linux-kernel - Re: Perf and ftrace [was Re: PyTimechart]

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Message-ID: <1273690012.27703.38.camel@gandalf.stny.rr.com>
Date:	Wed, 12 May 2010 14:46:52 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Pierre Tardy <tardyp@...il.com>, Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-kernel@...r.kernel.org, arjan@...radead.org,
	ziga.mahkovec@...il.com, davem <davem@...emloft.net>
Subject: Re: Perf and ftrace [was Re: PyTimechart]

On Wed, 2010-05-12 at 14:37 -0400, Mathieu Desnoyers wrote:

> OK, I see. In LTTng, I dropped the mmap() support when I integrated splice(). In
> both case, I can share the pages between the "output" (mmap or splice) and the
> ring buffer because my ring buffer does not care about
> page->mapping/->index/etc, so I never have to swap them.

I'm curious, how do you handle the overwrite mode without swapping?

-- Steve


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