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init/Kconfig
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config ARCH string option env="ARCH" config KERNELVERSION string option env="KERNELVERSION" |
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config DEFCONFIG_LIST string |
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depends on !UML |
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option defconfig_list default "/lib/modules/$UNAME_RELEASE/.config" default "/etc/kernel-config" default "/boot/config-$UNAME_RELEASE" |
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default "$ARCH_DEFCONFIG" |
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default "arch/$ARCH/defconfig" |
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config CONSTRUCTORS bool depends on !UML |
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config HAVE_IRQ_WORK bool config IRQ_WORK bool depends on HAVE_IRQ_WORK |
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menu "General setup" |
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config EXPERIMENTAL bool "Prompt for development and/or incomplete code/drivers" ---help--- Some of the various things that Linux supports (such as network drivers, file systems, network protocols, etc.) can be in a state of development where the functionality, stability, or the level of testing is not yet high enough for general use. This is usually known as the "alpha-test" phase among developers. If a feature is currently in alpha-test, then the developers usually discourage uninformed widespread use of this feature by the general public to avoid "Why doesn't this work?" type mail messages. However, active testing and use of these systems is welcomed. Just be aware that it may not meet the normal level of reliability or it may fail to work in some special cases. Detailed bug reports from people familiar with the kernel internals are usually welcomed by the developers (before submitting bug reports, please read the documents <file:README>, <file:MAINTAINERS>, <file:REPORTING-BUGS>, <file:Documentation/BUG-HUNTING>, and <file:Documentation/oops-tracing.txt> in the kernel source). This option will also make obsoleted drivers available. These are drivers that have been replaced by something else, and/or are scheduled to be removed in a future kernel release. Unless you intend to help test and develop a feature or driver that falls into this category, or you have a situation that requires using these features, you should probably say N here, which will cause the configurator to present you with fewer choices. If you say Y here, you will be offered the choice of using features or drivers that are currently considered to be in the alpha-test phase. |
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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 CROSS_COMPILE string "Cross-compiler tool prefix" help Same as running 'make CROSS_COMPILE=prefix-' but stored for default make runs in this kernel build directory. You don't need to set this unless you want the configured kernel build directory to select the cross-compiler automatically. |
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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 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 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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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 |
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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 three. The kernel 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 The most recent compression algorithm. Its ratio is best, decompression speed is between the other two. 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 Its compression ratio is the poorest among the 4. 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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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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config SWAP bool "Support for paging of anonymous memory (swap)" |
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depends on MMU && BLOCK |
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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" depends on NET && EXPERIMENTAL ---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 BSD_PROCESS_ACCT bool "BSD Process Accounting" 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 process and it's parent. Note that this file format is incompatible 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 FHANDLE bool "open by fhandle syscalls" select EXPORTFS 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. |
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config TASKSTATS bool "Export task/process statistics through netlink (EXPERIMENTAL)" depends on NET 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 bool "Enable per-task delay accounting (EXPERIMENTAL)" |
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depends on TASKSTATS |
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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 bool "Enable extended accounting over taskstats (EXPERIMENTAL)" 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 bool "Enable per-task storage I/O accounting (EXPERIMENTAL)" 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 AUDIT bool "Auditing support" |
