linux-kernel - Re: [PATCH 4/5] perf record: mmap output file

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Date:	Tue, 12 Nov 2013 22:11:21 +0100
From:	Ingo Molnar <mingo@...nel.org>
To:	David Ahern <dsahern@...il.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	linux-kernel@...r.kernel.org, jolsa@...hat.com,
	Frederic Weisbecker <fweisbec@...il.com>,
	Namhyung Kim <namhyung@...nel.org>,
	Mike Galbraith <efault@....de>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH 4/5] perf record: mmap output file - v5


* David Ahern <dsahern@...il.com> wrote:

> > Dunno.. it _should_ all work. Try it and see what it does.. Once the 
> > events are bigger than a page things might get 'interesting' though.

Which could be the case with call-graph recording, right?

> one option here is not allow page faults and system wide system calls. 
> system wide tracing needs mmap; page faults for a task can use write(). 
> I left that option in case something like this came up.

So maybe splice() sounds like the right long term solution after all? :-/

Thanks,

	Ingo
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