Commit c6db67cd authored by Peter Zijlstra's avatar Peter Zijlstra Committed by Ingo Molnar

watchdog: Don't throttle the watchdog

Stephane reported that when the machine locks up, the regular ticks,
which are responsible to resetting the throttle count, stop too.

Hence the NMI watchdog can end up being throttled before it reports on
the locked up state, and we end up being sad..

Cure this by having the watchdog overflow reset its own throttle count.
Reported-by: default avatarStephane Eranian <eranian@google.com>
Tested-by: default avatarStephane Eranian <eranian@google.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1282215916.1926.4696.camel@laptop>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent ede1b429
...@@ -206,6 +206,9 @@ void watchdog_overflow_callback(struct perf_event *event, int nmi, ...@@ -206,6 +206,9 @@ void watchdog_overflow_callback(struct perf_event *event, int nmi,
struct perf_sample_data *data, struct perf_sample_data *data,
struct pt_regs *regs) struct pt_regs *regs)
{ {
/* Ensure the watchdog never gets throttled */
event->hw.interrupts = 0;
if (__get_cpu_var(watchdog_nmi_touch) == true) { if (__get_cpu_var(watchdog_nmi_touch) == true) {
__get_cpu_var(watchdog_nmi_touch) = false; __get_cpu_var(watchdog_nmi_touch) = false;
return; return;
......
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