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depends on NET |
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help Enable auditing infrastructure that can be used with another kernel subsystem, such as SELinux (which requires this for logging of avc messages output). Does not do system-call auditing without CONFIG_AUDITSYSCALL. config AUDITSYSCALL bool "Enable system-call auditing support" |
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depends on AUDIT && (X86 || PPC || S390 || IA64 || UML || SPARC64 || SUPERH) |
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default y if SECURITY_SELINUX help Enable low-overhead system-call auditing infrastructure that can be used independently or with another kernel subsystem, |
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such as SELinux. |
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config AUDIT_WATCH def_bool y depends on AUDITSYSCALL select FSNOTIFY |
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config AUDIT_TREE def_bool y |
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depends on AUDITSYSCALL |
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select FSNOTIFY |
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source "kernel/irq/Kconfig" |
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menu "RCU Subsystem" choice prompt "RCU Implementation" |
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default TREE_RCU |
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config TREE_RCU bool "Tree-based hierarchical RCU" |
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depends on !PREEMPT && SMP |
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help This option selects the RCU implementation that is designed for very large SMP system with hundreds or |
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thousands of CPUs. It also scales down nicely to smaller systems. |
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config TREE_PREEMPT_RCU |
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bool "Preemptible tree-based hierarchical RCU" |
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depends on PREEMPT help This option selects the RCU implementation that is designed for very large SMP systems with hundreds or thousands of CPUs, but for which real-time response |
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is also required. It also scales down nicely to smaller systems. |
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config TINY_RCU bool "UP-only small-memory-footprint RCU" depends on !SMP help This option selects the RCU implementation that is designed for UP systems from which real-time response is not required. This option greatly reduces the memory footprint of RCU. |
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config TINY_PREEMPT_RCU bool "Preemptible UP-only small-memory-footprint RCU" depends on !SMP && PREEMPT help This option selects the RCU implementation that is designed for real-time UP systems. This option greatly reduces the memory footprint of RCU. |
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endchoice |
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config PREEMPT_RCU def_bool ( TREE_PREEMPT_RCU || TINY_PREEMPT_RCU ) help This option enables preemptible-RCU code that is common between the TREE_PREEMPT_RCU and TINY_PREEMPT_RCU implementations. |
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config RCU_TRACE bool "Enable tracing for RCU" |
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help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. Say Y here if you want to enable RCU tracing Say N if you are unsure. config RCU_FANOUT int "Tree-based hierarchical RCU fanout value" range 2 64 if 64BIT range 2 32 if !64BIT |
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depends on TREE_RCU || TREE_PREEMPT_RCU |
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default 64 if 64BIT default 32 if !64BIT help This option controls the fanout of hierarchical implementations of RCU, allowing RCU to work efficiently on machines with |
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large numbers of CPUs. This value must be at least the fourth root of NR_CPUS, which allows NR_CPUS to be insanely large. The default value of RCU_FANOUT should be used for production systems, but if you are stress-testing the RCU implementation itself, small RCU_FANOUT values allow you to test large-system code paths on small(er) systems. |
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Select a specific number if testing RCU itself. Take the default if unsure. config RCU_FANOUT_EXACT bool "Disable tree-based hierarchical RCU auto-balancing" |
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depends on TREE_RCU || TREE_PREEMPT_RCU |
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default n help This option forces use of the exact RCU_FANOUT value specified, regardless of imbalances in the hierarchy. This is useful for testing RCU itself, and might one day be useful on systems with strong NUMA behavior. Without RCU_FANOUT_EXACT, the code will balance the hierarchy. Say N if unsure. |
