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

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Message-ID: <20100120140942.GP14636@ghostprotocols.net>
Date:	Wed, 20 Jan 2010 12:09:42 -0200
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Peter Zijlstra <peterz@...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()

Em Wed, Jan 20, 2010 at 02:44:56PM +0100, Peter Zijlstra escreveu:
> On Wed, 2010-01-20 at 14:41 +0100, Peter Zijlstra wrote:
> > On Wed, 2010-01-20 at 21:34 +0800, Xiao Guangrong wrote:
> > > We parse the event while it's read from mmap buffer in
> > > write_event(), but sometimes the event will straddles the
> > > mmap boundary, we should handle this case
> > > 
> > > And if we record events(such as perf kmem/sched) for long
> > > times, Ctrl + C can't interrupt it just for this reason
> > 
> > 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.

- Arnaldo
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