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| author | Ulrich Obergfell <uobergfe@redhat.com> | 2015-04-14 15:43:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-04-14 16:48:58 -0700 |
| commit | a0c9cbb93da9b9a0e00907a4a5d2e5f1fed86350 (patch) | |
| tree | 00fb4278d3c4716b9abcd9594fa493958691e069 /kernel | |
| parent | 84d56e66b9b4a646f04ec30696ca1aeea5e654d5 (diff) | |
| download | lwn-a0c9cbb93da9b9a0e00907a4a5d2e5f1fed86350.tar.gz lwn-a0c9cbb93da9b9a0e00907a4a5d2e5f1fed86350.zip | |
watchdog: introduce the proc_watchdog_update() function
This series introduces a separate handler for each watchdog parameter in
/proc/sys/kernel. The separate handlers need a common function that they
can call to update the run state of the lockup detectors, or to have the
lockup detectors use a new sample period.
Signed-off-by: Ulrich Obergfell <uobergfe@redhat.com>
Signed-off-by: Don Zickus <dzickus@redhat.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/watchdog.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c index 9a1c78769a33..dcc4990097a2 100644 --- a/kernel/watchdog.c +++ b/kernel/watchdog.c @@ -679,6 +679,29 @@ static void watchdog_disable_all_cpus(void) } /* + * Update the run state of the lockup detectors. + */ +static int proc_watchdog_update(void) +{ + int err = 0; + + /* + * Watchdog threads won't be started if they are already active. + * The 'watchdog_running' variable in watchdog_*_all_cpus() takes + * care of this. If those threads are already active, the sample + * period will be updated and the lockup detectors will be enabled + * or disabled 'on the fly'. + */ + if (watchdog_enabled && watchdog_thresh) + err = watchdog_enable_all_cpus(true); + else + watchdog_disable_all_cpus(); + + return err; + +} + +/* * proc handler for /proc/sys/kernel/nmi_watchdog,watchdog_thresh */ |