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authorJan Kara <jack@suse.cz>2009-09-21 17:01:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-22 07:17:30 -0700
commit55c37a840d9ec0ebed5c944355156d490b1ad5d1 (patch)
tree5544b93b41133b85f7f825e61fe3583fb39ff211 /Documentation/sysctl
parent5a2ae913f5229d6e1d4a666f0477350789d5128e (diff)
downloadlinaro-lsk-55c37a840d9ec0ebed5c944355156d490b1ad5d1.tar.gz
vm: document that setting vfs_cache_pressure to 0 isn't a good idea
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>
Diffstat (limited to 'Documentation/sysctl')
-rw-r--r--Documentation/sysctl/vm.txt4
1 files changed, 3 insertions, 1 deletions
diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index c4de6359d44..e6fb1ec2744 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt
@@ -585,7 +585,9 @@ caching of directory and inode objects.
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
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.
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