Messages in this thread Patch in this message | | | From | Andy Lutomirski <> | Subject | [PATCH] events: Improve the "perf samples too long" warning | Date | Sat, 8 Mar 2014 10:02:33 -0800 |
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The warning is not indicative of an actual problem, especially when triggered by nmi_watchdog, so lower it to KERN_INFO. While I'm at it, clarify the message and reference the sysctl that controls it.
Signed-off-by: Andy Lutomirski <luto@amacapital.net> --- kernel/events/core.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index 56003c6..245bdc0 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -263,9 +263,8 @@ void perf_sample_event_took(u64 sample_len_ns) sysctl_perf_event_sample_rate = max_samples_per_tick * HZ; perf_sample_period_ns = NSEC_PER_SEC / sysctl_perf_event_sample_rate; - printk_ratelimited(KERN_WARNING - "perf samples too long (%lld > %lld), lowering " - "kernel.perf_event_max_sample_rate to %d\n", + printk_ratelimited(KERN_INFO + "perf samples are too slow for kernel.perf_cpu_time_max_percent (%lldns > %lldns); lowering kernel.perf_event_max_sample_rate to %d\n", avg_local_sample_len, allowed_ns, sysctl_perf_event_sample_rate); -- 1.8.5.3
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