linux-ext4 - Re: page eviction from the buddy cache

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Message-ID: <20130420235718.GA28789@thunk.org>
Date:	Sat, 20 Apr 2013 19:57:18 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Bernd Schubert <bernd.schubert@...tmail.fm>
Cc:	Alexey Lyahkov <alexey.lyashkov@...il.com>,
	Will Huck <will.huckk@...il.com>,
	Hugh Dickins <hughd@...gle.com>,
	Andrew Perepechko <anserper@...ru>, linux-ext4@...r.kernel.org,
	akpm@...ux-foundation.org, linux-mm@...ck.org, mgorman@...e.de
Subject: Re: page eviction from the buddy cache

On Sat, Apr 20, 2013 at 11:18:17PM +0200, Bernd Schubert wrote:
> Alex, Andrew,
> 
> did you notice the patch Ted just sent?
> ("ext4: mark all metadata I/O with REQ_META")

This patch was sent to fix another issue that was brought up at Linux
Storage, Filesystem, and MM workshop.  I did bring up this issue with
Mel Gorman while at LSF/MM, and as a result, tThe mm folks are going
to look into making mark_page_accessed() do the right thing, or
perhaps provide us with new interface.  The problem with forcing the
page to be marked as activated is this would cause a TLB flush, which
would be pointless since this these buddy bitmap pages aren't actually
mapped in anywhere.

						- Ted
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