Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
David Rientjes 89e8a244b9 cpusets: avoid looping when storing to mems_allowed if one node remains set ... {get,put}_mems_allowed() exist so that general kernel code may locklessly access a task's set of allowable nodes without having the chance that a concurrent write will cause the nodemask to be empty on configurations where MAX_NUMNODES > BITS_PER_LONG. This could incur a significant delay, however, especially in low memory conditions because the page allocator is blocking and reclaim requires get_mems_allowed() itself. It is not atypical to see writes to cpuset.mems take over 2 seconds to complete, for example. In low memory conditions, this is problematic because it's one of the most imporant times to change cpuset.mems in the first place! The only way a task's set of allowable nodes may change is through cpusets by writing to cpuset.mems and when attaching a task to a generic code is not reading the nodemask with get_mems_allowed() at the same time, and then clearing all the old nodes. This prevents the possibility that a reader will see an empty nodemask at the same time the writer is storing a new nodemask. If at least one node remains unchanged, though, it's possible to simply set all new nodes and then clear all the old nodes. Changing a task's nodemask is protected by cgroup_mutex so it's guaranteed that two threads are not changing the same task's nodemask at the same time, so the nodemask is guaranteed to be stored before another thread changes it and determines whether a node remains set or not. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Miao Xie <miaox@cn.fujitsu.com> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Nick Piggin <npiggin@kernel.dk> Cc: Paul Menage <paul@paulmenage.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2011-11-02 16:07:00 -07:00
..
debug	kgdb: follow rename pack_hex_byte() to hex_byte_pack()	2011-10-31 17:30:56 -07:00
events	mm: distinguish between mlocked and pinned pages	2011-10-31 17:30:46 -07:00
gcov	gcov: disable CONSTRUCTORS for UML	2011-07-26 16:49:45 -07:00
irq	Merge branch 'next/dt' of git://git.linaro.org/people/arnd/arm-soc	2011-11-01 21:02:35 -07:00
power	Merge branch 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm	2011-10-28 12:02:27 -07:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-10-26 17:15:03 +02:00
trace	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-10-26 17:03:38 +02:00
.gitignore
acct.c
async.c	async: uninitialized warning corrections	2011-09-15 14:22:28 +02:00
audit.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
audit.h
audit_tree.c	audit_tree,rcu: Convert call_rcu(__put_tree) to kfree_rcu()	2011-07-20 14:10:11 -07:00
audit_watch.c	kill path_lookup()	2011-03-14 09:15:23 -04:00
auditfilter.c	netlink: kill loginuid/sessionid/sid members from struct netlink_skb_parms	2011-03-03 10:55:40 -08:00
auditsc.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
backtracetest.c
bounds.c	memcg: remove direct page_cgroup-to-page pointer	2011-03-23 19:46:28 -07:00
capability.c	Merge branch 'master' into next	2011-05-19 18:51:57 +10:00
cgroup.c	cgroups: don't attach task to subsystem if migration failed	2011-11-02 16:06:59 -07:00
cgroup_freezer.c	cgroups: add per-thread subsystem callbacks	2011-05-26 17:12:34 -07:00
compat.c	Merge branch 'v4l_for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-2.6	2011-07-30 00:08:53 -07:00
configs.c	kernel/configs.c: include MODULE_*() when CONFIG_IKCONFIG_PROC=n	2011-07-25 20:57:15 -07:00
cpu.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
cpu_pm.c	cpu_pm: call notifiers during suspend	2011-09-23 12:05:29 +05:30
cpuset.c	cpusets: avoid looping when storing to mems_allowed if one node remains set	2011-11-02 16:07:00 -07:00
crash_dump.c	[S390] kdump: Add size to elfcorehdr kernel parameter	2011-10-30 15:16:41 +01:00
cred.c	Merge branch 'next' of git://selinuxproject.org/~jmorris/linux-security	2011-10-25 09:45:31 +02:00
delayacct.c	KVM: Steal time implementation	2011-07-14 12:59:14 +03:00
dma.c
elfcore.c
exec_domain.c
exit.c	oom: remove oom_disable_count	2011-10-31 17:30:45 -07:00