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config RCU_FAST_NO_HZ bool "Accelerate last non-dyntick-idle CPU's grace periods" depends on TREE_RCU && NO_HZ && SMP default n help This option causes RCU to attempt to accelerate grace periods in order to allow the final CPU to enter dynticks-idle state more quickly. On the other hand, this option increases the overhead of the dynticks-idle checking, particularly on systems with large numbers of CPUs. Say Y if energy efficiency is critically important, particularly if you have relatively few CPUs. Say N if you are unsure. |
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config TREE_RCU_TRACE |
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def_bool RCU_TRACE && ( TREE_RCU || TREE_PREEMPT_RCU ) |
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select DEBUG_FS help |
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This option provides tracing for the TREE_RCU and TREE_PREEMPT_RCU implementations, permitting Makefile to trivially select kernel/rcutree_trace.c. |
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config RCU_BOOST bool "Enable RCU priority boosting" |
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depends on RT_MUTEXES && PREEMPT_RCU |
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default n help This option boosts the priority of preempted RCU readers that block the current preemptible RCU grace period for too long. This option also prevents heavy loads from blocking RCU callback invocation for all flavors of RCU. Say Y here if you are working with real-time apps or heavy loads Say N here if you are unsure. config RCU_BOOST_PRIO int "Real-time priority to boost RCU readers to" range 1 99 depends on RCU_BOOST default 1 help This option specifies the real-time priority to which preempted RCU readers are to be boosted. If you are working with CPU-bound real-time applications, you should specify a priority higher then the highest-priority CPU-bound application. Specify the real-time priority, or take the default if unsure. config RCU_BOOST_DELAY int "Milliseconds to delay boosting after RCU grace-period start" range 0 3000 depends on RCU_BOOST default 500 help This option specifies the time to wait after the beginning of a given grace period before priority-boosting preempted RCU readers blocking that grace period. Note that any RCU reader blocking an expedited RCU grace period is boosted immediately. Accept the default if unsure. |
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endmenu # "RCU Subsystem" |
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config IKCONFIG |
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tristate "Kernel .config support" |
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---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. |
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config LOG_BUF_SHIFT int "Kernel log buffer size (16 => 64KB, 17 => 128KB)" range 12 21 |
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default 17 |
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help Select kernel log buffer size as a power of 2. |
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Examples: 17 => 128 KB 16 => 64 KB 15 => 32 KB 14 => 16 KB |
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# # Architectures with an unreliable sched_clock() should select this: # config HAVE_UNSTABLE_SCHED_CLOCK bool |
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menuconfig CGROUPS boolean "Control Group support" |
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depends on EVENTFD |
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help |
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This option adds support for grouping sets of processes together, for |
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use with process control subsystems such as Cpusets, CFS, memory controls or device isolation. See |
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- Documentation/scheduler/sched-design-CFS.txt (CFS) |
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- Documentation/cgroups/ (features for grouping, isolation and resource control) |
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Say N if unsure. |
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if CGROUPS |
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config CGROUP_DEBUG bool "Example debug cgroup subsystem" |
5cdc38f98 cgroups: make cgr... |
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default n help This option enables a simple cgroup subsystem that exports useful debugging information about the cgroups |
23964d2d0 cgroups: clean up... |
560 |
framework. |
5cdc38f98 cgroups: make cgr... |
561 |
|
23964d2d0 cgroups: clean up... |
562 |
Say N if unsure. |
5cdc38f98 cgroups: make cgr... |
563 |
|
5cdc38f98 cgroups: make cgr... |
564 |
config CGROUP_FREEZER |
23964d2d0 cgroups: clean up... |
565 |
bool "Freezer cgroup subsystem" |
23964d2d0 cgroups: clean up... |
566 567 |
help Provides a way to freeze and unfreeze all tasks in a |
5cdc38f98 cgroups: make cgr... |
568 569 570 571 |
cgroup. config CGROUP_DEVICE bool "Device controller for cgroups" |
5cdc38f98 cgroups: make cgr... |
572 573 574 575 576 577 |
help Provides a cgroup implementing whitelists for devices which a process in the cgroup can mknod or open. config CPUSETS bool "Cpuset support" |
5cdc38f98 cgroups: make cgr... |
578 579 580 581 582 583 584 |
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. Say N if unsure. |
