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| author | Don Zickus <dzickus@redhat.com> | 2010-05-07 17:11:51 -0400 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2010-05-12 23:55:55 +0200 |
| commit | d7c547335fa6b0090fa09c46ea0e965ac273a27e (patch) | |
| tree | 66d082cb7acbfc59a2af6bf24130d4832da2919e /kernel/watchdog.c | |
| parent | 10f9014912a2b1cb59c39cdea777e6d9afa8f17e (diff) | |
| download | lwn-d7c547335fa6b0090fa09c46ea0e965ac273a27e.tar.gz lwn-d7c547335fa6b0090fa09c46ea0e965ac273a27e.zip | |
lockup_detector: Separate touch_nmi_watchdog code path from touch_watchdog
When I combined the nmi_watchdog (hardlockup) and softlockup code, I
also combined the paths the touch_watchdog and touch_nmi_watchdog took.
This may not be the best idea as pointed out by Frederic W., that the
touch_watchdog case probably should not reset the hardlockup count.
Therefore the patch below falls back to the previous idea of keeping
the touch_nmi_watchdog a superset of the touch_watchdog case.
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Cc: Eric Paris <eparis@redhat.com>
Cc: Randy Dunlap <randy.dunlap@oracle.com>
LKML-Reference: <1273266711-18706-9-git-send-email-dzickus@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index f1541b7e3244..57b8e2c25eda 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -31,6 +31,7 @@ int watchdog_enabled; int __read_mostly softlockup_thresh = 60; static DEFINE_PER_CPU(unsigned long, watchdog_touch_ts); +static DEFINE_PER_CPU(bool, watchdog_nmi_touch); static DEFINE_PER_CPU(struct task_struct *, softlockup_watchdog); static DEFINE_PER_CPU(struct hrtimer, watchdog_hrtimer); static DEFINE_PER_CPU(bool, softlockup_touch_sync); @@ -139,6 +140,7 @@ void touch_all_softlockup_watchdogs(void) void touch_nmi_watchdog(void) { + __get_cpu_var(watchdog_nmi_touch) = true; touch_softlockup_watchdog(); } EXPORT_SYMBOL(touch_nmi_watchdog); @@ -201,10 +203,9 @@ void watchdog_overflow_callback(struct perf_event *event, int nmi, struct pt_regs *regs) { int this_cpu = smp_processor_id(); - unsigned long touch_ts = per_cpu(watchdog_touch_ts, this_cpu); - if (touch_ts == 0) { - __touch_watchdog(); + if (__get_cpu_var(watchdog_nmi_touch) == true) { + __get_cpu_var(watchdog_nmi_touch) = false; return; } |