From: Markus Trippelsdorf <markus@trippelsdorf.de>
To: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>
Subject: "perf: interrupt took too long" messages even with perf_cpu_time_max_percent==0
Date: Sat, 2 Apr 2016 11:32:39 +0200 [thread overview]
Message-ID: <20160402093239.GA305@x4> (raw)
Current git kernel sometimes shows:
perf: interrupt took too long (71 > 52), lowering kernel.perf_event_max_sample_rate to 300
perf: interrupt took too long (103 > 88), lowering kernel.perf_event_max_sample_rate to 300
perf: interrupt took too long (130 > 128), lowering kernel.perf_event_max_sample_rate to 300
perf: interrupt took too long (175 > 162), lowering kernel.perf_event_max_sample_rate to 300
perf: interrupt took too long (219 > 218), lowering kernel.perf_event_max_sample_rate to 300
...
when running e.g. "perf top" even when
/proc/sys/kernel/perf_cpu_time_max_percent is set to 0.
--
Markus
next reply other threads:[~2016-04-02 9:32 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-02 9:32 Markus Trippelsdorf [this message]
2016-04-02 11:00 ` "perf: interrupt took too long" messages even with perf_cpu_time_max_percent==0 Peter Zijlstra
2016-04-02 11:17 ` Markus Trippelsdorf
2016-04-02 11:23 ` Markus Trippelsdorf
2016-04-02 16:33 ` Peter Zijlstra
2016-04-13 10:03 ` Markus Trippelsdorf
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