23964d2d0 cgroups: clean up... |
585 586 587 588 |
config PROC_PID_CPUSET bool "Include legacy /proc/<pid>/cpuset file" depends on CPUSETS default y |
d842de871 sched: cpu accoun... |
589 590 |
config CGROUP_CPUACCT bool "Simple CPU accounting cgroup subsystem" |
d842de871 sched: cpu accoun... |
591 592 |
help Provides a simple Resource Controller for monitoring the |
23964d2d0 cgroups: clean up... |
593 |
total CPU consumed by the tasks in a cgroup. |
d842de871 sched: cpu accoun... |
594 |
|
e552b6617 Memory controller... |
595 596 597 598 |
config RESOURCE_COUNTERS bool "Resource counters" help This option enables controller independent resource accounting |
23964d2d0 cgroups: clean up... |
599 |
infrastructure that works with cgroups. |
e552b6617 Memory controller... |
600 |
|
00f0b8259 Memory controller... |
601 602 |
config CGROUP_MEM_RES_CTLR bool "Memory Resource Controller for Control Groups" |
79ae9c29e namespaces Kconfi... |
603 |
depends on RESOURCE_COUNTERS |
cf475ad28 cgroups: add an o... |
604 |
select MM_OWNER |
00f0b8259 Memory controller... |
605 |
help |
84ad6d700 memcg: update men... |
606 |
Provides a memory resource controller that manages both anonymous |
21acb9caa trivial: fix wher... |
607 |
memory and page cache. (See Documentation/cgroups/memory.txt) |
00f0b8259 Memory controller... |
608 609 |
Note that setting this option increases fixed memory overhead |
84ad6d700 memcg: update men... |
610 611 612 613 |
associated with each page of memory in the system. By this, 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory usage tracking struct at boot. Total amount of this is printed out at boot. |
00f0b8259 Memory controller... |
614 615 |
Only enable when you're ok with these trade offs and really |
84ad6d700 memcg: update men... |
616 617 618 |
sure you need the memory resource controller. Even when you enable this, you can set "cgroup_disable=memory" at your boot option to disable memory resource controller and you can avoid overheads. |
c9d5409f8 memcg: fix a typo... |
619 |
(and lose benefits of memory resource controller) |
00f0b8259 Memory controller... |
620 |
|
cf475ad28 cgroups: add an o... |
621 622 |
This config option also selects MM_OWNER config option, which could in turn add some fork/exit overhead. |
c077719be memcg: mem+swap c... |
623 |
config CGROUP_MEM_RES_CTLR_SWAP |
65e0e8116 memcg: remove exp... |
624 625 |
bool "Memory Resource Controller Swap Extension" depends on CGROUP_MEM_RES_CTLR && SWAP |
c077719be memcg: mem+swap c... |
626 627 628 629 630 631 632 633 634 635 636 637 |
help Add swap management feature to memory resource controller. When you enable this, you can limit mem+swap usage per cgroup. In other words, when you disable this, memory resource controller has no cares to usage of swap...a process can exhaust all of the swap. This extension is useful when you want to avoid exhaustion swap but this itself adds more overheads and consumes memory for remembering information. Especially if you use 32bit system or small memory system, please be careful about enabling this. When memory resource controller is disabled by boot option, this will be automatically disabled and there will be no overhead from this. Even when you set this config=y, if boot option "noswapaccount" is set, swap will not be accounted. |
627991a20 memcg: remove red... |
638 639 |
Now, memory usage of swap_cgroup is 2 bytes per entry. If swap page size is 4096bytes, 512k per 1Gbytes of swap. |
a42c390cf cgroups: make swa... |
640 641 642 643 644 645 646 |
config CGROUP_MEM_RES_CTLR_SWAP_ENABLED bool "Memory Resource Controller Swap Extension enabled by default" depends on CGROUP_MEM_RES_CTLR_SWAP 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... |
647 |
which want to enable the feature but keep it disabled by default |
a42c390cf cgroups: make swa... |
648 649 650 651 652 |
and let the user enable it by swapaccount boot command line 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 then noswapaccount does the trick). |
c077719be memcg: mem+swap c... |
653 |
|
e5d1367f1 perf: Add cgroup ... |
654 655 656 657 658 |
config CGROUP_PERF bool "Enable perf_event per-cpu per-container group (cgroup) monitoring" depends on PERF_EVENTS && CGROUPS help This option extends the per-cpu mode to restrict monitoring to |
2d0f25201 perf cgroup: Fix ... |
659 |
threads which belong to the cgroup specified and run on the |
e5d1367f1 perf: Add cgroup ... |
660 661 662 |
designated cpu. Say N if unsure. |
7c9414385 sched: Remove USE... |
663 664 |
menuconfig CGROUP_SCHED bool "Group CPU scheduler" |
79ae9c29e namespaces Kconfi... |
665 |
depends on EXPERIMENTAL |
7c9414385 sched: Remove USE... |
666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 |
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 config RT_GROUP_SCHED bool "Group scheduling for SCHED_RR/FIFO" depends on EXPERIMENTAL depends on CGROUP_SCHED default n help This feature lets you explicitly allocate real CPU bandwidth |
32bd7eb5a sched: Remove rem... |
685 |
to task groups. If enabled, it will also make it impossible to |
7c9414385 sched: Remove USE... |
686 687 688 689 690 |
schedule realtime tasks for non-root users until you allocate realtime bandwidth for them. See Documentation/scheduler/sched-rt-group.txt for more information. endif #CGROUP_SCHED |
