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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 2/3] vmscan: make mapped executable pages the first class citizen
Cc: kosaki.motohiro@jp.fujitsu.com,
       Christoph Lameter <cl@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       LKML <linux-kernel@vger.kernel.org>, Elladan <elladan@eskimo.com>,
       Nick Piggin <npiggin@suse.de>, Johannes Weiner <hannes@cmpxchg.org>,
       Peter Zijlstra <peterz@infradead.org>, Rik van Riel <riel@redhat.com>,
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       "minchan.kim@gmail.com" <minchan.kim@gmail.com>
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Date: Tue, 19 May 2009 17:06:35 +0900 (JST)
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> > > 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.