Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Lai Jiangshan ee378aa49b workqueue: fix possible idle worker depletion across CPU hotplug ... To simplify both normal and CPU hotplug paths, worker management is prevented while CPU hoplug is in progress. This is achieved by CPU hotplug holding the same exclusion mechanism used by workers to ensure there's only one manager per pool. If someone else seems to be performing the manager role, workers proceed to execute work items. CPU hotplug using the same mechanism can lead to idle worker depletion because all workers could proceed to execute work items while CPU hotplug is in progress and CPU hotplug itself wouldn't actually perform the worker management duty - it doesn't guarantee that there's an idle worker left when it releases management. This idle worker depletion, under extreme circumstances, can break forward-progress guarantee and thus lead to deadlock. This patch fixes the bug by using separate mechanisms for manager exclusion among workers and hotplug exclusion. For manager exclusion, POOL_MANAGING_WORKERS which was restored by the previous patch is used. pool->manager_mutex is now only used for exclusion between the elected manager and CPU hotplug. The elected manager won't proceed without holding pool->manager_mutex. This ensures that the worker which won the manager position can't skip managing while CPU hotplug is in progress. It will block on manager_mutex and perform management after CPU hotplug is complete. Note that hotplug may happen while waiting for manager_mutex. A manager isn't either on idle or busy list and thus the hoplug code can't unbind/rebind it. Make the manager handle its own un/rebinding. tj: Updated comment and description. Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com> Signed-off-by: Tejun Heo <tj@kernel.org>		2012-09-10 10:05:54 -07:00
..
debug	kdb: Switch to nolock variants of kmsg_dump functions	2012-07-21 10:34:00 -07:00
events	uprobes: __replace_page() needs munlock_vma_page()	2012-07-30 11:27:25 +02:00
gcov
irq	irqdomain changes for Linux v3.6	2012-07-31 20:44:03 -07:00
power	NMI watchdog: fix for lockup detector breakage on resume	2012-07-30 17:25:13 -07:00
sched	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-07-31 15:34:13 -07:00
time	Merge branch 'timers-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-07-22 11:35:46 -07:00
trace	Staging tree patches for 3.6-rc1	2012-07-26 11:14:49 -07:00
.gitignore
acct.c
async.c	[SCSI] async: make async_synchronize_full() flush all work regardless of domain	2012-07-20 09:07:37 +01:00
audit.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
audit.h
audit_tree.c	VFS: Make clone_mnt()/copy_tree()/collect_mounts() return errors	2012-07-14 16:37:27 +04:00
audit_watch.c	get rid of kern_path_parent()	2012-07-14 16:35:02 +04:00
auditfilter.c
auditsc.c	seccomp: remove duplicated failure logging	2012-04-14 11:13:20 +10:00
backtracetest.c
bounds.c
capability.c	userns: Teach inode_capable to understand inodes whose uids map to other namespaces.	2012-05-15 14:59:24 -07:00
cgroup.c	Merge branch 'for-3.6' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2012-07-24 17:47:44 -07:00
cgroup_freezer.c	cgroup: convert all non-memcg controllers to the new cftype interface	2012-04-01 12:09:55 -07:00
compat.c	new helper: sigsuspend()	2012-05-21 23:52:30 -04:00
configs.c
cpu.c	mm/hotplug: correctly setup fallback zonelists when creating new pgdat	2012-07-31 18:42:44 -07:00
cpu_pm.c	kernel/cpu_pm.c: fix various typos	2012-05-31 17:49:27 -07:00
cpuset.c	cpusets: Remove/update outdated comments	2012-07-24 13:53:28 +02:00
crash_dump.c
cred.c	keys: kill task_struct->replacement_session_keyring	2012-05-23 22:11:41 -04:00
delayacct.c
dma.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
elfcore.c
exec_domain.c
exit.c	posix_types.h: Cleanup stale __NFDBITS and related definitions	2012-07-26 13:36:43 -07:00
extable.c	extable: Skip sorting if sorted at build time.	2012-04-19 15:06:55 -07:00
fork.c	memcg: rename config variables	2012-07-31 18:42:43 -07:00
freezer.c
futex.c	futex: Mark get_robust_list as deprecated	2012-03-29 11:37:17 +02:00
futex_compat.c	futex: Mark get_robust_list as deprecated	2012-03-29 11:37:17 +02:00
groups.c	userns: Convert in_group_p and in_egroup_p to use kgid_t	2012-05-03 03:29:33 -07:00
hrtimer.c	hrtimer: Update hrtimer base offsets each hrtimer_interrupt	2012-07-11 23:34:39 +02:00
hung_task.c	hung task debugging: Inject NMI when hung and going to panic	2012-04-25 12:39:25 +02:00
irq_work.c	irq_work: fix compile failure on tile from missing include	2012-04-13 13:15:16 -04:00
itimer.c	itimer: Use printk_once instead of WARN_ONCE	2012-04-10 11:00:30 +02:00
jump_label.c
kallsyms.c	vsprintf: fix %ps on non symbols when using kallsyms	2012-05-29 16:22:32 -07:00
kcmp.c	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
