linux-kernel - Re: System crash with perf

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Message-ID: <87zhrhzxpo.fsf@linux.intel.com>
Date:   Wed, 30 Jan 2019 12:39:47 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>,
        lkml <linux-kernel@...r.kernel.org>,
        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)

Jiri Olsa <jolsa@...hat.com> writes:
>
> the patch adds check_eriod pmu callback.. I need to check if there's
> better way to do this, but so far it fixes the crash for me
>
> if you guys could check this patch, that'd be great

There's already a limit_period callback, perhaps that could
be extended. But ok, can do it this way too.

I suspect there are some other cases that need this callback, not
just BTS, e.g. the checks in hsw_hw_config


-Andi