linux-kernel - Re: [PATCHv2 00/25] perf tool: Add support for multiple data file storage

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Date:	Mon, 09 Sep 2013 07:11:11 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCHv2 00/25] perf tool: Add support for multiple data file
 storage

On 9/9/13 7:03 AM, Jiri Olsa wrote:
> my usage currently is to having this running during the day:
> (well whenever I remember to run it.. ;-) )
>
>    [jolsa@...va perf]$ sudo ./perf record -g -M 1m -a
>
> and checking report when the system or app get stuck
>
> with multiple files I can just easily (or automaticaly)
> remove old ones without restarting session

Aren't you losing potentially important events by doing that -- FORK, 
COMM, MMAP?

I have a flight recorder style command that address this problem 
(long-running/daemons) by processing task events and then stashing the 
sample events on a time-ordered list with chopping to maintain the time 
window.

David
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