diff options
| author | Ulrich Obergfell <uobergfe@redhat.com> | 2015-09-04 15:45:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-04 16:54:41 -0700 |
| commit | d4bdd0b21c7652a8271f873cc755486b255c1bbd (patch) | |
| tree | e7bc5013630c373ceb129c08018cd15578faa3ab /kernel/watchdog.c | |
| parent | 8c073d27d7ad293bf734cc8475689413afadab81 (diff) | |
watchdog: use park/unpark functions in update_watchdog_all_cpus()
Remove update_watchdog() and restart_watchdog_hrtimer() since these
functions are no longer needed. Changes of parameters such as the sample
period are honored at the time when the watchdog threads are being
unparked.
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
Reviewed-by: Aaron Tomlin <atomlin@redhat.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Ulrich Obergfell <uobergfe@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Stephane Eranian <eranian@google.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel/watchdog.c')
| -rw-r--r-- | kernel/watchdog.c | 40 |
1 files changed, 2 insertions, 38 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index e6eb5b697212..eb8f94b50101 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -745,46 +745,10 @@ void watchdog_resume(void) mutex_unlock(&watchdog_proc_mutex); } -static void restart_watchdog_hrtimer(void *info) -{ - struct hrtimer *hrtimer = raw_cpu_ptr(&watchdog_hrtimer); - int ret; - - /* - * No need to cancel and restart hrtimer if it is currently executing - * because it will reprogram itself with the new period now. - * We should never see it unqueued here because we are running per-cpu - * with interrupts disabled. - */ - ret = hrtimer_try_to_cancel(hrtimer); - if (ret == 1) - hrtimer_start(hrtimer, ns_to_ktime(sample_period), - HRTIMER_MODE_REL_PINNED); -} - -static void update_watchdog(int cpu) -{ - /* - * Make sure that perf event counter will adopt to a new - * sampling period. Updating the sampling period directly would - * be much nicer but we do not have an API for that now so - * let's use a big hammer. - * Hrtimer will adopt the new period on the next tick but this - * might be late already so we have to restart the timer as well. - */ - watchdog_nmi_disable(cpu); - smp_call_function_single(cpu, restart_watchdog_hrtimer, NULL, 1); - watchdog_nmi_enable(cpu); -} - static void update_watchdog_all_cpus(void) { - int cpu; - - get_online_cpus(); - for_each_watchdog_cpu(cpu) - update_watchdog(cpu); - put_online_cpus(); + watchdog_park_threads(); + watchdog_unpark_threads(); } static int watchdog_enable_all_cpus(void) |