Kconfig.preempt	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
kexec.c	kdump: append newline to the last lien of vmcoreinfo note	2012-07-30 17:25:20 -07:00
kfifo.c	[media] kernel:kfifo: export __kfifo_max_r symbol	2012-04-11 18:24:37 -03:00
kmod.c	kmod: avoid deadlock from recursive kmod call	2012-07-30 17:25:20 -07:00
kprobes.c
ksysfs.c
kthread.c	kthread_worker: reimplement flush_kthread_work() to allow freeing the work item being executed	2012-07-22 10:15:28 -07:00
latencytop.c
lglock.c	brlocks/lglocks: turn into functions	2012-05-29 23:28:41 -04:00
lockdep.c
lockdep_internals.h
lockdep_proc.c
lockdep_states.h
Makefile	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-06-01 10:34:35 -07:00
module.c	Guard check in module loader against integer overflow	2012-05-23 22:28:53 +09:30
mutex-debug.c
mutex-debug.h
mutex.c
mutex.h
notifier.c
nsproxy.c
padata.c	padata: Fix cpu hotplug	2012-03-29 19:52:46 +08:00
panic.c	panic: fix a possible deadlock in panic()	2012-07-30 17:25:13 -07:00
params.c	params: replace printk(KERN_<LVL>...) with pr_<lvl>(...)	2012-05-04 17:28:18 -07:00
pid.c	mm: add a low limit to alloc_large_system_hash	2012-05-24 00:28:21 -04:00
pid_namespace.c	pidns: guarantee that the pidns init will be the last pidns process reaped	2012-06-20 14:39:36 -07:00
posix-cpu-timers.c
posix-timers.c
printk.c	printk: only look for prefix levels in kernel messages	2012-07-30 17:25:14 -07:00
profile.c
ptrace.c	userns: Convert ptrace, kill, set_priority permission checks to work with kuids and kgids	2012-05-03 03:28:51 -07:00
range.c
rcu.h
rcupdate.c	rcu: Consolidate tree/tiny __rcu_read_{,un}lock() implementations	2012-07-02 12:34:23 -07:00
rcutiny.c	rcu: Fix rcu_is_cpu_idle() #ifdef in TINY_RCU	2012-07-02 12:34:25 -07:00
rcutiny_plugin.h	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutorture.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
rcutree.c	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutree.h	Merge branches 'bigrtm.2012.07.04a', 'doctorture.2012.07.02a', 'fixes.2012.07.06a' and 'fnh.2012.07.02a' into HEAD	2012-07-06 05:59:30 -07:00
rcutree_plugin.h	rcu: Fix code-style issues involving "else"	2012-07-06 06:01:48 -07:00
rcutree_trace.c	rcu: Fix broken strings in RCU's source code.	2012-07-06 06:01:49 -07:00
relay.c	splice: fix racy pipe->buffers uses	2012-06-13 21:16:42 +02:00
res_counter.c	rescounters: add res_counter_uncharge_until()	2012-05-29 16:22:27 -07:00
resource.c	resource: make sure requested range is included in the root range	2012-07-30 17:25:21 -07:00
rtmutex-debug.c
rtmutex-debug.h
rtmutex-tester.c
rtmutex.c
rtmutex.h
rtmutex_common.h
rwsem.c	Remove all #inclusions of asm/system.h	2012-03-28 18:30:03 +01:00
seccomp.c	seccomp: fix build warnings when there is no CONFIG_SECCOMP_FILTER	2012-04-18 12:24:52 +10:00
semaphore.c	semaphore: fix improper comment reference to mutex	2012-04-05 17:15:55 -07:00
signal.c	signal: make sure we don't get stopped with pending task_work	2012-07-22 23:57:54 +04:00
smp.c	smp: Remove ipi_call_lock[_irq]()/ipi_call_unlock[_irq]()	2012-06-05 17:27:14 +02:00
smpboot.c	smpboot, idle: Fix comment mismatch over idle_threads_init()	2012-05-24 22:58:08 +02:00
smpboot.h	smpboot: Remove leftover declaration	2012-06-11 15:07:52 +02:00
softirq.c	mm: allow PF_MEMALLOC from softirq context	2012-07-31 18:42:45 -07:00
spinlock.c	locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage	2012-03-23 13:18:57 +01:00
srcu.c	rcu: Implement per-domain single-threaded call_srcu() state machine	2012-04-30 10:48:25 -07:00
stacktrace.c
stop_machine.c
sys.c	kernel/sys.c: avoid argv_free(NULL)	2012-07-30 17:25:13 -07:00
sys_ni.c	syscalls, x86: add __NR_kcmp syscall	2012-05-31 17:49:32 -07:00
sysctl.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2012-08-01 10:26:23 -07:00
sysctl_binary.c	mm: prepare for removal of obsolete /proc/sys/vm/nr_pdflush_threads	2012-07-31 18:42:40 -07:00
task_work.c	deal with task_work callbacks adding more work	2012-07-22 23:57:57 +04:00
taskstats.c	taskstats: check nla_reserve() return	2012-07-30 17:25:21 -07:00
test_kprobes.c
time.c	time: Remove bogus comments	2012-03-15 18:17:55 -07:00
timeconst.pl
timer.c	timers: Improve get_next_timer_interrupt()	2012-06-06 13:49:02 +02:00
tracepoint.c
tsacct.c
uid16.c	userns: Convert setting and getting uid and gid system calls to use kuid and kgid	2012-05-03 03:28:41 -07:00
up.c
user-return-notifier.c
user.c	userns: Silence silly gcc warning.	2012-05-19 15:44:40 -06:00
user_namespace.c	userns: Store uid and gid values in struct cred with kuid_t and kgid_t types	2012-05-03 03:28:38 -07:00
utsname.c	userns: Use cred->user_ns instead of cred->user->user_ns	2012-04-07 16:55:51 -07:00
utsname_sysctl.c
wait.c
watchdog.c	NMI watchdog: fix for lockup detector breakage on resume	2012-07-30 17:25:13 -07:00
workqueue.c	workqueue: fix possible idle worker depletion across CPU hotplug	2012-09-10 10:05:54 -07:00
workqueue_sched.h