20 Oct, 2007
40 commits
-
Begin infrastructure for kernel code samples in the samples/ directory.
Add its Kconfig and Kbuild files.
Source its Kconfig file in all arch/ Kconfigs.Signed-off-by: Randy Dunlap
Signed-off-by: Mathieu Desnoyers
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The marker activation functions sits in kernel/marker.c. A hash table is used
to keep track of the registered probes and armed markers, so the markers
within a newly loaded module that should be active can be activated at module
load time.marker_query has been removed. marker_get_first, marker_get_next and
marker_release should be used as iterators on the markers.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Mathieu Desnoyers
Acked-by: "Frank Ch. Eigler"
Cc: Christoph Hellwig
Cc: Rusty Russell
Cc: Mike Mason
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Quoting Randy:
"It seems sad that this patch sources Kconfig.marker, a 7-line file,
20-something times. Yes, you (we) don't want to put those 7 lines into
20-something different files, so sourcing is the right thing.However, what you did for avr32 seems more on the right track to me: make
_one_ Instrumentation support menu that includes PROFILING, OPROFILE, KPROBES,
and MARKERS and then use (source) that in all of the arches."Signed-off-by: Mathieu Desnoyers
Acked-by: Randy Dunlap
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Prior to use struct marker in the linux kernel markers, we need to clean
two drivers which use this structure name.Change bonding driver types :
- struct marker to struct bond_marker.
- marker_t to bond_marker_t.
- marker_header to bond_marker_header.
- marker_header_t to bond_marker_header_t.Change qla4xxx struct marker_entry usage :
- Change struct marker_entry for struct qla4_marker_entry.Signed-off-by: Mathieu Desnoyers
Cc: Chad Tindel
Cc: Jay Vosburgh
Cc: David Somayajulu
Cc: James Bottomley
Cc: Ravi Anand
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Enable "cgroup" (formerly containers) based fair group scheduling. This
will let administrator create arbitrary groups of tasks (using "cgroup"
pseudo filesystem) and control their cpu bandwidth usage.[akpm@linux-foundation.org: fix cpp condition]
Signed-off-by: Srivatsa Vaddagiri
Signed-off-by: Dhaval Giani
Cc: Randy Dunlap
Cc: Balbir Singh
Cc: Paul Menage
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This adds the documentation for the extended crashkernel syntax into
Documentation/kdump/kdump.txt.Signed-off-by: Bernhard Walle
Cc: Andi Kleen
Cc: "Luck, Tony"
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Paul Mundt
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch removes the crashkernel parsing from arch/sh/kernel/machine_kexec.c
and calls the generic function, introduced in the generic patch, in
setup_bootmem_allocator().This is necessary because the amount of System RAM must be known in this
function now because of the new syntax.Signed-off-by: Bernhard Walle
Acked-by: Paul Mundt
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch adapts the ppc64 code to use the generic parse_crashkernel()
function introduced in the generic patch of that series.Signed-off-by: Bernhard Walle
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch adapts IA64 to use the generic parse_crashkernel() function instead
of its own parsing for the crashkernel command line.Because the total amount of System RAM must be known when calling this
function, efi_memmap_init() is modified to return its accumulated total_memory
variable.Also, the crashkernel handling is moved in an own function in
arch/ia64/kernel/setup.c to make the code more readable.[kamalesh@linux.vnet.ibm.com: build fix]
Signed-off-by: Bernhard Walle
Cc: "Luck, Tony"
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Signed-off-by: Kamalesh Babulal
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch removes the crashkernel parsing from
arch/x86_64/kernel/machine_kexec.c and calls the generic function, introduced
in the last patch, in setup_bootmem_allocator().This is necessary because the amount of System RAM must be known in this
function now because of the new syntax.Signed-off-by: Bernhard Walle
Cc: Andi Kleen
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Cc: Thomas Gleixner
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch removes the crashkernel parsing from
arch/i386/kernel/machine_kexec.c and calls the generic function, introduced in
the last patch, in setup_bootmem_allocator().This is necessary because the amount of System RAM must be known in this
function now because of the new syntax.Signed-off-by: Bernhard Walle
Cc: Andi Kleen
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Cc: Thomas Gleixner
Cc: Ingo Molnar
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch adds a extended crashkernel syntax that makes the value of reserved
system RAM dependent on the system RAM itself:crashkernel=:[,:,...][@offset]
range=start-[end]For example:
crashkernel=512M-2G:64M,2G-:128M
The motivation comes from distributors that configure their crashkernel
command line automatically with some configuration tool (YaST, you know ;)).
