linux-kernel - Re: [PATCH] Add tracepoints to track pagecache transition

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Message-Id: <1234871651.4744.89.camel@laptop>
Date:	Tue, 17 Feb 2009 12:54:11 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Atsushi Tsuji <a-tsuji@...jp.nec.com>,
	linux-kernel@...r.kernel.org, Jason Baron <jbaron@...hat.com>,
	Ingo Molnar <mingo@...e.hu>,
	Mathieu Desnoyers <compudj@...stal.dyndns.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Kazuto Miyoshi <miyoshi@...ux.bs1.fc.nec.co.jp>,
	rostedt@...dmis.org, linux-mm <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Hugh Dickins <hugh@...itas.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Subject: Re: [PATCH] Add tracepoints to track pagecache transition

On Tue, 2009-02-17 at 20:38 +0900, KOSAKI Motohiro wrote:
> If you want to see I/O activity, you need to add tracepoint into block
> layer.

We already have that, Arnaldo converted blktrace to use tracepoints and
wrote an ftrace tracer for it.

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