afc24d49c blk-cgroup: confi... |
691 692 |
config BLK_CGROUP tristate "Block IO controller" |
79ae9c29e namespaces Kconfi... |
693 |
depends on BLOCK |
afc24d49c blk-cgroup: confi... |
694 695 696 697 698 699 700 701 |
default n ---help--- Generic block IO controller cgroup interface. This is the common cgroup interface which should be used by various IO controlling policies. Currently, CFQ IO scheduler uses it to recognize task groups and control disk bandwidth allocation (proportional time slice allocation) |
e43473b7f blkio: Core imple... |
702 703 |
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. |
afc24d49c blk-cgroup: confi... |
704 705 |
This option only enables generic Block IO controller infrastructure. |
e43473b7f blkio: Core imple... |
706 |
One needs to also enable actual IO controlling logic/policy. For |
79e2e7597 Kconfig: Typo: se... |
707 708 |
enabling proportional weight division of disk bandwidth in CFQ, set CONFIG_CFQ_GROUP_IOSCHED=y; for enabling throttling policy, set |
c5e0591ae Kconfig: BLK_THRO... |
709 |
CONFIG_BLK_DEV_THROTTLING=y. |
afc24d49c blk-cgroup: confi... |
710 711 712 713 714 715 716 717 718 719 |
See Documentation/cgroups/blkio-controller.txt for more information. config DEBUG_BLK_CGROUP bool "Enable Block IO controller debugging" depends on BLK_CGROUP default n ---help--- Enable some debugging help. Currently it exports additional stat files in a cgroup which can be useful for debugging. |
23964d2d0 cgroups: clean up... |
720 |
endif # CGROUPS |
c077719be memcg: mem+swap c... |
721 |
|
8dd2a82c2 namespaces Kconfi... |
722 |
menuconfig NAMESPACES |
6a108a14f kconfig: rename C... |
723 724 |
bool "Namespaces support" if EXPERT default !EXPERT |
c5289a694 namespaces: add t... |
725 726 727 728 729 |
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... |
730 |
if NAMESPACES |
58bfdd6de namespaces: move ... |
731 732 |
config UTS_NS bool "UTS namespace" |
17a6d4411 namespaces: defau... |
733 |
default y |
58bfdd6de namespaces: move ... |
734 735 736 |
help In this namespace tasks see different info provided with the uname() system call |
ae5e1b22f namespaces: move ... |
737 738 |
config IPC_NS bool "IPC namespace" |
8dd2a82c2 namespaces Kconfi... |
739 |
depends on (SYSVIPC || POSIX_MQUEUE) |
17a6d4411 namespaces: defau... |
740 |
default y |
ae5e1b22f namespaces: move ... |
741 742 |
help In this namespace tasks work with IPC ids which correspond to |
614b84cf4 namespaces: mqueu... |
743 |
different IPC objects in different namespaces. |
ae5e1b22f namespaces: move ... |
744 |
|
aee16ce73 namespaces: clean... |
745 746 |
config USER_NS bool "User namespace (EXPERIMENTAL)" |
8dd2a82c2 namespaces Kconfi... |
747 |
depends on EXPERIMENTAL |
17a6d4411 namespaces: defau... |
748 |
default y |
aee16ce73 namespaces: clean... |
749 750 751 752 |
help This allows containers, i.e. vservers, to use user namespaces to provide different user info for different servers. If unsure, say N. |
74bd59bb3 namespaces: clean... |
753 |
config PID_NS |
9bd38c2cd namespaces: remov... |
754 |
bool "PID Namespaces" |
17a6d4411 namespaces: defau... |
755 |
default y |
74bd59bb3 namespaces: clean... |
756 |
help |
12d2b8f95 kconfig: fix typo... |
757 |
Support process id namespaces. This allows having multiple |
692105b8a trivial: fix typo... |
758 |
processes with the same pid as long as they are in different |
74bd59bb3 namespaces: clean... |
759 |
pid namespaces. This is a building block of containers. |
d6eb633fe net: Move config ... |
760 761 |
config NET_NS bool "Network namespace" |
8dd2a82c2 namespaces Kconfi... |
762 |
depends on NET |
17a6d4411 namespaces: defau... |
763 |
default y |
d6eb633fe net: Move config ... |
764 765 766 |
help Allow user space to create what appear to be multiple instances of the network stack. |
8dd2a82c2 namespaces Kconfi... |
767 |
endif # NAMESPACES |
5091faa44 sched: Add 'autog... |
768 769 770 771 772 773 774 775 776 777 778 779 |
config SCHED_AUTOGROUP bool "Automatic process group scheduling" select EVENTFD 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... |
780 781 782 783 |
config MM_OWNER bool config SYSFS_DEPRECATED |
5d6a4ea57 sysfs: Capitalize... |
784 |
bool "Enable deprecated sysfs features to support old userspace tools" |
7af37bec4 namespaces Kconfi... |
785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 |
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... |
807 |
bool "Enable deprecated sysfs features by default" |
7af37bec4 namespaces Kconfi... |
808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 |
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)" 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... |
831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 |
config BLK_DEV_INITRD bool "Initial RAM filesystem and RAM disk (initramfs/initrd) support" depends on BROKEN || !FRV 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, etc. See <file:Documentation/initrd.txt> for details. 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... |
846 |
if BLK_DEV_INITRD |
dbec48663 kconfig: move ini... |
847 |
source "usr/Kconfig" |
c33df4eaa [PATCH] disable i... |
848 |
endif |
c45b4f1f1 Move size optimiz... |
849 |
config CC_OPTIMIZE_FOR_SIZE |
96fffeb4b make CC_OPTIMIZE_... |
850 |
bool "Optimize for size" |
c45b4f1f1 Move size optimiz... |
851 852 853 |