extable.c	extable, core_kernel_data(): Make sure all archs define _sdata	2011-05-20 08:56:56 +02:00
fork.c	oom: remove oom_disable_count	2011-10-31 17:30:45 -07:00
freezer.c	PM / Freezer: Make fake_signal_wake_up() wake TASK_KILLABLE tasks too	2011-10-16 23:30:37 +02:00
futex.c	Merge branch 'master' into for-next	2011-09-15 15:08:18 +02:00
futex_compat.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
groups.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
hrtimer.c	hrtimers: Fix typo causing erratic timers	2011-05-25 15:31:58 -07:00
hung_task.c	watchdog, hung_task_timeout: Add Kconfig configurable default	2011-04-28 09:13:17 +02:00
irq_work.c	llist: Add llist_next()	2011-10-04 12:43:53 +02:00
itimer.c
jump_label.c	jump_label: Fix jump_label update for modules	2011-06-29 09:59:17 -04:00
kallsyms.c	Merge branch 'core-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2011-03-25 17:52:22 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	arch:Kconfig.locks Remove unused config option.	2011-04-10 17:01:05 +02:00
Kconfig.preempt	sched: Isolate preempt counting in its own config option	2011-06-10 15:15:40 +02:00
kexec.c	[S390] kdump: Add infrastructure for unmapping crashkernel memory	2011-10-30 15:16:42 +01:00
kfifo.c
kmod.c	kmod: prevent kmod_loop_msg overflow in __request_module()	2011-10-26 13:10:39 +10:30
kprobes.c	locking, kprobes: Annotate the hash locks and kretprobe.lock as raw	2011-09-13 11:11:45 +02:00
ksysfs.c	kernel/ksysfs.c: expose file_caps_enabled in sysfs	2011-04-19 16:45:51 -07:00
kthread.c	cpuset: Fix cpuset_cpus_allowed_fallback(), don't update tsk->rt.nr_cpus_allowed	2011-05-28 17:02:57 +02:00
latencytop.c	locking, latencytop: Annotate latency_lock as raw	2011-09-13 11:12:02 +02:00
lockdep.c	Merge branch 'core-rcu-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-10-26 16:26:53 +02:00
lockdep_internals.h
lockdep_proc.c	lockdep: Remove unused 'factor' variable from lockdep_stats_show()	2011-03-23 13:54:47 +01:00
lockdep_states.h
Makefile	Merge branch 'devel-stable' of http://ftp.arm.linux.org.uk/pub/linux/arm/kernel/git-cur/linux-2.6-arm	2011-10-28 12:02:27 -07:00
module.c	Tracepoint: Dissociate from module mutex	2011-08-10 20:38:14 -04:00
mutex-debug.c	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex-debug.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
mutex.c	lockdep, mutex: provide mutex_lock_nest_lock	2011-05-25 08:39:17 -07:00
mutex.h	mutex: Use p->on_cpu for the adaptive spin	2011-04-14 08:52:33 +02:00
notifier.c	notifiers: sys: move reboot notifiers into reboot.h	2011-07-25 20:57:14 -07:00
nsproxy.c	make sure that nsproxy_cache is initialized early enough	2011-07-20 01:44:07 -04:00
padata.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
panic.c	panic: panic=-1 for immediate reboot	2011-07-26 16:49:45 -07:00
params.c	params: make dashes and underscores in parameter names truly equal	2011-10-26 13:10:39 +10:30
pid.c	rcu: Restore checks for blocking in RCU read-side critical sections	2011-09-28 21:36:37 -07:00
pid_namespace.c	pidns: call pid_ns_prepare_proc() from create_pid_namespace()	2011-03-23 19:46:58 -07:00
posix-cpu-timers.c	Merge branch 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-10-26 16:17:32 +02:00
posix-timers.c	posix-timers: RCU conversion	2011-05-24 12:10:51 +02:00
printk.c	printk: remove bounds checking for log_prefix	2011-10-31 17:30:53 -07:00
profile.c	kernel/profile.c: remove some duplicate code from profile_hits()	2011-05-26 17:12:37 -07:00
ptrace.c	ptrace: PTRACE_LISTEN forgets to unlock ->siglock	2011-09-25 11:02:00 -07:00
range.c
rcu.h	rcu: Add grace-period, quiescent-state, and call_rcu trace events	2011-09-28 21:38:21 -07:00
rcupdate.c	rcu: Add event-tracing for RCU callback invocation	2011-09-28 21:38:12 -07:00
rcutiny.c	rcu: Add grace-period, quiescent-state, and call_rcu trace events	2011-09-28 21:38:21 -07:00
rcutiny_plugin.h	rcu: Make TINY_RCU also use softirq for RCU_BOOST=n	2011-09-28 21:38:20 -07:00
rcutorture.c	rcu: Make rcu_torture_boost() exit loops at end of test	2011-09-28 21:38:46 -07:00
rcutree.c	rcu: Move propagation of ->completed from rcu_start_gp() to rcu_report_qs_rsp()	2011-09-28 21:38:49 -07:00
