config MEMBARRIER bool "Enable membarrier() system call" if EXPERT default y help Enable the membarrier() system call that allows issuing memory barriers across all running threads, which can be used to distribute the cost of user-space memory barriers asymmetrically by transforming pairs of memory barriers into pairs consisting of membarrier() and a compiler barrier. If unsure, say Y. |
d1b069f5f EXPERT Kconfig me... |
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 |
config KALLSYMS bool "Load all symbols for debugging/ksymoops" if EXPERT default y help Say Y here to let the kernel print out symbolic crash information and symbolic stack backtraces. This increases the size of the kernel somewhat, as all symbols have to be loaded into the kernel image. config KALLSYMS_ALL bool "Include all symbols in kallsyms" depends on DEBUG_KERNEL && KALLSYMS help Normally kallsyms only contains the symbols of functions for nicer OOPS messages and backtraces (i.e., symbols from the text and inittext sections). This is sufficient for most cases. And only in very rare cases (e.g., when a debugger is used) all symbols are required (e.g., names of variables from the data sections, etc). This option makes sure that all symbols are loaded into the kernel image (i.e., symbols from all sections) in cost of increased kernel size (depending on the kernel configuration, it may be 300KiB or something like this). Say N unless you really need all symbols. config KALLSYMS_ABSOLUTE_PERCPU bool depends on KALLSYMS default X86_64 && SMP config KALLSYMS_BASE_RELATIVE bool depends on KALLSYMS |
a687a5337 treewide: simplif... |
1469 |
default !IA64 |
d1b069f5f EXPERT Kconfig me... |
1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 |
help Instead of emitting them as absolute values in the native word size, emit the symbol references in the kallsyms table as 32-bit entries, each containing a relative value in the range [base, base + U32_MAX] or, when KALLSYMS_ABSOLUTE_PERCPU is in effect, each containing either an absolute value in the range [0, S32_MAX] or a relative value in the range [base, base + S32_MAX], where base is the lowest relative symbol address encountered in the image. On 64-bit builds, this reduces the size of the address table by 50%, but more importantly, it results in entries whose values are build time constants, and no relocation pass is required at runtime to fix up the entries based on the runtime load address of the kernel. # end of the "standard kernel features (expert users)" menu # syscall, maps, verifier config BPF_SYSCALL bool "Enable bpf() system call" |
d1b069f5f EXPERT Kconfig me... |
1489 |
select BPF |
bae77c5eb bpf: enable stack... |
1490 |
select IRQ_WORK |
d1b069f5f EXPERT Kconfig me... |
1491 1492 1493 1494 |
default n help Enable the bpf() system call that allows to manipulate eBPF programs and maps via file descriptors. |
290af8662 bpf: introduce BP... |
1495 1496 1497 1498 1499 1500 |
config BPF_JIT_ALWAYS_ON bool "Permanently enable BPF JIT and remove BPF interpreter" depends on BPF_SYSCALL && HAVE_EBPF_JIT && BPF_JIT help Enables BPF JIT and removes BPF interpreter to avoid speculative execution of BPF instructions by the interpreter |
d1b069f5f EXPERT Kconfig me... |
1501 1502 |
config USERFAULTFD bool "Enable userfaultfd() system call" |
d1b069f5f EXPERT Kconfig me... |
1503 1504 1505 1506 |
depends on MMU help Enable the userfaultfd() system call that allows to intercept and handle page faults in userland. |
3ccfebedd powerpc, membarri... |
1507 1508 |
config ARCH_HAS_MEMBARRIER_CALLBACKS bool |
70216e18e membarrier: Provi... |
1509 1510 |
config ARCH_HAS_MEMBARRIER_SYNC_CORE bool |
d7822b1e2 rseq: Introduce r... |
1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 |