help Enabling this option will pass "-Os" instead of "-O2" to gcc resulting in a smaller kernel. |
775a7229a Kconfig/init: cha... |
854 |
If unsure, say Y. |
c45b4f1f1 Move size optimiz... |
855 |
|
0847062ad [PATCH] fix EMBED... |
856 857 |
config SYSCTL bool |
b943c460f menu: fix embedde... |
858 859 |
config ANON_INODES bool |
6a108a14f kconfig: rename C... |
860 861 |
menuconfig EXPERT bool "Configure standard kernel features (expert users)" |
1da177e4c Linux-2.6.12-rc2 |
862 863 864 865 866 |
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: ... |
867 |
config UID16 |
6a108a14f kconfig: rename C... |
868 |
bool "Enable 16-bit UID system calls" if EXPERT |
09337f501 sparc64: Kill CON... |
869 |
depends on ARM || BLACKFIN || CRIS || FRV || H8300 || X86_32 || M68K || (S390 && !64BIT) || SUPERH || SPARC32 || (SPARC64 && COMPAT) || UML || (X86_64 && IA32_EMULATION) |
ae81f9e37 [PATCH] Kconfig: ... |
870 871 872 |
default y help This enables the legacy 16-bit UID syscall wrappers. |
b89a81712 [PATCH] sysctl: A... |
873 |
config SYSCTL_SYSCALL |
6a108a14f kconfig: rename C... |
874 |
bool "Sysctl syscall support" if EXPERT |
26a7034b4 sysctl: Reduce sy... |
875 |
depends on PROC_SYSCTL |
13bb7e37e [PATCH] sysctl: U... |
876 |
default y |
b89a81712 [PATCH] sysctl: A... |
877 |
select SYSCTL |
ae81f9e37 [PATCH] Kconfig: ... |
878 |
---help--- |
13bb7e37e [PATCH] sysctl: U... |
879 880 881 882 |
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... |
883 |
|
13bb7e37e [PATCH] sysctl: U... |
884 885 886 |
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... |
887 |
|
13bb7e37e [PATCH] sysctl: U... |
888 |
If unsure say Y here. |
ae81f9e37 [PATCH] Kconfig: ... |
889 |
|
1da177e4c Linux-2.6.12-rc2 |
890 |
config KALLSYMS |
6a108a14f kconfig: rename C... |
891 |
bool "Load all symbols for debugging/ksymoops" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
892 893 894 895 896 897 898 899 900 901 |
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 |
71a83ec7d Kconfig: improve ... |
902 903 904 905 906 907 908 909 910 911 912 913 |
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. |
d59745ce3 [PATCH] clean up ... |
914 |
|
712f47cea [PATCH] HOTPLUG: ... |
915 |
config HOTPLUG |
6a108a14f kconfig: rename C... |
916 |
bool "Support for hot-pluggable devices" if EXPERT |
712f47cea [PATCH] HOTPLUG: ... |
917 918 919 920 921 922 |
default y help This option is provided for the case where no hotplug or uevent capabilities is wanted by the kernel. You should only consider disabling this option for embedded systems that do not use modules, a dynamic /dev tree, or dynamic device discovery. Just say Y. |
d59745ce3 [PATCH] clean up ... |
923 924 |
config PRINTK default y |
6a108a14f kconfig: rename C... |
925 |
bool "Enable support for printk" if EXPERT |
d59745ce3 [PATCH] clean up ... |
926 927 928 929 930 931 |
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. |
c8538a7aa [PATCH] remove al... |
932 |
config BUG |
6a108a14f kconfig: rename C... |
933 |
bool "BUG() support" if EXPERT |
c8538a7aa [PATCH] remove al... |
934 935 936 937 938 939 940 |
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... |
941 942 |
config ELF_CORE default y |
6a108a14f kconfig: rename C... |
943 |
bool "Enable ELF core dumps" if EXPERT |
708e9a794 [PATCH] tiny: Con... |
944 945 |
help Enable support for generating core dumps. Disabling saves about 4k. |
e5e1d3cb2 pcspkr: fix depen... |
946 |
config PCSPKR_PLATFORM |
6a108a14f kconfig: rename C... |
947 |
bool "Enable PC-Speaker support" if EXPERT |
e5e1d3cb2 pcspkr: fix depen... |
948 949 950 951 952 |
depends on ALPHA || X86 || MIPS || PPC_PREP || PPC_CHRP || PPC_PSERIES default y help This option allows to disable the internal PC-Speaker support, saving some memory. |
1da177e4c Linux-2.6.12-rc2 |
953 954 |
config BASE_FULL default y |
6a108a14f kconfig: rename C... |
955 |
bool "Enable full-sized data structures for core" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
956 957 958 959 960 961 |
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... |
962 |
bool "Enable futex support" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
963 |
default y |
23f78d4a0 [PATCH] pi-futex:... |
964 |
select RT_MUTEXES |
1da177e4c Linux-2.6.12-rc2 |
965 966 967 968 969 970 |
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. config EPOLL |
6a108a14f kconfig: rename C... |
971 |
bool "Enable eventpoll support" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
972 |
default y |
448e3cee8 ANON_INODES shoul... |
973 |
select ANON_INODES |
1da177e4c Linux-2.6.12-rc2 |
974 975 976 |
help Disabling this option will cause the kernel to be built without support for epoll family of system calls. |
fba2afaae signal/timer/even... |
977 |
config SIGNALFD |
6a108a14f kconfig: rename C... |
978 |
bool "Enable signalfd() system call" if EXPERT |
448e3cee8 ANON_INODES shoul... |
979 |
select ANON_INODES |
fba2afaae signal/timer/even... |
980 981 982 983 984 985 |
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... |
986 |
config TIMERFD |
6a108a14f kconfig: rename C... |
987 |
bool "Enable timerfd() system call" if EXPERT |
448e3cee8 ANON_INODES shoul... |
988 |
select ANON_INODES |
b215e2839 signal/timer/even... |
989 990 991 992 993 994 |
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... |
995 |
config EVENTFD |
6a108a14f kconfig: rename C... |
996 |
bool "Enable eventfd() system call" if EXPERT |
