The patch titled
vm: document that setting vfs_cache_pressure to 0 isn't a good idea
has been added to the -mm tree. Its filename is
vm-document-that-setting-vfs_cache_pressure-to-0-isnt-a-good-idea.patch
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------------------------------------------------------
Subject: vm: document that setting vfs_cache_pressure to 0 isn't a good idea
From: Jan Kara <jack@xxxxxxx>
Reported-by: Christian Thaeter <ct@xxxxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff -puN Documentation/sysctl/vm.txt~vm-document-that-setting-vfs_cache_pressure-to-0-isnt-a-good-idea Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~vm-document-that-setting-vfs_cache_pressure-to-0-isnt-a-good-idea
+++ a/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.
==============================================================
_
Patches currently in -mm which might be from jack@xxxxxxx are
linux-next.patch
vfs-split-generic_forget_inode-so-that-hugetlbfs-does-not-have-to-copy-it.patch
vm-document-that-setting-vfs_cache_pressure-to-0-isnt-a-good-idea.patch
reiser4-update-names-of-quota-methods.patch
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