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Commit 0d87d7ec authored by David Ahern's avatar David Ahern Committed by Ingo Molnar
Browse files

perf/core: Change log level for duration warning to KERN_INFO 



When the perf interrupt handler exceeds a threshold warning messages
are displayed on console:

  [12739.31793] perf interrupt took too long (2504 > 2500), lowering kernel.perf_event_max_sample_rate to 50000
  [71340.165065] perf interrupt took too long (5005 > 5000), lowering kernel.perf_event_max_sample_rate to 25000

Many customers and users are confused by the message wondering if
something is wrong or they need to take action to fix a problem.
Since a user can not do anything to fix the issue, the message is really
more informational than a warning. Adjust the log level accordingly.

Signed-off-by: default avatarDavid Ahern <dsa@cumulusnetworks.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/1470084569-438-1-git-send-email-dsa@cumulusnetworks.com


Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
parent 005bd007

kernel/events/core.c

+1 −1
Original line number Diff line number Diff line
@@ -448,7 +448,7 @@ static u64 __report_allowed; 


static void perf_duration_warn(struct irq_work *w)

{

	printk_ratelimited(KERN_WARNING

	printk_ratelimited(KERN_INFO

		"perf: interrupt took too long (%lld > %lld), lowering "

		"kernel.perf_event_max_sample_rate to %d\n",

		__report_avg, __report_allowed,