Messages in this thread Patch in this message | | | From | David Ahern <> | Subject | [PATCH] perf: Change log level for duration warning to INFO | Date | Mon, 1 Aug 2016 13:49:29 -0700 |
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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: David Ahern <dsa@cumulusnetworks.com> --- kernel/events/core.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 356a6c7cb52a..a19550d80ab1 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -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, -- 2.1.4
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