diff options
| author | Ingo Molnar <mingo@elte.hu> | 2005-09-07 00:16:27 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-08 01:57:17 +0200 |
| commit | 8446f1d391f3d27e6bf9c43d4cbcdac0ca720417 (patch) | |
| tree | 738853af877c9a391b4f2db467e7f90c6e2e38ed /arch | |
| parent | [PATCH] FUTEX_WAKE_OP: pthread_cond_signal() speedup (diff) | |
| download | linux-8446f1d391f3d27e6bf9c43d4cbcdac0ca720417.tar.xz linux-8446f1d391f3d27e6bf9c43d4cbcdac0ca720417.zip | |
[PATCH] detect soft lockups
This patch adds a new kernel debug feature: CONFIG_DETECT_SOFTLOCKUP.
When enabled then per-CPU watchdog threads are started, which try to run
once per second. If they get delayed for more than 10 seconds then a
callback from the timer interrupt detects this condition and prints out a
warning message and a stack dump (once per lockup incident). The feature
is otherwise non-intrusive, it doesnt try to unlock the box in any way, it
only gets the debug info out, automatically, and on all CPUs affected by
the lockup.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-Off-By: Matthias Urlichs <smurf@smurf.noris.de>
Signed-off-by: Richard Purdie <rpurdie@rpsys.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/i386/kernel/nmi.c | 5 | ||||
| -rw-r--r-- | arch/i386/kernel/time.c | 1 | ||||
| -rw-r--r-- | arch/x86_64/kernel/nmi.c | 2 | ||||
| -rw-r--r-- | arch/x86_64/kernel/time.c | 1 |
4 files changed, 9 insertions, 0 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index 8bbdbda07a2d..0178457db721 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -478,6 +478,11 @@ void touch_nmi_watchdog (void) */ for (i = 0; i < NR_CPUS; i++) alert_counter[i] = 0; + + /* + * Tickle the softlockup detector too: + */ + touch_softlockup_watchdog(); } extern void die_nmi(struct pt_regs *, const char *msg); diff --git a/arch/i386/kernel/time.c b/arch/i386/kernel/time.c index 6f794a78ee1e..b0c5ee2b3446 100644 --- a/arch/i386/kernel/time.c +++ b/arch/i386/kernel/time.c @@ -422,6 +422,7 @@ static int timer_resume(struct sys_device *dev) last_timer->resume(); cur_timer = last_timer; last_timer = NULL; + touch_softlockup_watchdog(); return 0; } diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c index 64a8e05d5811..84cae81fff8b 100644 --- a/arch/x86_64/kernel/nmi.c +++ b/arch/x86_64/kernel/nmi.c @@ -463,6 +463,8 @@ void touch_nmi_watchdog (void) */ for (i = 0; i < NR_CPUS; i++) per_cpu(nmi_touch, i) = 1; + + touch_softlockup_watchdog(); } void nmi_watchdog_tick (struct pt_regs * regs, unsigned reason) diff --git a/arch/x86_64/kernel/time.c b/arch/x86_64/kernel/time.c index 66bf6ddeb0c3..2b5d9da912a2 100644 --- a/arch/x86_64/kernel/time.c +++ b/arch/x86_64/kernel/time.c @@ -1041,6 +1041,7 @@ static int timer_resume(struct sys_device *dev) write_sequnlock_irqrestore(&xtime_lock,flags); jiffies += sleep_length; wall_jiffies += sleep_length; + touch_softlockup_watchdog(); return 0; } |