config RSEQ bool "Enable rseq() system call" if EXPERT default y depends on HAVE_RSEQ select MEMBARRIER help Enable the restartable sequences system call. It provides a user-space cache for the current CPU number value, which speeds up getting the current CPU number from user-space, as well as an ABI to speed up user-space operations on per-CPU data. If unsure, say Y. config DEBUG_RSEQ default n bool "Enabled debugging of rseq() system call" if EXPERT depends on RSEQ && DEBUG_KERNEL help Enable extra debugging checks for the rseq system call. If unsure, say N. |
6befe5f69 init/Kconfig: fix... |
1533 1534 |
config EMBEDDED bool "Embedded system" |
5d2acfc7b kconfig: make all... |
1535 |
option allnoconfig_y |
6befe5f69 init/Kconfig: fix... |
1536 1537 1538 1539 1540 |
select EXPERT help This option should be enabled if compiling the kernel for an embedded system so certain expert options are available for configuration. |
cdd6c482c perf: Do the big ... |
1541 |
config HAVE_PERF_EVENTS |
0793a61d4 performance count... |
1542 |
bool |
018df72dd perf_counter: Sta... |
1543 1544 |
help See tools/perf/design.txt for details. |
0793a61d4 performance count... |
1545 |
|
906010b21 perf_event: Provi... |
1546 1547 1548 1549 |
config PERF_USE_VMALLOC bool help See tools/perf/design.txt for details |
ad90a3de9 pc104: Introduce ... |
1550 |
config PC104 |
424529fb7 pc104: Add EXPERT... |
1551 |
bool "PC/104 support" if EXPERT |
ad90a3de9 pc104: Introduce ... |
1552 1553 1554 1555 |
help Expose PC/104 form factor device drivers and options available for selection and configuration. Enable this option if your target machine has a PC/104 bus. |
57c0c15b5 perf: Tidy up aft... |
1556 |
menu "Kernel Performance Events And Counters" |
0793a61d4 performance count... |
1557 |
|
cdd6c482c perf: Do the big ... |
1558 |
config PERF_EVENTS |
57c0c15b5 perf: Tidy up aft... |
1559 |
bool "Kernel performance events and counters" |
392d65a9a perf: Remove PERF... |
1560 |
default y if PROFILING |
cdd6c482c perf: Do the big ... |
1561 |
depends on HAVE_PERF_EVENTS |
e360adbe2 irq_work: Add gen... |
1562 |
select IRQ_WORK |
83fe27ea5 rcu: Make SRCU op... |
1563 |
select SRCU |
0793a61d4 performance count... |
1564 |
help |
57c0c15b5 perf: Tidy up aft... |
1565 1566 |
Enable kernel support for various performance events provided by software and hardware. |
0793a61d4 performance count... |
1567 |
|
dd77038d2 perf_events: Fix ... |
1568 |
Software events are supported either built-in or via the |
57c0c15b5 perf: Tidy up aft... |
1569 |
use of generic tracepoints. |
0793a61d4 performance count... |
1570 |
|
57c0c15b5 perf: Tidy up aft... |
1571 1572 |
Most modern CPUs support performance events via performance counter registers. These registers count the number of certain |
0793a61d4 performance count... |
1573 1574 1575 1576 1577 |
types of hw events: such as instructions executed, cachemisses suffered, or branches mis-predicted - without slowing down the kernel or applications. These registers can also trigger interrupts when a threshold number of events have passed - and can thus be used to profile the code that runs on that CPU. |
57c0c15b5 perf: Tidy up aft... |
1578 |
The Linux Performance Event subsystem provides an abstraction of |
dd77038d2 perf_events: Fix ... |
1579 |
these software and hardware event capabilities, available via a |
57c0c15b5 perf: Tidy up aft... |
1580 |
system call and used by the "perf" utility in tools/perf/. It |
0793a61d4 performance count... |
1581 1582 1583 1584 |
provides per task and per CPU counters, and it provides event capabilities on top of those. Say Y if unsure. |
906010b21 perf_event: Provi... |
1585 1586 1587 |
config DEBUG_PERF_USE_VMALLOC default n bool "Debug: use vmalloc to back perf mmap() buffers" |
cb3071137 perf_event: Don't... |
1588 |
depends on PERF_EVENTS && DEBUG_KERNEL && !PPC |
906010b21 perf_event: Provi... |
1589 1590 1591 1592 1593 1594 1595 1596 |
select PERF_USE_VMALLOC help Use vmalloc memory to back perf mmap() buffers. Mostly useful for debugging the vmalloc code on platforms that don't require it. Say N if unsure. |
0793a61d4 performance count... |
1597 |
endmenu |
