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

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Message-ID: <AANLkTimBCrq8cPJrTSKiG_wbd1ppu0twTAMXeezJEZs3@mail.gmail.com>
Date:	Tue, 20 Jul 2010 09:04:46 +0800
From:	shenghui <crosslonelyover@...il.com>
To:	Andreas Gruenbacher <agruen@...e.de>
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

2010/7/20 shenghui <crosslonelyover@...il.com>:
> 2010/7/20 Andreas Gruenbacher <agruen@...e.de>:
>
> Sorry, I haven't found any special attention on
> sysctl_vfs_cache_pressure == 0 case or scale
> nr_to_scan in fs/dcache.c
>
>  900static int shrink_dcache_memory(int nr, gfp_t gfp_mask)
>  901{
>  902        if (nr) {
>  903                if (!(gfp_mask & __GFP_FS))
>  904                        return -1;
>  905                prune_dcache(nr);
>  906        }
>  907        return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
>  908}
>

And for sysctl_vfs_cache_pressure == 0 case, it's
enough to return 0 to indicate no cache entries left.



-- 


Thanks and Best Regards,
shenghui
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