linux-kernel - Re: [PATCH 05/37] perf tools: Create separate mmap for dummy tracking event

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Message-ID: <CAM9d7cg1d4odzfqgPjsMpeFr1fiKV_0J+u0EOzCdKrGi9EMmxg@mail.gmail.com>
Date:	Sat, 27 Dec 2014 14:32:16 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jiri Olsa <jolsa@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Stephane Eranian <eranian@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <andi@...stfloor.org>,
	Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH 05/37] perf tools: Create separate mmap for dummy tracking event

On Sat, Dec 27, 2014 at 1:51 AM, David Ahern <dsahern@...il.com> wrote:
> On 12/24/14 12:15 AM, Namhyung Kim wrote:
>>
>> When multi file support is enabled, a dummy tracking event will be
>> used to track metadata (like task, comm and mmap events) for a session
>> and actual samples will be recorded in separate files.
>>
>> Provide separate mmap to the dummy tracking event.  The size is fixed
>> to 128KiB (+ 1 page) as the event rate will be lower than samples.  I
>
>
> Have you tried stress tests like a kernel compile with -j Ncpus (Ncpus = 16
> or higher)?

Yep, the test results in the cover letter were recorded kernel build
with -j 20 on my development machine.

Thanks,
Namhyung
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