f8891e5e1 [PATCH] Light wei... |
1598 1599 |
config VM_EVENT_COUNTERS default y |
6a108a14f kconfig: rename C... |
1600 |
bool "Enable VM event counters for /proc/vmstat" if EXPERT |
f8891e5e1 [PATCH] Light wei... |
1601 |
help |
2aea4fb61 [PATCH] CONFIG_VM... |
1602 1603 |
VM event counters are needed for event counts to be shown. This option allows the disabling of the VM event counters |
6a108a14f kconfig: rename C... |
1604 |
on EXPERT systems. /proc/vmstat will only show page counts |
2aea4fb61 [PATCH] CONFIG_VM... |
1605 |
if VM event counters are disabled. |
f8891e5e1 [PATCH] Light wei... |
1606 |
|
41ecc55b8 SLUB: add CONFIG_... |
1607 1608 |
config SLUB_DEBUG default y |
6a108a14f kconfig: rename C... |
1609 |
bool "Enable SLUB debugging support" if EXPERT |
f6acb6350 slub: #ifdef simp... |
1610 |
depends on SLUB && SYSFS |
41ecc55b8 SLUB: add CONFIG_... |
1611 1612 1613 1614 1615 |
help SLUB has extensive debug support features. Disabling these can result in significant savings in code size. This also disables SLUB sysfs support. /sys/slab will not exist and there will be no support for cache validation etc. |
1663f26df slub: make sysfs ... |
1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 |
config SLUB_MEMCG_SYSFS_ON default n bool "Enable memcg SLUB sysfs support by default" if EXPERT depends on SLUB && SYSFS && MEMCG help SLUB creates a directory under /sys/kernel/slab for each allocation cache to host info and debug files. If memory cgroup is enabled, each cache can have per memory cgroup caches. SLUB can create the same sysfs directories for these caches under /sys/kernel/slab/CACHE/cgroup but it can lead to a very high number of debug files being created. This is controlled by slub_memcg_sysfs boot parameter and this config option determines the parameter's default value. |
b943c460f menu: fix embedde... |
1629 1630 1631 1632 1633 1634 1635 |
config COMPAT_BRK bool "Disable heap randomization" default y help Randomizing heap placement makes heap exploits harder, but it also breaks ancient binaries (including anything libc5 based). This option changes the bootup default to heap randomization |
692105b8a trivial: fix typo... |
1636 |
disabled, and can be overridden at runtime by setting |
b943c460f menu: fix embedde... |
1637 1638 1639 |
/proc/sys/kernel/randomize_va_space to 2. On non-ancient distros (post-2000 ones) N is usually a safe choice. |
81819f0fc SLUB core |
1640 1641 |
choice prompt "Choose SLAB allocator" |
a0acd8208 Make SLUB the def... |
1642 |
default SLUB |
81819f0fc SLUB core |
1643 1644 1645 1646 1647 |
help This option allows to select a slab allocator. config SLAB bool "SLAB" |
04385fc5e mm: SLAB hardened... |
1648 |
select HAVE_HARDENED_USERCOPY_ALLOCATOR |
81819f0fc SLUB core |
1649 1650 |
help The regular slab allocator that is established and known to work |
34013886e Fix spellings of ... |
1651 |
well in all environments. It organizes cache hot objects in |
02f562104 Kconfig: SLUB is ... |
1652 |
per cpu and per node queues. |
81819f0fc SLUB core |
1653 1654 |
config SLUB |
81819f0fc SLUB core |
1655 |
bool "SLUB (Unqueued Allocator)" |
ed18adc1c mm: SLUB hardened... |
1656 |
select HAVE_HARDENED_USERCOPY_ALLOCATOR |
81819f0fc SLUB core |
1657 1658 1659 1660 1661 |
help SLUB is a slab allocator that minimizes cache line usage instead of managing queues of cached objects (SLAB approach). Per cpu caching is realized using slabs of objects instead of queues of objects. SLUB can use memory efficiently |
02f562104 Kconfig: SLUB is ... |
1662 1663 |
and has enhanced diagnostics. SLUB is the default choice for a slab allocator. |
81819f0fc SLUB core |
1664 1665 |
config SLOB |
6a108a14f kconfig: rename C... |
1666 |
depends on EXPERT |
81819f0fc SLUB core |
1667 1668 |
bool "SLOB (Simple Allocator)" help |
372914582 slob: correct Kco... |
1669 1670 1671 |
SLOB replaces the stock allocator with a drastically simpler allocator. SLOB is generally more space efficient but does not perform as well on large systems. |