448e3cee8 ANON_INODES shoul... |
997 |
select ANON_INODES |
e1ad7468c signal/timer/even... |
998 999 1000 1001 1002 1003 |
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 |
1004 |
config SHMEM |
6a108a14f kconfig: rename C... |
1005 |
bool "Use full shmem filesystem" if EXPERT |
1da177e4c Linux-2.6.12-rc2 |
1006 1007 1008 1009 1010 1011 1012 1013 |
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... |
1014 |
config AIO |
6a108a14f kconfig: rename C... |
1015 |
bool "Enable AIO support" if EXPERT |
ebf3f09c6 Configure out AIO... |
1016 1017 1018 1019 1020 |
default y help This option enables POSIX asynchronous I/O which may by used by some high performance threaded applications. Disabling this option saves about 7k. |
6befe5f69 init/Kconfig: fix... |
1021 1022 1023 1024 1025 1026 1027 |
config EMBEDDED bool "Embedded system" 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 ... |
1028 |
config HAVE_PERF_EVENTS |
0793a61d4 performance count... |
1029 |
bool |
018df72dd perf_counter: Sta... |
1030 1031 |
help See tools/perf/design.txt for details. |
0793a61d4 performance count... |
1032 |
|
906010b21 perf_event: Provi... |
1033 1034 1035 1036 |
config PERF_USE_VMALLOC bool help See tools/perf/design.txt for details |
57c0c15b5 perf: Tidy up aft... |
1037 |
menu "Kernel Performance Events And Counters" |
0793a61d4 performance count... |
1038 |
|
cdd6c482c perf: Do the big ... |
1039 |
config PERF_EVENTS |
57c0c15b5 perf: Tidy up aft... |
1040 1041 |
bool "Kernel performance events and counters" default y if (PROFILING || PERF_COUNTERS) |
cdd6c482c perf: Do the big ... |
1042 |
depends on HAVE_PERF_EVENTS |
4c59e4676 perfcounters: sel... |
1043 |
select ANON_INODES |
e360adbe2 irq_work: Add gen... |
1044 |
select IRQ_WORK |
0793a61d4 performance count... |
1045 |
help |
57c0c15b5 perf: Tidy up aft... |
1046 1047 |
Enable kernel support for various performance events provided by software and hardware. |
0793a61d4 performance count... |
1048 |
|
dd77038d2 perf_events: Fix ... |
1049 |
Software events are supported either built-in or via the |
57c0c15b5 perf: Tidy up aft... |
1050 |
use of generic tracepoints. |
0793a61d4 performance count... |
1051 |
|
57c0c15b5 perf: Tidy up aft... |
1052 1053 |
Most modern CPUs support performance events via performance counter registers. These registers count the number of certain |
0793a61d4 performance count... |
1054 1055 1056 1057 1058 |
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... |
1059 |
The Linux Performance Event subsystem provides an abstraction of |
dd77038d2 perf_events: Fix ... |
1060 |
these software and hardware event capabilities, available via a |
57c0c15b5 perf: Tidy up aft... |
1061 |
system call and used by the "perf" utility in tools/perf/. It |
0793a61d4 performance count... |
1062 1063 1064 1065 |
provides per task and per CPU counters, and it provides event capabilities on top of those. Say Y if unsure. |
57c0c15b5 perf: Tidy up aft... |
1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 |
config PERF_COUNTERS bool "Kernel performance counters (old config option)" depends on HAVE_PERF_EVENTS help This config has been obsoleted by the PERF_EVENTS config option - please see that one for details. It has no effect on the kernel whether you enable it or not, it is a compatibility placeholder. Say N if unsure. |
906010b21 perf_event: Provi... |
1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 |
config DEBUG_PERF_USE_VMALLOC default n bool "Debug: use vmalloc to back perf mmap() buffers" depends on PERF_EVENTS && DEBUG_KERNEL 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... |
1089 |
endmenu |
f8891e5e1 [PATCH] Light wei... |
1090 1091 |
config VM_EVENT_COUNTERS default y |
6a108a14f kconfig: rename C... |
1092 |
bool "Enable VM event counters for /proc/vmstat" if EXPERT |
f8891e5e1 [PATCH] Light wei... |
1093 |
help |
2aea4fb61 [PATCH] CONFIG_VM... |
1094 1095 |
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... |
1096 |
on EXPERT systems. /proc/vmstat will only show page counts |
2aea4fb61 [PATCH] CONFIG_VM... |
1097 |
if VM event counters are disabled. |
f8891e5e1 [PATCH] Light wei... |
1098 |
|
3d1373102 PCI: allow quirks... |
1099 1100 |
config PCI_QUIRKS default y |
6a108a14f kconfig: rename C... |
1101 |
bool "Enable PCI quirk workarounds" if EXPERT |
61cfc7e44 PCI: PCI_QUIRKS d... |
1102 |
depends on PCI |
3d1373102 PCI: allow quirks... |
1103 1104 1105 1106 |
help This enables workarounds for various PCI chipset bugs/quirks. Disable this only if your target machine is unaffected by PCI quirks. |
41ecc55b8 SLUB: add CONFIG_... |
1107 1108 |
config SLUB_DEBUG default y |
6a108a14f kconfig: rename C... |
1109 |
bool "Enable SLUB debugging support" if EXPERT |
f6acb6350 slub: #ifdef simp... |
1110 |
depends on SLUB && SYSFS |
41ecc55b8 SLUB: add CONFIG_... |
1111 1112 1113 1114 1115 |
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. |
b943c460f menu: fix embedde... |
1116 1117 1118 1119 1120 1121 1122 |
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... |
1123 |
disabled, and can be overridden at runtime by setting |
b943c460f menu: fix embedde... |
1124 1125 1126 |
/proc/sys/kernel/randomize_va_space to 2. On non-ancient distros (post-2000 ones) N is usually a safe choice. |
81819f0fc SLUB core |
1127 1128 |
choice prompt "Choose SLAB allocator" |
