linux-kernel - Re: [PATCH 2/2] perf scripts: Fix rwtop record script

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Message-ID: <51113018.80503@gmail.com>
Date:	Tue, 05 Feb 2013 09:15:20 -0700
From:	David Ahern <dsahern@...il.com>
To:	Jiri Olsa <jolsa@...hat.com>
CC:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Andrew Jones <drjones@...hat.com>
Subject: Re: [PATCH 2/2] perf scripts: Fix rwtop record script

On 2/5/13 9:05 AM, Jiri Olsa wrote:
> Adding -D option into the rwtop record command line, to get
> immediate response when there's event in the buffer.

Seems like this will dramatically increase CPU usage of perf-record as 
well as increase the overhead of each event with a process wakeup. How 
about a poll option on perf-record to have it wake up at a given rate 
instead?

David
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