linux-kernel - Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

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Date:   Tue, 5 Sep 2017 18:03:41 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kan Liang <kan.liang@...el.com>,
        Dmitri Prokhorov <Dmitry.Prohorov@...el.com>,
        Valery Cherepennikov <valery.cherepennikov@...el.com>,
        Mark Rutland <mark.rutland@....com>,
        Stephane Eranian <eranian@...gle.com>,
        David Carrillo-Cisneros <davidcc@...gle.com>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vince Weaver <vince@...ter.net>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC][PATCH] perf: Rewrite enabled/running timekeeping

On Tue, Sep 05, 2017 at 03:06:26PM +0300, Alexey Budankov wrote:
> [ 6614.226305] WARNING: CPU: 45 PID: 43385 at kernel/events/core.c:239 event_function+0xb3/0xe0

I think I avoided that problem by not radically rewriting
perf_event_read() but fixing it instead:

  https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?h=perf/core&id=8ad650955ede95e4a6fd6afbda2a0b37d4af9c29

Full tree at:

  git://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git perf/core


Very minimally tested so far, I'll continue tomorrow.