81819f0fc SLUB core |
1672 1673 |
endchoice |
7660a6fdd mm: allow slab_no... |
1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 |
config SLAB_MERGE_DEFAULT bool "Allow slab caches to be merged" default y help For reduced kernel memory fragmentation, slab caches can be merged when they share the same size and other characteristics. This carries a risk of kernel heap overflows being able to overwrite objects from merged caches (and more easily control cache layout), which makes such heap attacks easier to exploit by attackers. By keeping caches unmerged, these kinds of exploits can usually only damage objects in the same cache. To disable merging at runtime, "slab_nomerge" can be passed on the kernel command line. |
c7ce4f60a mm: SLAB freelist... |
1687 1688 |
config SLAB_FREELIST_RANDOM default n |
210e7a43f mm: SLUB freelist... |
1689 |
depends on SLAB || SLUB |
c7ce4f60a mm: SLAB freelist... |
1690 1691 |
bool "SLAB freelist randomization" help |
210e7a43f mm: SLUB freelist... |
1692 |
Randomizes the freelist order used on creating new pages. This |
c7ce4f60a mm: SLAB freelist... |
1693 1694 |
security feature reduces the predictability of the kernel slab allocator against heap overflows. |
2482ddec6 mm: add SLUB free... |
1695 1696 1697 1698 1699 1700 |
config SLAB_FREELIST_HARDENED bool "Harden slab freelist metadata" depends on SLUB help Many kernel heap attacks try to target slab cache metadata and other infrastructure. This options makes minor performance |
92bae787c init/Kconfig: fix... |
1701 |
sacrifices to harden the kernel slab allocator against common |
2482ddec6 mm: add SLUB free... |
1702 |
freelist exploit methods. |
e900a918b mm: shuffle initi... |
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 |
config SHUFFLE_PAGE_ALLOCATOR bool "Page allocator randomization" default SLAB_FREELIST_RANDOM && ACPI_NUMA help Randomization of the page allocator improves the average utilization of a direct-mapped memory-side-cache. See section 5.2.27 Heterogeneous Memory Attribute Table (HMAT) in the ACPI 6.2a specification for an example of how a platform advertises the presence of a memory-side-cache. There are also incidental security benefits as it reduces the predictability of page allocations to compliment SLAB_FREELIST_RANDOM, but the default granularity of shuffling on the "MAX_ORDER - 1" i.e, 10th order of pages is selected based on cache utilization benefits on x86. While the randomization improves cache utilization it may negatively impact workloads on platforms without a cache. For this reason, by default, the randomization is enabled only after runtime detection of a direct-mapped memory-side-cache. Otherwise, the randomization may be force enabled with the 'page_alloc.shuffle' kernel command line parameter. Say Y if unsure. |
345c905d1 slub: Make cpu pa... |
1726 1727 |
config SLUB_CPU_PARTIAL default y |
b39ffbf8b slub: don't use c... |
1728 |
depends on SLUB && SMP |
345c905d1 slub: Make cpu pa... |
1729 1730 |
bool "SLUB per cpu partial cache" help |
92bae787c init/Kconfig: fix... |
1731 |
Per cpu partial caches accelerate objects allocation and freeing |
345c905d1 slub: Make cpu pa... |
1732 1733 1734 1735 |
that is local to a processor at the price of more indeterminism in the latency of the free. On overflow these caches will be cleared which requires the taking of locks that may cause latency spikes. Typically one would choose no for a realtime system. |
ea6376395 nommu: fix malloc... |
1736 1737 |
config MMAP_ALLOW_UNINITIALIZED bool "Allow mmapped anonymous memory to be uninitialized" |
6a108a14f kconfig: rename C... |
1738 |
depends on EXPERT && !MMU |
ea6376395 nommu: fix malloc... |
1739 1740 1741 |
default n help Normally, and according to the Linux spec, anonymous memory obtained |
3903bf940 init/Kconfig: fix... |
1742 |
from mmap() has its contents cleared before it is passed to |
ea6376395 nommu: fix malloc... |
