Commit 24c32d73 authored May 08, 2007 by Andrew Morton Committed by Linus Torvalds May 08, 2007

mm: shrink parent dentries when shrinking slab



Teach the dentry slab shrinker to aggressively shrink parent dentries when
shrinking the dentry cache.

This is done to attempt to improve the situation where the dentry slab cache
gets a lot of internal fragmentation due to pages containing directory
dentries.  It is expected that this change will cause some of those dentries
to be reaped earlier, and with less scanning.

Needs careful testing.

Cc: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent d52b9086

fs/dcache.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -879,7 +879,7 @@ static int shrink_dcache_memory(int nr, gfp_t gfp_mask)
		if (nr) {
		if (!(gfp_mask & __GFP_FS))
		return -1;
		prune_dcache(nr, NULL, 0);
		prune_dcache(nr, NULL, 1);
		}
		return (dentry_stat.nr_unused / 100) * sysctl_vfs_cache_pressure;
		}

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