Of course that tool knows the value of System RAM, but if the user removes
RAM, then the system becomes unbootable or at least unusable and error
handling is very difficult.This series implements this change for i386, x86_64, ia64, ppc64 and sh. That
should be all platforms that support kdump in current mainline. I tested all
platforms except sh due to the lack of a sh processor.This patch:
This is the generic part of the patch. It adds a parse_crashkernel() function
in kernel/kexec.c that is called by the architecture specific code that
actually reserves the memory. That function takes the whole command line and
looks itself for "crashkernel=" in it.If there are multiple occurrences, then the last one is taken. The advantage
is that if you have a bootloader like lilo or elilo which allows you to append
a command line parameter but not to remove one (like in GRUB), then you can
add another crashkernel value for testing at the boot command line and this
one overwrites the command line in the configuration then.Signed-off-by: Bernhard Walle
Cc: Andi Kleen
Cc: "Luck, Tony"
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Paul Mundt
Cc: Vivek Goyal
Cc: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
With the use of idr to store the ipc, the case where the idr cache is
empty, when idr_get_new is called (this may happen even if we call
idr_pre_get() before), is not well handled: it lets
semget()/shmget()/msgget() return ENOSPC when this cache is empty, what 1.
does not reflect the facts and 2. does not conform to the man(s).This patch fixes this by retrying the whole process of allocation in this case.
Signed-off-by: Pierre Peiffer
Cc: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Virtualization of sysv msg queues is incomplete: msg_hdrs and msg_bytes
variables visible from userspace are global. Let's make them
per-namespace.Signed-off-by: Alexey Kuznetsov
Signed-off-by: Kirill Korotaev
Cc: Pierre Peiffer
Cc: Nadia Derbey
Cc: Serge Hallyn
Acked-by: "Eric W. Biederman"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Some comments about sem_undo_list seem wrong.
About the comment above unlock_semundo:
"... If task2 now exits before task1 releases the lock (by calling
unlock_semundo()), then task1 will never call spin_unlock(). ..."This is just wrong, I see no reason for which task1 will not call
spin_unlock... The rest of this comment is also wrong... Unless I
miss something (of course).Finally, (un)lock_semundo functions are useless, so remove them
for simplification. (this avoids an useless if statement)Signed-off-by: Pierre Peiffer
Cc: Nadia Derbey
Acked-by: Serge Hallyn
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Remvoe the unneeded parameters from ipc_checkid() and ipc_buildid()
interfaces.Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is a patch that fixes the way idr_find() used to be called in ipc_lock():
in all the paths that don't imply an update of the ipcs idr, it was called
without the idr tree being locked.The changes are:
. in ipc_ids, the mutex has been changed into a reader/writer semaphore.
. ipc_lock() now takes the mutex as a reader during the idr_find().
. a new routine ipc_lock_down() has been defined: it doesn't take the
mutex, assuming that it is being held by the caller. This is the routine
that is now called in all the update paths.Signed-off-by: Nadia Derbey
Acked-by: Jarek Poplawski
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch fixes the wrong / obsolete comments in the ipc code. Also adds
a missing lock around ipc_get_maxid() in shm_get_stat().Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is a trivial patch that changes the ipc_buildid() routine into a static
inline.Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is a trivial patch that changes all the (id % SEQ_MULTIPLIER) into a call
to the ipcid_to_idx(id) macro.Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch converts casts of struct kern_ipc_perm to
. struct msg_queue
. struct sem_array
. struct shmid_kernel
into the equivalent container_of() macro. It improves code maintenance
because the code need not change if kern_ipc_perm is no longer at the
beginning of the containing struct.Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch introduces a new ipc_lock_check() routine interface:
. each time ipc_checkid() is called, this is done after calling ipc_lock().