a0acd8208 Make SLUB the def... |
1129 |
default SLUB |
81819f0fc SLUB core |
1130 1131 1132 1133 1134 1135 1136 |
help This option allows to select a slab allocator. config SLAB bool "SLAB" help The regular slab allocator that is established and known to work |
34013886e Fix spellings of ... |
1137 |
well in all environments. It organizes cache hot objects in |
02f562104 Kconfig: SLUB is ... |
1138 |
per cpu and per node queues. |
81819f0fc SLUB core |
1139 1140 |
config SLUB |
81819f0fc SLUB core |
1141 1142 1143 1144 1145 1146 |
bool "SLUB (Unqueued Allocator)" 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 ... |
1147 1148 |
and has enhanced diagnostics. SLUB is the default choice for a slab allocator. |
81819f0fc SLUB core |
1149 1150 |
config SLOB |
6a108a14f kconfig: rename C... |
1151 |
depends on EXPERT |
81819f0fc SLUB core |
1152 1153 |
bool "SLOB (Simple Allocator)" help |
372914582 slob: correct Kco... |
1154 1155 1156 |
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 |
1157 1158 |
endchoice |
ea6376395 nommu: fix malloc... |
1159 1160 |
config MMAP_ALLOW_UNINITIALIZED bool "Allow mmapped anonymous memory to be uninitialized" |
6a108a14f kconfig: rename C... |
1161 |
depends on EXPERT && !MMU |
ea6376395 nommu: fix malloc... |
1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 |
default n help Normally, and according to the Linux spec, anonymous memory obtained from mmap() has it's contents cleared before it is passed to 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. |
125e56458 Move Kconfig.inst... |
1180 |
config PROFILING |
b309a294e oprofile: remove ... |
1181 |
bool "Profiling support" |
125e56458 Move Kconfig.inst... |
1182 1183 1184 |
help Say Y here to enable the extended profiling support mechanisms used by profilers such as OProfile. |
5f87f1121 tracing: clean up... |
1185 1186 1187 1188 |
# # Place an empty function call at each tracepoint site. Can be # dynamically changed for a probe function. # |
97e1c18e8 tracing: Kernel T... |
1189 |
config TRACEPOINTS |
5f87f1121 tracing: clean up... |
1190 |
bool |
97e1c18e8 tracing: Kernel T... |
1191 |
|
fb32e03fd Create arch/Kconfig |
1192 |
source "arch/Kconfig" |
1da177e4c Linux-2.6.12-rc2 |
1193 |
endmenu # General setup |
ee7e5516b generic: per-devi... |
1194 1195 1196 |
config HAVE_GENERIC_DMA_COHERENT bool default n |
158a96242 Unify /proc/slabi... |
1197 1198 1199 |
config SLABINFO bool depends on PROC_FS |
0f389ec63 slub: No need for... |
1200 |
depends on SLAB || SLUB_DEBUG |
158a96242 Unify /proc/slabi... |
1201 |
default y |
ae81f9e37 [PATCH] Kconfig: ... |
1202 1203 |
config RT_MUTEXES boolean |
ae81f9e37 [PATCH] Kconfig: ... |
1204 |
|
1da177e4c Linux-2.6.12-rc2 |
1205 1206 1207 1208 |
config BASE_SMALL int default 0 if BASE_FULL default 1 if !BASE_FULL |
66da57332 Use menuconfig ob... |
1209 |
menuconfig MODULES |
1da177e4c Linux-2.6.12-rc2 |
1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 |
bool "Enable loadable module support" 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 "... |
1228 |
if MODULES |
826e4506a Make forced modul... |
1229 1230 |
config MODULE_FORCE_LOAD bool "Forced module loading" |
826e4506a Make forced modul... |
1231 1232 |
default n help |
91e37a793 module: don't ign... |
1233 1234 1235 |
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... |
1236 |
|
1da177e4c Linux-2.6.12-rc2 |
1237 1238 |
config MODULE_UNLOAD bool "Module unloading" |
1da177e4c Linux-2.6.12-rc2 |
1239 1240 1241 |
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... |
1242 1243 |
anyway), which makes your kernel smaller, faster and simpler. If unsure, say Y. |
1da177e4c Linux-2.6.12-rc2 |
1244 1245 1246 1247 1248 1249 1250 1251 1252 1253 |
config MODULE_FORCE_UNLOAD bool "Forced module unloading" depends on MODULE_UNLOAD && EXPERIMENTAL 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 |
1254 |
config MODVERSIONS |
0d5416433 kbuild: remove EX... |
1255 |
bool "Module versioning support" |
1da177e4c Linux-2.6.12-rc2 |
1256 1257 1258 1259 1260 1261 1262 1263 1264 1265 |
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. config MODULE_SRCVERSION_ALL bool "Source checksum for all modules" |
1da177e4c Linux-2.6.12-rc2 |
1266 1267 1268 1269 1270 1271 1272 1273 |
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. |
0b0de1443 Kconfig: Extend "... |
1274 |
endif # MODULES |
98a79d6a5 cpumask: centrali... |
1275 1276 1277 1278 1279 1280 1281 |
config INIT_ALL_POSSIBLE bool help Back when each arch used to define their own cpu_online_map and cpu_possible_map, some of them chose to initialize cpu_possible_map 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 |
692105b8a trivial: fix typo... |
1282 |
and have several arch maintainers pursuing me down dark alleys. |
98a79d6a5 cpumask: centrali... |
1283 |
|
1da177e4c Linux-2.6.12-rc2 |
1284 1285 1286 1287 1288 1289 |
config STOP_MACHINE bool default y depends on (SMP && MODULE_UNLOAD) || HOTPLUG_CPU help Need stop_machine() primitive. |
3a65dfe8c [BLOCK] Move all ... |
1290 |
|
3a65dfe8c [BLOCK] Move all ... |
1291 |
source "block/Kconfig" |
e98c32029 Move PREEMPT_NOTI... |
1292 1293 1294 |
config PREEMPT_NOTIFIERS bool |
e260be673 Preempt-RCU: impl... |
1295 |
|
16295bec6 padata: Generic p... |
1296 1297 1298 |
config PADATA depends on SMP bool |
6beb00092 locking: Make inl... |
1299 |
source "kernel/Kconfig.locks" |