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

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Message-Id: <8476E09F-D2DF-4685-A22F-0555475BD481@gmail.com>
Date:	Thu, 25 Apr 2013 11:18:17 +0300
From:	Alexey Lyahkov <alexey.lyashkov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	"Theodore Ts'o" <tytso@....edu>, Hugh Dickins <hughd@...gle.com>,
	Bernd Schubert <bernd.schubert@...tmail.fm>,
	Will Huck <will.huckk@...il.com>,
	Andrew Perepechko <anserper@...ru>, linux-ext4@...r.kernel.org,
	linux-mm@...ck.org, mgorman@...e.de
Subject: Re: page eviction from the buddy cache

So, right direction add ability to mark a page as active in lru pagevec array ?
just a bypass a IS_IN_LRU(page) check and fix moving to LRU to ability to put into active LRU list from pagevec ?
I may prepare a patch for it.

On Apr 25, 2013, at 00:41, Andrew Morton wrote:

> On Wed, 24 Apr 2013 10:26:50 -0400 "Theodore Ts'o" <tytso@....edu> wrote:
> 
>> On Tue, Apr 23, 2013 at 03:00:08PM -0700, Andrew Morton wrote:
>>> That should fix things for now.  Although it might be better to just do
>>> 
>>> 	mark_page_accessed(page);	/* to SetPageReferenced */
>>> 	lru_add_drain();		/* to SetPageLRU */
>>> 
>>> Because a) this was too early to decide that the page is
>>> super-important and b) the second touch of this page should have a
>>> mark_page_accessed() in it already.
>> 
>> The question is do we really want to put lru_add_drain() into the ext4
>> file system code?  That seems to pushing some fairly mm-specific
>> knowledge into file system code.  I'll do this if I have to do, but
>> wouldn't be better if this was pushed into mark_page_accessed(), or
>> some other new API was exported by the mm subsystem?
> 
> Sure, that would be daft.  We'd add a new
> mark_page_accessed_right_now_dont_use_this() to mm/swap.c
> 

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