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vm: document that setting vfs_cache_pressure to 0 isn't a good idea

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Reported-by: Christian Thaeter <ct@pipapo.org>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Jan Kara 2009-09-21 17:01:40 -07:00 committed by Linus Torvalds
parent 5a2ae913f5
commit 55c37a840d
1 changed files with 3 additions and 1 deletions
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Documentation/sysctl/vm.txt
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@ -585,7 +585,9 @@ caching of directory and inode objects.
At the default value of vfs_cache_pressure=100 the kernel will attempt to At the default value of vfs_cache_pressure=100 the kernel will attempt to
reclaim dentries and inodes at a "fair" rate with respect to pagecache and reclaim dentries and inodes at a "fair" rate with respect to pagecache and
swapcache reclaim. Decreasing vfs_cache_pressure causes the kernel to prefer swapcache reclaim. Decreasing vfs_cache_pressure causes the kernel to prefer
to retain dentry and inode caches. Increasing vfs_cache_pressure beyond 100 to retain dentry and inode caches. When vfs_cache_pressure=0, the kernel will
never reclaim dentries and inodes due to memory pressure and this can easily
lead to out-of-memory conditions. Increasing vfs_cache_pressure beyond 100
causes the kernel to prefer to reclaim dentries and inodes. causes the kernel to prefer to reclaim dentries and inodes.
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