linux-kernel - Re: [PATCH 4/4] perf/x86/intel: Throttle PEBS events only from pmi

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Date:   Wed, 25 Jan 2017 14:02:54 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Jiri Olsa <jolsa@...nel.org>, lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andi Kleen <andi@...stfloor.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Vince Weaver <vince@...ter.net>
Subject: Re: [PATCH 4/4] perf/x86/intel: Throttle PEBS events only from pmi

On Tue, Jan 24, 2017 at 05:41:22PM +0100, Peter Zijlstra wrote:

SNIP

> ---
> diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
> index 1635c0c8df23..a95707a4140f 100644
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -1343,6 +1343,8 @@ void x86_pmu_stop(struct perf_event *event, int flags)
>  		cpuc->events[hwc->idx] = NULL;
>  		WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
>  		hwc->state |= PERF_HES_STOPPED;
> +	} else {
> +		hwc->state |= PERF_HES_ARCH;
>  	}
>  
>  	if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) {

I think that will work, I'll try to test it

jirka