ipc_checkid() is now called from inside ipc_lock_check().[akpm@linux-foundation.org: build fix]
[akpm@linux-foundation.org: fix RCU locking]
Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This is a trivial patch that removes the ipc_get() routine: it is replaced
by a call to idr_find().Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch introduces a change into the sys_msgget(), sys_semget() and
sys_shmget() routines: they now share a common code, which is better for
maintainability.Signed-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
This patch introduces ipcs storage into IDRs. The main changes are:
. This ipc_ids structure is changed: the entries array is changed into a
root idr structure.
. The grow_ary() routine is removed: it is not needed anymore when adding
an ipc structure, since we are now using the IDR facility.
. The ipc_rmid() routine interface is changed:
. there is no need for this routine to return the pointer passed in as
argument: it is now declared as a void
. since the id is now part of the kern_ipc_perm structure, no need to
have it as an argument to the routineSigned-off-by: Nadia Derbey
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Some of the per-cpu counters and thus their locks are accessed from IRQ
contexts. This can cause a deadlock if it interrupts a cpu-offline thread
which is transferring a dead-cpu's counts to the global counter.Add appropriate IRQ protection in the cpu-hotplug callback path.
Signed-off-by: Gautham R Shenoy
Cc: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
cpu-hot-add should be fail if cpu is not set in cpu_possible_map. If go
ahead, the system will panic soon.Especially, arch which requires additional_cpus= parameter should handle
this. Tested on ia64.[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: KAMEZAWA Hiroyuki
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When a cpu is disabled, move_task_off_dead_cpu() is called for tasks that have
been running on that cpu.Currently, such a task is migrated:
1) to any cpu on the same node as the disabled cpu, which is both online
and among that task's cpus_allowed
2) to any cpu which is both online and among that task's cpus_allowedIt is typical of a multithreaded application running on a large NUMA system to
have its tasks confined to a cpuset so as to cluster them near the memory that
they share. Furthermore, it is typical to explicitly place such a task on a
specific cpu in that cpuset. And in that case the task's cpus_allowed
includes only a single cpu.This patch would insert a preference to migrate such a task to some cpu within
its cpuset (and set its cpus_allowed to its entire cpuset).With this patch, migrate the task to:
1) to any cpu on the same node as the disabled cpu, which is both online
and among that task's cpus_allowed
2) to any online cpu within the task's cpuset
3) to any cpu which is both online and among that task's cpus_allowedIn order to do this, move_task_off_dead_cpu() must make a call to
cpuset_cpus_allowed_locked(), a new subset of cpuset_cpus_allowed(), that will
not block. (name change - per Oleg's suggestion)Calls are made to cpuset_lock() and cpuset_unlock() in migration_call() to set
the cpuset mutex during the whole migrate_live_tasks() and
migrate_dead_tasks() procedure.[akpm@linux-foundation.org: build fix]
[pj@sgi.com: Fix indentation and spacing]
Signed-off-by: Cliff Wickman
Cc: Oleg Nesterov
Cc: Christoph Lameter
Cc: Paul Jackson
Cc: Ingo Molnar
Signed-off-by: Paul Jackson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Replace "cont" with "cgrp" and other misc renaming
This patch finishes some of the names that got missed in the great
"task containers" -> "control groups" rename. Primarily it renames
the local variable "cont" to "cgrp" in a number of places, and renames
the CONT_* enum members to CGRP_*.This patch is not intended to have any effect on the generated code;
the output of "objdump -d kernel/cgroup.o" is unchanged.Signed-off-by: Paul Menage
Acked-by: Paul Jackson
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
There are two places that do so - the cgroups subsystem and the autofs
code.Signed-off-by: Pavel Emelyanov
Cc: Ian Kent
Cc: Paul Menage
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The sync_master_pid and sync_backup_pid are set in set_sync_pid() and are
used later for set/not-set checks and in printk. So it is safe to use the
global pid value in this case.Signed-off-by: Pavel Emelyanov
Acked-by: Sukadev Bhattiprolu
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
When removing the explicit task_struct->pid usage I found that
proc_readfd_common() and proc_pident_readdir() get this field, but do not
use it at all. So this cleanup is a cheap help with the task_struct->pid
isolation.Signed-off-by: Pavel Emelyanov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
One of the easiest things to isolate is the pid printed in kernel log.
