linux-kernel - Re: [PATCH] perf tools: fix write

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Message-ID: <1263998610.4283.1076.camel@laptop>
Date:	Wed, 20 Jan 2010 15:43:30 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Arnaldo Carvalho de Melo <acme@...radead.org>
Cc:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>,
	Ingo Molnar <mingo@...e.hu>, Paul Mackerras <paulus@...ba.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] perf tools: fix write_event()

On Wed, 2010-01-20 at 15:14 +0100, Peter Zijlstra wrote:

> > > > Uhm, how why? it didn't used to know about events and just copied the
> > > > data.
> > > 
> > > looks like acme wrecked it in f5a2c3dc.. anyway the fix is wrong, record
> > > should not know or care about the actual events and simply write data
> > > out.
> > 
> > Oh well, I guess then we should do that after record finishes,
> > reprocessing all the data in the file.
> 
> Why do we need it at all?

To clarify, we want to keep the record cycle as small/fast as possible
in order to minimize permutation of the system we're recording.

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