Mandeep Singh Baines ce9dbe244b softlockup: check all tasks in hung_task ... Impact: extend the scope of hung-task checks Changed the default value of hung_task_check_count to PID_MAX_LIMIT. hung_task_batch_count added to put an upper bound on the critical section. Every hung_task_batch_count checks, the rcu lock is never held for a too long time. Keeping the critical section small minimizes time preemption is disabled and keeps rcu grace periods small. To prevent following a stale pointer, get_task_struct is called on g and t. To verify that g and t have not been unhashed while outside the critical section, the task states are checked. The design was proposed by Frédéric Weisbecker. Signed-off-by: Mandeep Singh Baines <msb@google.com> Suggested-by: Frédéric Weisbecker <fweisbec@gmail.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2009-02-05 19:54:57 +01:00
..
irq	async: Asynchronous function calls to speed up kernel boot	2009-01-07 08:45:46 -08:00
power	Merge branch 'linus' into release	2009-01-09 03:39:43 -05:00
time	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2009-01-07 11:31:52 -08:00
trace	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rric/oprofile	2009-01-09 12:43:06 -08:00
.gitignore	…
Kconfig.freezer	…
Kconfig.hz	…
Kconfig.preempt	…
Makefile	softlockup: decouple hung tasks check from softlockup detection	2009-01-16 14:06:04 +01:00
acct.c	…
async.c	async: fix __lowest_in_progress()	2009-01-12 16:39:58 -08:00
audit.c	…
audit.h	…
audit_tree.c	…
auditfilter.c	…
auditsc.c	…
backtracetest.c	…
bounds.c	…
capability.c	Merge branch 'next' into for-linus	2009-01-07 09:58:22 +11:00
cgroup.c	cgroups: add css_tryget()	2009-01-08 08:31:10 -08:00
cgroup_debug.c	…
cgroup_freezer.c	…
compat.c	Allow times and time system calls to return small negative values	2009-01-06 15:59:13 -08:00
configs.c	…
cpu.c	stop_machine/cpu hotplug: fix disable_nonboot_cpus	2009-01-07 11:36:14 -08:00
cpuset.c	cpuset: remove remaining pointers to cpumask_t	2009-01-08 08:31:11 -08:00
cred-internals.h	…
cred.c	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/security-testing-2.6	2009-01-09 13:59:25 -08:00
delayacct.c	…
dma-coherent.c	dma-coherent: catch oversized requests to dma_alloc_from_coherent()	2009-01-06 15:59:31 -08:00
dma.c	…
exec_domain.c	…
exit.c	mm: introduce get_mm_hiwater_xxx(), fix taskstats->hiwater_xxx accounting	2009-01-06 15:59:09 -08:00
extable.c	…
fork.c	softlockup: fix to allow compiling with !DETECT_HUNG_TASK	2009-01-16 18:17:34 +01:00
freezer.c	…
futex.c	Merge branches 'core/futexes', 'core/locking', 'core/rcu' and 'linus' into core/urgent	2009-01-06 09:32:11 +01:00
futex_compat.c	…
hrtimer.c	hrtimer: splitout peek ahead functionality, fix	2009-01-05 14:11:10 +01:00
hung_task.c	softlockup: check all tasks in hung_task	2009-02-05 19:54:57 +01:00
itimer.c	…
kallsyms.c	…
kexec.c	…
kfifo.c	…
kgdb.c	…
kmod.c	kmod: fix varargs kernel-doc	2009-01-06 15:59:27 -08:00
kprobes.c	kprobes: support probing module __init function	2009-01-06 15:59:21 -08:00
ksysfs.c	kernel/ksysfs.c:fix dependence on CONFIG_NET	2009-01-06 10:44:31 -08:00
