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Date:   Mon, 18 Jun 2018 12:51:02 +0200
From:   Peter Zijlstra <peterz@infradead.org>
To:     Linus Torvalds <torvalds@linux-foundation.org>
Cc:     Mark Rutland <mark.rutland@arm.com>, yao.jin@linux.intel.com,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Jiri Olsa <jolsa@kernel.org>, Ingo Molnar <mingo@redhat.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Kyle Huey <me@kylehuey.com>,
        Linux Kernel Mailing List <Linux-kernel@vger.kernel.org>,
        Vince Weaver <vincent.weaver@maine.edu>,
        Will Deacon <will.deacon@arm.com>,
        Stephane Eranian <eranian@google.com>,
        Namhyung Kim <namhyung@kernel.org>,
        Andi Kleen <ak@linux.intel.com>,
        "Liang, Kan" <kan.liang@intel.com>, yao.jin@intel.com
Subject: Re: [PATCH v1 1/2] perf/core: Use sysctl to turn on/off dropping
 leaked kernel samples
Message-ID: <20180618105102.GJ2458@hirez.programming.kicks-ass.net>
References: <1529057003-2212-1-git-send-email-yao.jin@linux.intel.com>
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 <20180615113608.6m74sm7gpl5p6oqe@lakrids.cambridge.arm.com>
 <CA+55aFwRC6gszsHsGcOonV5SHDb7SxWKWbMQsTZ7KD85G_SnLQ@mail.gmail.com>
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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@arm.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.