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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2012-09-25 21:33:07 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2012-10-02 21:35:55 -0400
commit8c0a85377048b64c880e76ec7368904fe46d0b94 (patch)
tree12e075f4159e88b09a89e35866017f82f80bcc7d /fs/nilfs2
parent99621b44aa194eab594e1f17217231c02b519211 (diff)
fs: push rcu_barrier() from deactivate_locked_super() to filesystems
There's no reason to call rcu_barrier() on every deactivate_locked_super(). We only need to make sure that all delayed rcu free inodes are flushed before we destroy related cache. Removing rcu_barrier() from deactivate_locked_super() affects some fast paths. E.g. on my machine exit_group() of a last process in IPC namespace takes 0.07538s. rcu_barrier() takes 0.05188s of that time. Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/nilfs2')
-rw-r--r--fs/nilfs2/super.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index 6a10812711c1..3c991dc84f2f 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -1382,6 +1382,12 @@ static void nilfs_segbuf_init_once(void *obj)
1382 1382
1383static void nilfs_destroy_cachep(void) 1383static void nilfs_destroy_cachep(void)
1384{ 1384{
1385 /*
1386 * Make sure all delayed rcu free inodes are flushed before we
1387 * destroy cache.
1388 */
1389 rcu_barrier();
1390
1385 if (nilfs_inode_cachep) 1391 if (nilfs_inode_cachep)
1386 kmem_cache_destroy(nilfs_inode_cachep); 1392 kmem_cache_destroy(nilfs_inode_cachep);
1387 if (nilfs_transaction_cachep) 1393 if (nilfs_transaction_cachep)