1743 1744 1745 1746 1747 1748 1749 1750 1751 1752 1753 1754 1755 1756 |
userspace. Enabling this config option allows you to request that mmap() skip that if it is given an MAP_UNINITIALIZED flag, thus providing a huge performance boost. If this option is not enabled, then the flag will be ignored. This is taken advantage of by uClibc's malloc(), and also by ELF-FDPIC binfmt's brk and stack allocator. Because of the obvious security issues, this option should only be enabled on embedded devices where you control what is run in userspace. Since that isn't generally a problem on no-MMU systems, it is normally safe to say Y here. See Documentation/nommu-mmap.txt for more information. |
091f6e26e MODSIGN: Extract ... |
1757 1758 1759 1760 1761 |
config SYSTEM_DATA_VERIFICATION def_bool n select SYSTEM_TRUSTED_KEYRING select KEYS select CRYPTO |
d43de6c78 akcipher: Move th... |
1762 |
select CRYPTO_RSA |
091f6e26e MODSIGN: Extract ... |
1763 1764 |
select ASYMMETRIC_KEY_TYPE select ASYMMETRIC_PUBLIC_KEY_SUBTYPE |
091f6e26e MODSIGN: Extract ... |
1765 1766 1767 1768 |
select ASN1 select OID_REGISTRY select X509_CERTIFICATE_PARSER select PKCS7_MESSAGE_PARSER |
82c04ff89 init/Kconfig: mov... |
1769 |
help |
091f6e26e MODSIGN: Extract ... |
1770 1771 1772 1773 |
Provide PKCS#7 message verification using the contents of the system trusted keyring to provide public keys. This then can be used for module verification, kexec image verification and firmware blob verification. |
82c04ff89 init/Kconfig: mov... |
1774 |
|
125e56458 Move Kconfig.inst... |
1775 |
config PROFILING |
b309a294e oprofile: remove ... |
1776 |
bool "Profiling support" |
125e56458 Move Kconfig.inst... |
1777 1778 1779 |
help Say Y here to enable the extended profiling support mechanisms used by profilers such as OProfile. |
5f87f1121 tracing: clean up... |
1780 1781 1782 1783 |
# # Place an empty function call at each tracepoint site. Can be # dynamically changed for a probe function. # |
97e1c18e8 tracing: Kernel T... |
1784 |
config TRACEPOINTS |
5f87f1121 tracing: clean up... |
1785 |
bool |
97e1c18e8 tracing: Kernel T... |
1786 |
|
1da177e4c Linux-2.6.12-rc2 |
1787 |
endmenu # General setup |
1572497cb kconfig: include ... |
1788 |
source "arch/Kconfig" |
ae81f9e37 [PATCH] Kconfig: ... |
1789 |
config RT_MUTEXES |
6341e62b2 kconfig: use bool... |
1790 |
bool |
ae81f9e37 [PATCH] Kconfig: ... |
1791 |
|
1da177e4c Linux-2.6.12-rc2 |
1792 1793 1794 1795 |
config BASE_SMALL int default 0 if BASE_FULL default 1 if !BASE_FULL |
c8424e776 MODSIGN: Export m... |
1796 1797 1798 |
config MODULE_SIG_FORMAT def_bool n select SYSTEM_DATA_VERIFICATION |
66da57332 Use menuconfig ob... |
1799 |
menuconfig MODULES |
1da177e4c Linux-2.6.12-rc2 |
1800 |
bool "Enable loadable module support" |
11097a036 modules: do not d... |
1801 |
option modules |
1da177e4c Linux-2.6.12-rc2 |
1802 1803 1804 1805 1806 1807 1808 1809 1810 1811 1812 1813 1814 1815 1816 1817 1818 |
help Kernel modules are small pieces of compiled code which can be inserted in the running kernel, rather than being permanently built into the kernel. You use the "modprobe" tool to add (and sometimes remove) them. If you say Y here, many parts of the kernel can be built as modules (by answering M instead of Y where indicated): this is most useful for infrequently used options which are not required for booting. For more information, see the man pages for modprobe, lsmod, modinfo, insmod and rmmod. If you say Y here, you will need to run "make modules_install" to put the modules under /lib/modules/ where modprobe can find them (you may need to be root to do this). If unsure, say Y. |
0b0de1443 Kconfig: Extend "... |
1819 |
if MODULES |
826e4506a Make forced modul... |
1820 1821 |
config MODULE_FORCE_LOAD bool "Forced module loading" |
826e4506a Make forced modul... |
1822 1823 |
default n help |
91e37a793 module: don't ign... |
1824 1825 1826 |
