linux-kernel - Re: [PATCH 2/3] fs/superblock: Avoid locking counting inodes and dentries before reclaiming them

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Message-ID: <537E1EE6.8080102@redhat.com>
Date:	Thu, 22 May 2014 11:59:34 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mgorman@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>
CC:	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Tim Chen <tim.c.chen@...ux.intel.com>,
	Dave Chinner <david@...morbit.com>,
	Yuanhan Liu <yuanhan.liu@...ux.intel.com>,
	Bob Liu <bob.liu@...cle.com>, Jan Kara <jack@...e.cz>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Linux-FSDevel <linux-fsdevel@...r.kernel.org>
Subject: Re: [PATCH 2/3] fs/superblock: Avoid locking counting inodes and
 dentries before reclaiming them

On 05/22/2014 05:09 AM, Mel Gorman wrote:
> From: Tim Chen <tim.c.chen@...ux.intel.com>
> 
> We remove the call to grab_super_passive in call to super_cache_count.
> This becomes a scalability bottleneck as multiple threads are trying to do
> memory reclamation, e.g. when we are doing large amount of file read and
> page cache is under pressure.  The cached objects quickly got reclaimed
> down to 0 and we are aborting the cache_scan() reclaim.  But counting
> creates a log jam acquiring the sb_lock.

> Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
> Signed-off-by: Mel Gorman <mgorman@...e.de>

Acked-by: Rik van Riel <riel@...hat.com>


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