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

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Message-Id: <20090220093813.43EF.A69D9226@jp.fujitsu.com>
Date:	Fri, 20 Feb 2009 10:13:37 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Lee Schermerhorn <Lee.Schermerhorn@...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

> > > Currently, we can understand the amount of pagecache from "Cached"
> > > in /proc/meminfo. So I'd like to understand which files are using pagecache.
> > 
> > There is one meta question, Why do you think file-by-file pagecache
> > infomartion is valueable?
> 
> One might take a look at Marcello Tosatti's old 'vmtrace' patch.  It
> contains it's own data store/transport via relayfs, but the trace points
> could be ported to the current kernel tracing infrastructure.
> 
> Here's a starting point:   http://linux-mm.org/VmTrace
> 
> Quoting from that page:
> 
> >From the previous email to linux-mm:
> >"The sequence of pages which a given process or workload accesses
> >during its lifetime, a.k.a. "reference trace", is very important
> >information. It has been used in the past for comparison of page
> >replacement algorithms and other optimizations..."

Sure.
but strong difference exist.

vmtrace
  - can run standalone
  - reviewer can confirm its output result is useful or not.

Christoph also explained reason more kindly.
I think we need useful consumer. 


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