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.
Signed-off-by: Frederic Weisbecker <fweis...@gmail.com>
Cc: Jiri Olsa <jo...@redhat.com>
Cc: Peter Zijlstra <pet...@infradead.org>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Ingo Molnar <mi...@kernel.org>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Stephane Eranian <eran...@google.com>
Cc: Don Zickus <dzic...@redhat.com>
Cc: Srivatsa S. Bhat <srivatsa.b...@linux.vnet.ibm.com>
Cc: Anish Singh <anish198519851...@gmail.com>
---
kernel/watchdog.c | 8 --------
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();
}
--
1.7.5.4
--
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