linux-kernel - Re: [RFC GIT PULL] perf/trace/lock optimization/scalability improvements

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Message-ID: <20100210104915.GC5035@nowhere>
Date:	Wed, 10 Feb 2010 11:49:18 +0100
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Ingo Molnar <mingo@...e.hu>, LKML <linux-kernel@...r.kernel.org>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Paul Mackerras <paulus@...ba.org>,
	Hitoshi Mitake <mitake@....info.waseda.ac.jp>,
	Li Zefan <lizf@...fujitsu.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Jens Axboe <jens.axboe@...cle.com>
Subject: Re: [RFC GIT PULL] perf/trace/lock optimization/scalability
	improvements

On Sun, Feb 07, 2010 at 06:10:27PM +0100, Peter Zijlstra wrote:
> One thing we could do is add a PERF_TYPE_COLLECTION and have its read()
> method do something else than regular counters would, that way we can
> use read()/lseek()/stat() fd interface. The only trouble with that is
> that doesn't use the 'regular' output buffer.


But would be nice too. The drawback is indeed a separation/implementation
treatment against other events.


> /me goes try and come up with yet another solution..


Not sure there is another solution than the above or an inject/mmap
thing.

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