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 Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ 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 -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html