Allow loading of modules without version information (ie. modprobe --force). Forced module loading sets the 'F' (forced) taint flag and is usually a really bad idea. |
826e4506a Make forced modul... |
1827 |
|
1da177e4c Linux-2.6.12-rc2 |
1828 1829 |
config MODULE_UNLOAD bool "Module unloading" |
1da177e4c Linux-2.6.12-rc2 |
1830 1831 1832 |
help Without this option you will not be able to unload any modules (note that some modules may not be unloadable |
f7f5b6755 Shrink struct mod... |
1833 1834 |
anyway), which makes your kernel smaller, faster and simpler. If unsure, say Y. |
1da177e4c Linux-2.6.12-rc2 |
1835 1836 1837 |
config MODULE_FORCE_UNLOAD bool "Forced module unloading" |
19c923998 init: remove depe... |
1838 |
depends on MODULE_UNLOAD |
1da177e4c Linux-2.6.12-rc2 |
1839 1840 1841 1842 1843 1844 |
help This option allows you to force a module to unload, even if the kernel believes it is unsafe: the kernel will remove the module without waiting for anyone to stop using it (using the -f option to rmmod). This is mainly for kernel developers and desperate users. If unsure, say N. |
1da177e4c Linux-2.6.12-rc2 |
1845 |
config MODVERSIONS |
0d5416433 kbuild: remove EX... |
1846 |
bool "Module versioning support" |
1da177e4c Linux-2.6.12-rc2 |
1847 1848 1849 1850 1851 1852 1853 |
help Usually, you have to use modules compiled with your kernel. Saying Y here makes it sometimes possible to use modules compiled for different kernels, by adding enough information to the modules to (hopefully) spot any changes which would make them incompatible with the kernel you are running. If unsure, say N. |
2ff2b7ec6 kbuild: add CONFI... |
1854 1855 1856 1857 1858 1859 1860 |
config ASM_MODVERSIONS bool default HAVE_ASM_MODVERSIONS && MODVERSIONS help This enables module versioning for exported symbols also from assembly. This can be enabled only when the target architecture supports it. |
56067812d kbuild: modversio... |
1861 1862 1863 |
config MODULE_REL_CRCS bool depends on MODVERSIONS |
1da177e4c Linux-2.6.12-rc2 |
1864 1865 |
config MODULE_SRCVERSION_ALL bool "Source checksum for all modules" |
1da177e4c Linux-2.6.12-rc2 |
1866 1867 1868 1869 1870 1871 1872 1873 |
help Modules which contain a MODULE_VERSION get an extra "srcversion" field inserted into their modinfo section, which contains a sum of the source files which made it. This helps maintainers see exactly which source was used to build a module (since others sometimes change the module source without updating the version). With this option, such a "srcversion" field will be created for all modules. If unsure, say N. |
106a4ee25 module: signature... |
1874 1875 |
config MODULE_SIG bool "Module signature verification" |
c8424e776 MODSIGN: Export m... |
1876 |
select MODULE_SIG_FORMAT |
106a4ee25 module: signature... |
1877 1878 1879 |
help Check modules for valid signatures upon load: the signature is simply appended to the module. For more information see |
cbdc82170 init/Kconfig: Fix... |
1880 |
<file:Documentation/admin-guide/module-signing.rst>. |
106a4ee25 module: signature... |
1881 |
|
228c37ff9 sign-file: Docume... |
1882 1883 1884 |
Note that this option adds the OpenSSL development packages as a kernel build dependency so that the signing tool can use its crypto library. |
49fcf732b lockdown: Enforce... |
1885 1886 1887 1888 |
You should enable this option if you wish to use either CONFIG_SECURITY_LOCKDOWN_LSM or lockdown functionality imposed via another LSM - otherwise unsigned modules will be loadable regardless of the lockdown policy. |
ea0b6dcf7 MODSIGN: Provide ... |
1889 1890 1891 1892 |
!!!WARNING!!! If you enable this option, you MUST make sure that the module DOES NOT get stripped after being signed. This includes the debuginfo strip done by some packagers (such as rpmbuild) and inclusion into an initramfs that wants the module size reduced. |
106a4ee25 module: signature... |
1893 1894 1895 1896 1897 1898 |
