linux-kernel - Re: Why isn't shrink_slab more zone oriented ?

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Message-ID: <20110928000429.GD3159@dastard>
Date:	Wed, 28 Sep 2011 10:04:29 +1000
From:	Dave Chinner <david@...morbit.com>
To:	"kautuk.c @samsung.com" <consul.kautuk@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan.kim@...il.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: Why isn't shrink_slab more zone oriented ?

On Mon, Sep 26, 2011 at 05:21:12PM +0530, kautuk.c @samsung.com wrote:
> Hi,
> 
> I was going through the do_try_to_free_pages(), balance_pgdat(),
> __zone_reclaim()
> functions and I see that shrink_zone and shrink_slab are called for each zone.
> 
> But, shrink_slab() doesn't seem to bother about the zone from where it
> is freeing
> memory.

Work is in progress to do this.

http://lwn.net/Articles/456071/

Dirty slab objects are currently not tracked in a manner that makes
per-zone reclaim efficient to do, os that needs to be corrected
first.  Once we have generic per-zone LRU infrastructure, then we
can easily push zone reclaim hints down into the shrinkers for them
to scan the appropriate LRU....

Cheers,

Dave.
-- 
Dave Chinner
david@...morbit.com
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