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authorFrederic Weisbecker <fweisbec@gmail.com>2013-07-23 02:31:06 +0200
committerIngo Molnar <mingo@kernel.org>2013-07-30 22:29:15 +0200
commit93786a5f6aeb9c032c1c240246c5aabcf457b38f (patch)
tree53699d7e0314a5c5e4acea146787a67d410a7a21 /kernel/watchdog.c
parentd84153d6c96f61aa06429586284639f32debf03e (diff)
downloadop-kernel-dev-93786a5f6aeb9c032c1c240246c5aabcf457b38f.zip
op-kernel-dev-93786a5f6aeb9c032c1c240246c5aabcf457b38f.tar.gz
watchdog: Make it work under full dynticks
A perf event can be used without forcing the tick to stay alive if it doesn't use a frequency but a sample period and if it doesn't throttle (raise storm of events). Since the lockup detector neither use a perf event frequency nor should ever throttle due to its high period, it can now run concurrently with the full dynticks feature. So remove the hack that disabled the watchdog. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Stephane Eranian <eranian@google.com> Cc: Don Zickus <dzickus@redhat.com> Cc: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Cc: Anish Singh <anish198519851985@gmail.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/1374539466-4799-9-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/watchdog.c')
-rw-r--r--kernel/watchdog.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 1241d8c..51c4f34 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -553,14 +553,6 @@ void __init lockup_detector_init(void)
{
set_sample_period();
-#ifdef CONFIG_NO_HZ_FULL
- if (watchdog_user_enabled) {
- watchdog_user_enabled = 0;
- pr_warning("Disabled lockup detectors by default for full dynticks\n");
- pr_warning("You can reactivate it with 'sysctl -w kernel.watchdog=1'\n");
- }
-#endif
-
if (watchdog_user_enabled)
watchdog_enable_all_cpus();
}
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