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Date: Wed, 18 Feb 2009 09:29:04 +0900 (JST) From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> To: Frederic Weisbecker <fweisbec@...il.com> Cc: kosaki.motohiro@...fujitsu.com, Atsushi Tsuji <a-tsuji@...jp.nec.com>, Peter Zijlstra <peterz@...radead.org>, 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> Subject: Re: [PATCH] Add tracepoints to track pagecache transition Hi Frederic, > > And, both function is freqentlly called one. > > I worry about performance issue. can you prove no degression? > > It would be very hard to prove. Tracepoints are very cheap in that they only > add the overhead of a single branch check while off. this is typical reviewing comment. Memory folks adage says, Don't believe theory, you believe benchmark result. I don't oppose your theorical background opinion :) > But are there some plans about writing a tracer or so for pagecache? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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