linux-kernel - Re: System crash with perf

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Date:   Thu, 7 Mar 2019 00:09:53 +0100
From:   Pavel Machek <pavel@....cz>
To:     Andi Kleen <ak@...ux.intel.com>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        linux-perf-users@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        eranian@...gle.com, vincent.weaver@...ne.edu,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Subject: Re: System crash with perf_fuzzer (kernel: 5.0.0-rc3)

On Fri 2019-01-25 08:00:56, Andi Kleen wrote:
> > [Fri Jan 25 10:28:53 2019] perf: interrupt took too long (2501 > 2500), lowering kernel.perf_event_max_sample_rate to 79750
> > [Fri Jan 25 10:29:08 2019] perf: interrupt took too long (3136 > 3126), lowering kernel.perf_event_max_sample_rate to 63750
> > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (4140 > 3920), lowering kernel.perf_event_max_sample_rate to 48250
> > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (5231 > 5175), lowering kernel.perf_event_max_sample_rate to 38000
> > [Fri Jan 25 10:29:11 2019] perf: interrupt took too long (6736 > 6538), lowering kernel.perf_event_max_sample_rate to 29500
> 
> These are fairly normal.

Unfortunately, they are. Could we set up our defaults so that they
don't normally happen?

pavel@amd:~/g/unicsy_demo$ dmesg | grep "took too"
[  761.507893] perf: interrupt took too long (2516 > 2500), lowering
kernel.perf_event_max_sample_rate to 79250
[ 4736.674595] perf: interrupt took too long (3209 > 3145), lowering
kernel.perf_event_max_sample_rate to 62250
pavel@amd:~/g/unicsy_demo$


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