kthread.c	…
latencytop.c	…
lockdep.c	…
lockdep_internals.h	…
lockdep_proc.c	…
marker.c	…
module.c	async: Asynchronous function calls to speed up kernel boot	2009-01-07 08:45:46 -08:00
mutex-debug.c	…
mutex-debug.h	…
mutex.c	…
mutex.h	…
notifier.c	…
ns_cgroup.c	ns_cgroup: remove unused spinlock	2009-01-08 08:31:02 -08:00
nsproxy.c	…
panic.c	oops: increment the oops UUID every time we oops	2009-01-06 15:59:12 -08:00
params.c	…
pid.c	pid: generalize task_active_pid_ns	2009-01-08 08:31:12 -08:00
pid_namespace.c	…
pm_qos_params.c	…
posix-cpu-timers.c	…
posix-timers.c	…
printk.c	trivial: printk: fix indentation of new_text_line declaration	2009-01-06 11:28:06 +01:00
profile.c	profile: don't include <asm/ptrace.h> twice.	2009-01-06 15:59:14 -08:00
ptrace.c	…
rcuclassic.c	rcu: add __cpuinit to rcu_init_percpu_data()	2009-01-14 11:26:40 +01:00
rcupdate.c	rcu: eliminate synchronize_rcu_xxx macro	2009-01-05 10:18:08 +01:00
rcupreempt.c	rcu: eliminate synchronize_rcu_xxx macro	2009-01-05 10:18:08 +01:00
rcupreempt_trace.c	…
rcutorture.c	rcu: fix bug in rcutorture system-shutdown code	2009-01-07 23:36:25 +01:00
rcutree.c	rcu: add __cpuinit to rcu_init_percpu_data()	2009-01-14 11:26:40 +01:00
rcutree_trace.c	…
relay.c	…
res_counter.c	memcg: memory cgroup resource counters for hierarchy	2009-01-08 08:31:05 -08:00
resource.c	resource: allow MMIO exclusivity for device drivers	2009-01-07 11:12:32 -08:00
rtmutex-debug.c	…
rtmutex-debug.h	…
rtmutex-tester.c	…
rtmutex.c	…
rtmutex.h	…
rtmutex_common.h	…
rwsem.c	…
sched.c	kernel/sched.c: add missing forward declaration for 'double_rq_lock'	2009-01-11 13:06:07 +01:00
sched_clock.c	…
sched_cpupri.c	sched: fix section mismatch	2009-01-06 11:07:15 +01:00
sched_cpupri.h	…
sched_debug.c	sched: partly revert "sched debug: remove NULL checking in print_cfs_rt_rq()"	2009-01-11 02:40:32 +01:00
sched_fair.c	generic swap(): sched: remove local swap() macro	2009-01-08 08:31:15 -08:00
sched_features.h	…
sched_idletask.c	…
sched_rt.c	…
sched_stats.h	…
seccomp.c	…
semaphore.c	…
signal.c	SEND_SIG_NOINFO: set si_pid to tgid instead of pid	2009-01-06 15:59:29 -08:00
smp.c	…
softirq.c	…
softlockup.c	softlockup: decouple hung tasks check from softlockup detection	2009-01-16 14:06:04 +01:00
spinlock.c	…
srcu.c	…
stacktrace.c	…
stop_machine.c	…
sys.c	Merge branch 'sched-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip	2009-01-06 17:10:33 -08:00
sys_ni.c	…
sysctl.c	softlockup: decouple hung tasks check from softlockup detection	2009-01-16 14:06:04 +01:00
sysctl_check.c	…
taskstats.c	…
test_kprobes.c	kprobes: add tests for register_kprobes	2009-01-06 15:59:20 -08:00
time.c	Allow times and time system calls to return small negative values	2009-01-06 15:59:13 -08:00
timeconst.pl	…
timer.c	…
tracepoint.c	…
tsacct.c	mm: introduce get_mm_hiwater_xxx(), fix taskstats->hiwater_xxx accounting	2009-01-06 15:59:09 -08:00
uid16.c	…
up.c	smp_call_function_single(): be slightly less stupid, fix #2	2009-01-12 16:04:37 +01:00
user.c	…
user_namespace.c	…
utsname.c	…
utsname_sysctl.c	…
wait.c	…
workqueue.c	…