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Date: Wed, 10 Feb 2010 11:49:18 +0100
From: Frederic Weisbecker <fweisbec@gmail.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>,
       Arnaldo Carvalho de Melo <acme@redhat.com>,
       Steven Rostedt <rostedt@goodmis.org>, Paul Mackerras <paulus@samba.org>,
       Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>,
       Li Zefan <lizf@cn.fujitsu.com>, Lai Jiangshan <laijs@cn.fujitsu.com>,
       Masami Hiramatsu <mhiramat@redhat.com>,
       Jens Axboe <jens.axboe@oracle.com>
Subject: Re: [RFC GIT PULL] perf/trace/lock optimization/scalability
	improvements
Message-ID: <20100210104915.GC5035@nowhere>
References: <1265188475-23509-1-git-send-regression-fweisbec@gmail.com> <1265193196.24455.390.camel@laptop> <20100203220735.GD5068@nowhere> <1265562627.12224.99.camel@laptop>
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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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