summaryrefslogtreecommitdiffstats
path: root/kernel
diff options
context:
space:
mode:
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
parentd84153d6c96f61aa06429586284639f32debf03e (diff)
downloadlinux-93786a5f6aeb9c032c1c240246c5aabcf457b38f.tar.gz
linux-93786a5f6aeb9c032c1c240246c5aabcf457b38f.tar.bz2
linux-93786a5f6aeb9c032c1c240246c5aabcf457b38f.zip
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')
-rw-r--r--kernel/watchdog.c8
1 files changed, 0 insertions, 8 deletions
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 1241d8c91d5e..51c4f34d258e 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();
}