This is a note to let you know that I've just added the patch titled
vfs: Revert spurious fix to spinning prevention in prune_icache_sb
to the 3.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vfs-revert-spurious-fix-to-spinning-prevention-in-prune_icache_sb.patch
and it can be found in the queue-3.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 5b55d708335a9e3e4f61f2dadf7511502205ccd1 Mon Sep 17 00:00:00 2001
From: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Date: Sat, 13 Apr 2013 16:03:06 -0700
Subject: vfs: Revert spurious fix to spinning prevention in prune_icache_sb
From: Suleiman Souhlal <suleiman@xxxxxxxxxx>
commit 5b55d708335a9e3e4f61f2dadf7511502205ccd1 upstream.
Revert commit 62a3ddef6181 ("vfs: fix spinning prevention in prune_icache_sb").
This commit doesn't look right: since we are looking at the tail of the
list (sb->s_inode_lru.prev) if we want to skip an inode, we should put
it back at the head of the list instead of the tail, otherwise we will
keep spinning on it.
Discovered when investigating why prune_icache_sb came top in perf
reports of a swapping load.
Signed-off-by: Suleiman Souhlal <suleiman@xxxxxxxxxx>
Signed-off-by: Hugh Dickins <hughd@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
fs/inode.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -705,7 +705,7 @@ void prune_icache_sb(struct super_block
* inode to the back of the list so we don't spin on it.
*/
if (!spin_trylock(&inode->i_lock)) {
- list_move_tail(&inode->i_lru, &sb->s_inode_lru);
+ list_move(&inode->i_lru, &sb->s_inode_lru);
continue;
}
Patches currently in stable-queue which might be from suleiman@xxxxxxxxxx are
queue-3.4/vfs-revert-spurious-fix-to-spinning-prevention-in-prune_icache_sb.patch
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