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

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Message-ID: <549D922F.3020101@gmail.com>
Date:	Fri, 26 Dec 2014 09:51:59 -0700
From:	David Ahern <dsahern@...il.com>
To:	Namhyung Kim <namhyung@...nel.org>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	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 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)?

David
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