linux-ext4 - Re: [PATCH] fix return value for mb_cache_shrink_fn when nr_to

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Date:	Mon, 19 Jul 2010 20:39:06 +0200
From:	Andreas Gruenbacher <agruen@...e.de>
To:	"Wang Sheng-Hui" <crosslonelyover@...il.com>
Cc:	Christoph Hellwig <hch@...radead.org>,
	Eric Sandeen <sandeen@...hat.com>,
	linux-fsdevel@...r.kernel.org, viro@...iv.linux.org.uk,
	linux-mm@...ck.org, "linux-ext4" <linux-ext4@...r.kernel.org>,
	"kernel-janitors" <kernel-janitors@...r.kernel.org>
Subject: Re: [PATCH] fix return value for mb_cache_shrink_fn when nr_to_scan > 0

On Sunday 18 July 2010 08:36:59 Wang Sheng-Hui wrote:
> I regenerated the patch. Please check it.

The logic for calculating how many objects to free is still wrong: 
mb_cache_shrink_fn returns the number of entries scaled by 
sysctl_vfs_cache_pressure / 100.  It should also scale nr_to_scan by the 
inverse of that.  The sysctl_vfs_cache_pressure == 0 case (never scale) may 
require special attention.

See dcache_shrinker() in fs/dcache.c.

Thanks,
Andreas
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