config MODULE_SIG_FORCE bool "Require modules to be validly signed" depends on MODULE_SIG help Reject unsigned modules or signed modules for which we don't have a key. Without this, such modules will simply taint the kernel. |
ea0b6dcf7 MODSIGN: Provide ... |
1899 |
|
d9d8d7ed4 MODSIGN: Add opti... |
1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 |
config MODULE_SIG_ALL bool "Automatically sign all modules" default y depends on MODULE_SIG help Sign all modules during make modules_install. Without this option, modules must be signed manually, using the scripts/sign-file tool. comment "Do not forget to sign required modules with scripts/sign-file" depends on MODULE_SIG_FORCE && !MODULE_SIG_ALL |
ea0b6dcf7 MODSIGN: Provide ... |
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choice prompt "Which hash algorithm should modules be signed with?" depends on MODULE_SIG help This determines which sort of hashing algorithm will be used during signature generation. This algorithm _must_ be built into the kernel directly so that signature verification can take place. It is not possible to load a signed module containing the algorithm to check the signature on that module. config MODULE_SIG_SHA1 bool "Sign modules with SHA-1" select CRYPTO_SHA1 config MODULE_SIG_SHA224 bool "Sign modules with SHA-224" select CRYPTO_SHA256 config MODULE_SIG_SHA256 bool "Sign modules with SHA-256" select CRYPTO_SHA256 config MODULE_SIG_SHA384 bool "Sign modules with SHA-384" select CRYPTO_SHA512 config MODULE_SIG_SHA512 bool "Sign modules with SHA-512" select CRYPTO_SHA512 endchoice |
227536740 MODSIGN: Simplify... |
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config MODULE_SIG_HASH string depends on MODULE_SIG default "sha1" if MODULE_SIG_SHA1 default "sha224" if MODULE_SIG_SHA224 default "sha256" if MODULE_SIG_SHA256 default "sha384" if MODULE_SIG_SHA384 default "sha512" if MODULE_SIG_SHA512 |
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config MODULE_COMPRESS bool "Compress modules on installation" |
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help |
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Compresses kernel modules when 'make modules_install' is run; gzip or xz depending on "Compression algorithm" below. |
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module-init-tools MAY support gzip, and kmod MAY support gzip and xz. |
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Out-of-tree kernel modules installed using Kbuild will also be compressed upon installation. |
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Note: for modules inside an initrd or initramfs, it's more efficient to compress the whole initrd or initramfs instead. |
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Note: This is fully compatible with signed modules. If in doubt, say N. |
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choice prompt "Compression algorithm" depends on MODULE_COMPRESS default MODULE_COMPRESS_GZIP help This determines which sort of compression will be used during 'make modules_install'. GZIP (default) and XZ are supported. config MODULE_COMPRESS_GZIP bool "GZIP" config MODULE_COMPRESS_XZ bool "XZ" endchoice |
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config MODULE_ALLOW_MISSING_NAMESPACE_IMPORTS bool "Allow loading of modules with missing namespace imports" help Symbols exported with EXPORT_SYMBOL_NS*() are considered exported in a namespace. A module that makes use of a symbol exported with such a namespace is required to import the namespace via MODULE_IMPORT_NS(). There is no technical reason to enforce correct namespace imports, but it creates consistency between symbols defining namespaces and users importing namespaces they make use of. This option relaxes this requirement and lifts the enforcement when loading a module. If unsure, say N. |
