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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/sysv
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/sysv')
-rw-r--r--fs/sysv/inode.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/sysv/inode.c b/fs/sysv/inode.c
index 80e1e2b18df1..0d0c50bd3321 100644
--- a/fs/sysv/inode.c
+++ b/fs/sysv/inode.c
@@ -360,5 +360,10 @@ int __init sysv_init_icache(void)
360 360
361void sysv_destroy_icache(void) 361void sysv_destroy_icache(void)
362{ 362{
363 /*
364 * Make sure all delayed rcu free inodes are flushed before we
365 * destroy cache.
366 */
367 rcu_barrier();
363 kmem_cache_destroy(sysv_inode_cachep); 368 kmem_cache_destroy(sysv_inode_cachep);
364} 369}