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

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Message-Id: <128E4C4E-555C-43B6-9BA4-7914CBAF5B62@gmail.com>
Date:	Mon, 22 Apr 2013 15:14:55 +0300
From:	Alexey Lyahkov <alexey.lyashkov@...il.com>
To:	Theodore Ts'o <tytso@....edu>
Cc:	Bernd Schubert <bernd.schubert@...tmail.fm>,
	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

Theodore,

May you provide more details about discussion and new interface?
someone from mm think we need to implement mark_acccessed_force() with avoiding is in LRU checks?
and move single page directly without waiting a LRU drain ?


On Apr 21, 2013, at 02:57, Theodore Ts'o wrote:

> 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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