rcutree.h	rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states	2011-09-28 21:38:48 -07:00
rcutree_plugin.h	rcu: Remove rcu_needs_cpu_flush() to avoid false quiescent states	2011-09-28 21:38:48 -07:00
rcutree_trace.c	rcu: Simplify quiescent-state accounting	2011-09-28 21:38:22 -07:00
relay.c
res_counter.c	memcg: res_counter_read_u64(): fix potential races on 32-bit machines	2011-03-23 19:46:22 -07:00
resource.c	Resource: fix wrong resource window calculation	2011-09-29 20:04:34 -07:00
rtmutex-debug.c	rtmutex: Add missing rcu_read_unlock() in debug_rt_mutex_print_deadlock()	2011-10-05 13:20:24 +02:00
rtmutex-debug.h
rtmutex-tester.c	rtmutex: tester: Remove the remaining BKL leftovers	2011-02-22 22:07:22 +01:00
rtmutex.c	rcu: Permit rt_mutex_unlock() with irqs disabled	2011-09-28 21:38:43 -07:00
rtmutex.h
rtmutex_common.h	rtmutex: Simplify PI algorithm and make highest prio task get lock	2011-01-27 21:13:51 -05:00
rwsem.c	atomic: use <linux/atomic.h>	2011-07-26 16:49:47 -07:00
sched.c	Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2011-10-26 17:08:43 +02:00
sched_autogroup.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
sched_autogroup.h	sched: Skip autogroup when looking for all rt sched groups	2011-07-01 10:39:08 +02:00
sched_clock.c
sched_cpupri.c	sched/cpupri: Remove cpupri->pri_active	2011-08-14 12:01:11 +02:00
sched_cpupri.h	sched/cpupri: Remove cpupri->pri_active	2011-08-14 12:01:11 +02:00
sched_debug.c	sched: Get rid of lock_depth	2011-04-24 13:18:38 +02:00
sched_fair.c	sched: Wrap scheduler p->cpus_allowed access	2011-10-06 12:46:56 +02:00
sched_features.h	sched: Kill WAKEUP_PREEMPT	2011-08-14 12:00:41 +02:00
sched_idletask.c	sched: Drop the rq argument to sched_class::select_task_rq()	2011-04-14 08:52:36 +02:00
sched_rt.c	sched: Warn on rt throttling	2011-10-06 12:47:04 +02:00
sched_stats.h	locking, sched: Annotate thread_group_cputimer as raw	2011-09-13 11:11:55 +02:00
sched_stoptask.c	sched: Implement hierarchical task accounting for SCHED_OTHER	2011-08-14 12:01:13 +02:00
seccomp.c
semaphore.c	locking, semaphores: Annotate inner lock as raw	2011-09-13 11:11:57 +02:00
signal.c	user namespace: usb: make usb urbs user namespace aware (v2)	2011-09-29 13:13:08 -07:00
smp.c	generic-ipi: Fix kexec boot crash by initializing call_single_queue before enabling interrupts	2011-06-17 10:17:12 +02:00
softirq.c	softirq,rcu: Inform RCU of irq_exit() activity	2011-07-20 10:50:12 -07:00
spinlock.c
srcu.c
stacktrace.c	stack_trace: Add weak save_stack_trace_regs()	2011-06-14 22:48:52 -04:00
stop_machine.c	stop_machine: make stop_machine safe and efficient to call early	2011-10-31 17:30:53 -07:00
sys.c	Merge branch 'master' of ra.kernel.org:/pub/scm/linux/kernel/git/davem/net	2011-10-24 18:18:09 -04:00
sys_ni.c	Cross Memory Attach	2011-10-31 17:30:44 -07:00
sysctl.c	Merge branch 'akpm' (Andrew's incoming)	2011-10-31 17:46:07 -07:00
sysctl_binary.c	ipv4: NET_IPV4_ROUTE_GC_INTERVAL removal	2011-10-03 14:13:01 -04:00
sysctl_check.c	xfs: remove subdirectories	2011-08-12 16:21:35 -05:00
taskstats.c	Make TASKSTATS require root access	2011-09-19 17:04:37 -07:00
test_kprobes.c
time.c	time: Change jiffies_to_clock_t() argument type to unsigned long	2011-09-21 10:28:51 +02:00
timeconst.pl
timer.c	timers: Consider slack value in mod_timer()	2011-06-03 15:02:32 +02:00
tracepoint.c	Tracepoint: Dissociate from module mutex	2011-08-10 20:38:14 -04:00
tsacct.c	Make taskstats round statistics down to nearest 1k bytes/events	2011-09-19 17:10:57 -07:00
uid16.c	userns: user namespaces: convert several capable() calls	2011-03-23 19:47:08 -07:00
up.c
user-return-notifier.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
user.c	userns: add a user_namespace as creator/owner of uts_namespace	2011-03-23 19:46:59 -07:00
user_namespace.c
utsname.c	ns proc: Add support for the uts namespace	2011-05-10 14:35:35 -07:00
utsname_sysctl.c
wait.c	Fix common misspellings	2011-03-31 11:26:23 -03:00
watchdog.c	watchdog: move watchdog_*_all_cpus under CONFIG_SYSCTL	2011-10-31 17:30:53 -07:00
workqueue.c	workqueue: lock cwq access in drain_workqueue	2011-09-14 18:09:38 -07:00
workqueue_sched.h