From: David Ahern Date: Mon, 1 Aug 2016 20:49:29 +0000 (-0700) Subject: perf/core: Change log level for duration warning to KERN_INFO X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=0d87d7ec22a0879d3926faa4f4f4412a5dee1fba;p=openwrt%2Fstaging%2Fblogic.git 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: David Ahern Cc: Alexander Shishkin Cc: Arnaldo Carvalho de Melo Cc: Jiri Olsa Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Link: http://lkml.kernel.org/r/1470084569-438-1-git-send-email-dsa@cumulusnetworks.com Signed-off-by: Ingo Molnar --- 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,