linux-kernel - Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen

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Date:	Tue, 19 May 2009 17:06:35 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	Christoph Lameter <cl@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Elladan <elladan@...imo.com>, Nick Piggin <npiggin@...e.de>,
	Johannes Weiner <hannes@...xchg.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Rik van Riel <riel@...hat.com>,
	"tytso@....edu" <tytso@....edu>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"minchan.kim@...il.com" <minchan.kim@...il.com>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen

> > > Like the console mode, the absolute nr_mapped drops considerably - to 1/13 of
> > > the original size - during the streaming IO.
> > > 
> > > The delta of pgmajfault is 3 vs 107 during IO, or 236 vs 393 during the whole
> > > process.
> > 
> > hmmm.
> > 
> > about 100 page fault don't match Elladan's problem, I think.
> > perhaps We missed any addional reproduce condition?
> 
> Elladan's case is not the point of this test.
> Elladan's IO is use-once, so probably not a caching problem at all.
> 
> This test case is specifically devised to confirm whether this patch
> works as expected. Conclusion: it is.

Dejection ;-)

The number should address the patch is useful or not. confirming as expected
is not so great.
I don't think your patch is strange, but I really want to find reproduce way.



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