There was a patch, that made this for arch-independent code, this one makes
so for arch/xxx files.It took some time to cross-compile it, but hopefully these are all the
printks in arch code.Signed-off-by: Alexey Dobriyan
Signed-off-by: Pavel Emelyanov
Cc:
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The task_struct->pid member is going to be deprecated, so start
using the helpers (task_pid_nr/task_pid_vnr/task_pid_nr_ns) in
the kernel.The first thing to start with is the pid, printed to dmesg - in
this case we may safely use task_pid_nr(). Besides, printks produce
more (much more) than a half of all the explicit pid usage.[akpm@linux-foundation.org: git-drm went and changed lots of stuff]
Signed-off-by: Pavel Emelyanov
Cc: Dave Airlie
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
The pgrp field is not used widely around the kernel so it is now marked as
deprecated with appropriate comment.The initialization of INIT_SIGNALS is trimmed because
a) they are set to 0 automatically;
b) gcc cannot properly initialize two anonymous (the second one
is the one with the session) unions. In this particular case
to make it compile we'd have to add some field initialized
right before the .pgrp.This is the same patch as the 1ec320afdc9552c92191d5f89fcd1ebe588334ca one
(from Cedric), but for the pgrp field.Some progress report:
We have to deprecate the pid, tgid, session and pgrp fields on struct
task_struct and struct signal_struct. The session and pgrp are already
deprecated. The tgid value is close to being such - the worst known usage
in in fs/locks.c and audit code. The pid field deprecation is mainly
blocked by numerous printk-s around the kernel that print the tsk->pid to
log.Signed-off-by: Pavel Emelyanov
Cc: Oleg Nesterov
Cc: Sukadev Bhattiprolu
Cc: Cedric Le Goater
Cc: Serge Hallyn
Cc: "Eric W. Biederman"
Cc: Herbert Poetzl
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
tsk->exit_state can only be 0, EXIT_ZOMBIE, or EXIT_DEAD. A non-zero test
is the same as tsk->exit_state & (EXIT_ZOMBIE | EXIT_DEAD), so just testing
tsk->exit_state is sufficient.Signed-off-by: Eugene Teo
Cc: Roland McGrath
Cc: Oleg Nesterov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
Currently, there exists no method for a process to query the resource
limits of another process. They can be inferred via some mechanisms but
they cannot be explicitly determined. Given that this information can be
usefull to know during the debugging of an application, I've written this
patch which exports all of a processes limits via /proc//limits.Signed-off-by: Neil Horman
Cc: Oleg Nesterov
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
remove BITS_TO_TYPE macro
I realized, that it is actually the same as DIV_ROUND_UP, use it instead.
[akpm@linux-foundation.org: build fix]
Signed-off-by: Jiri Slaby
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
FlashPoint, use BIT instead of BITW
BITW was an ushort variant of BIT, use BIT instead
Signed-off-by: Jiri Slaby
Cc: James Bottomley
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds -
define global BIT macro
move all local BIT defines to the new globally define macro.
Signed-off-by: Jiri Slaby
Cc: Paul Mackerras
Cc: Benjamin Herrenschmidt
Cc: Kumar Gala
Cc: Dmitry Torokhov
Cc: Jeff Garzik
Cc: James Bottomley
Cc: "Antonino A. Daplas"
Cc: Russell King
Acked-by: Ralf Baechle
Cc: "John W. Linville"
Signed-off-by: Andrew Morton
Signed-off-by: Linus Torvalds