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config UNUSED_SYMBOLS bool "Enable unused/obsolete exported symbols" default y if X86 help Unused but exported symbols make the kernel needlessly bigger. For that reason most of these unused exports will soon be removed. This option is provided temporarily to provide a transition period in case some external kernel module needs one of these symbols anyway. If you encounter such a case in your module, consider if you are actually using the right API. (rationale: since nobody in the kernel is using this in a module, there is a pretty good chance it's actually the wrong interface to use). If you really need the symbol, please send a mail to the linux kernel mailing list mentioning the symbol and why you really need it, and what the merge plan to the mainline kernel for your module is. |
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config TRIM_UNUSED_KSYMS bool "Trim unused exported kernel symbols" |
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depends on !UNUSED_SYMBOLS |
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help The kernel and some modules make many symbols available for other modules to use via EXPORT_SYMBOL() and variants. Depending on the set of modules being selected in your kernel configuration, many of those exported symbols might never be used. This option allows for unused exported symbols to be dropped from the build. In turn, this provides the compiler more opportunities (especially when using LTO) for optimizing the code and reducing binary size. This might have some security advantages as well. |
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If unsure, or if you need to build out-of-tree modules, say N. |
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0b0de1443 Kconfig: Extend "... |
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endif # MODULES |
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config MODULES_TREE_LOOKUP def_bool y depends on PERF_EVENTS || TRACING |
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config INIT_ALL_POSSIBLE bool help |
5f054e31c documentation: re... |
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Back when each arch used to define their own cpu_online_mask and cpu_possible_mask, some of them chose to initialize cpu_possible_mask |
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with all 1s, and others with all 0s. When they were centralised, it was better to provide this option than to break all the archs |
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and have several arch maintainers pursuing me down dark alleys. |
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3a65dfe8c [BLOCK] Move all ... |
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source "block/Kconfig" |
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config PREEMPT_NOTIFIERS bool |
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config PADATA depends on SMP bool |
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config ASN1 tristate help Build a simple ASN.1 grammar compiler that produces a bytecode output that can be interpreted by the ASN.1 stream decoder and used to inform it as to what tags are to be expected in a stream and what functions to call on what tags. |
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source "kernel/Kconfig.locks" |
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config ARCH_HAS_SYNC_CORE_BEFORE_USERMODE bool |
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# It may be useful for an architecture to override the definitions of the |
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# SYSCALL_DEFINE() and __SYSCALL_DEFINEx() macros in <linux/syscalls.h> # and the COMPAT_ variants in <linux/compat.h>, in particular to use a # different calling convention for syscalls. They can also override the # macros for not-implemented syscalls in kernel/sys_ni.c and # kernel/time/posix-stubs.c. All these overrides need to be available in # <asm/syscall_wrapper.h>. |
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config ARCH_HAS_SYSCALL_WRAPPER def_bool n |