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| author | Ingo Molnar <mingo@elte.hu> | 2008-05-12 21:21:04 +0200 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2008-05-25 06:34:44 +0200 |
| commit | 9c44bc03fff44ff04237a7d92e35304a0e50c331 (patch) | |
| tree | 64704ff78933a3a3bd8549801308d0557c02980d /kernel | |
| parent | 75d3bce2fc0a80f435fe12f2c9ed2632c8ac29e4 (diff) | |
| download | blackbird-op-linux-9c44bc03fff44ff04237a7d92e35304a0e50c331.tar.gz blackbird-op-linux-9c44bc03fff44ff04237a7d92e35304a0e50c331.zip | |
softlockup: allow panic on lockup
allow users to configure the softlockup detector to generate a panic
instead of a warning message.
high-availability systems might opt for this strict method (combined
with panic_timeout= boot option/sysctl), instead of generating
softlockup warnings ad infinitum.
also, automated tests work better if the system reboots reliably (into
a safe kernel) in case of a lockup.
The full spectrum of configurability is supported: boot option, sysctl
option and Kconfig option.
it's default-disabled.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/softlockup.c | 21 | ||||
| -rw-r--r-- | kernel/sysctl.c | 11 |
2 files changed, 32 insertions, 0 deletions
diff --git a/kernel/softlockup.c b/kernel/softlockup.c index 01b6522fd92b..78e0ad21cb0c 100644 --- a/kernel/softlockup.c +++ b/kernel/softlockup.c @@ -27,6 +27,21 @@ static DEFINE_PER_CPU(struct task_struct *, watchdog_task); static int __read_mostly did_panic; unsigned long __read_mostly softlockup_thresh = 60; +/* + * Should we panic (and reboot, if panic_timeout= is set) when a + * soft-lockup occurs: + */ +unsigned int __read_mostly softlockup_panic = + CONFIG_BOOTPARAM_SOFTLOCKUP_PANIC_VALUE; + +static int __init softlockup_panic_setup(char *str) +{ + softlockup_panic = simple_strtoul(str, NULL, 0); + + return 1; +} +__setup("softlockup_panic=", softlockup_panic_setup); + static int softlock_panic(struct notifier_block *this, unsigned long event, void *ptr) { @@ -120,6 +135,9 @@ void softlockup_tick(void) else dump_stack(); spin_unlock(&print_lock); + + if (softlockup_panic) + panic("softlockup: hung tasks"); } /* @@ -172,6 +190,9 @@ static void check_hung_task(struct task_struct *t, unsigned long now) t->last_switch_timestamp = now; touch_nmi_watchdog(); + + if (softlockup_panic) + panic("softlockup: blocked tasks"); } /* diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 29116652dca8..2d3b388c402d 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -729,6 +729,17 @@ static struct ctl_table kern_table[] = { #ifdef CONFIG_DETECT_SOFTLOCKUP { .ctl_name = CTL_UNNUMBERED, + .procname = "softlockup_panic", + .data = &softlockup_panic, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = &proc_doulongvec_minmax, + .strategy = &sysctl_intvec, + .extra1 = &zero, + .extra2 = &one, + }, + { + .ctl_name = CTL_UNNUMBERED, .procname = "softlockup_thresh", .data = &softlockup_thresh, .maxlen = sizeof(unsigned long), |
