linux-kernel - Re: [PATCH v1 1/2] perf/core: Use sysctl to turn on/off dropping leaked kernel samples

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Date:   Mon, 18 Jun 2018 12:51:02 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Mark Rutland <mark.rutland@....com>, yao.jin@...ux.intel.com,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Kyle Huey <me@...ehuey.com>,
        Linux Kernel Mailing List <Linux-kernel@...r.kernel.org>,
        Vince Weaver <vincent.weaver@...ne.edu>,
        Will Deacon <will.deacon@....com>,
        Stephane Eranian <eranian@...gle.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        "Liang, Kan" <kan.liang@...el.com>, yao.jin@...el.com
Subject: Re: [PATCH v1 1/2] perf/core: Use sysctl to turn on/off dropping
 leaked kernel samples

On Sat, Jun 16, 2018 at 10:27:27AM +0900, Linus Torvalds wrote:
> On Fri, Jun 15, 2018 at 8:36 PM Mark Rutland <mark.rutland@....com> wrote:
> >
> > At least for sampling the GPRs, we could do something like below
> > unconditionally, which seems sufficient for my test cases.
> 
> Ack.
> 
> The PEBS case may need checking, but maybe PEBS doesn't even have this issue?

Sadly PEBS is susceptible as well, but the proposed patch actually works
for that as well.