linux-kernel - Re: [PATCH 2/3] mm, slub: count freed pages via rcu as this task's reclaimed

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Message-ID: <20130410052619.GD5872@lge.com>
Date:	Wed, 10 Apr 2013 14:26:19 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Mel Gorman <mgorman@...e.de>, Hugh Dickins <hughd@...gle.com>,
	Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan@...nel.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 2/3] mm, slub: count freed pages via rcu as this task's
 reclaimed_slab

Hello, Christoph.

On Tue, Apr 09, 2013 at 02:28:06PM +0000, Christoph Lameter wrote:
> On Tue, 9 Apr 2013, Joonsoo Kim wrote:
> 
> > Currently, freed pages via rcu is not counted for reclaimed_slab, because
> > it is freed in rcu context, not current task context. But, this free is
> > initiated by this task, so counting this into this task's reclaimed_slab
> > is meaningful to decide whether we continue reclaim, or not.
> > So change code to count these pages for this task's reclaimed_slab.
> 
> slab->reclaim_state guides the reclaim actions in vmscan.c. With this
> patch slab->reclaim_state could get quite a high value without new pages being
> available for allocation. slab->reclaim_state will only be updated
> when the RCU period ends.

Okay.

In addition, there is a little place who use SLAB_DESTROY_BY_RCU.
I will drop this patch[2/3] and [3/3] for next spin.

Thanks.

> 
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