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

[Rik van Riel]

On 05/22/2014 05:09 AM, Mel Gorman wrote:
> From: Tim Chen <tim.c.chen@xxxxxxxxxxxxxxx>
> 
> 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@xxxxxxxxxxxxxxx>
> Signed-off-by: Mel Gorman <mgorman@xxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>


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