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fs: push rcu_barrier() from deactivate_locked_super() to filesystems

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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 <[email protected]>
Cc: Al Viro <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Kirill A. Shutemov 2012-09-26 11:33:07 +10:00 • committed by Al Viro
commit 8c0a853770
47 changed files with 240 additions and 6 deletions
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5
fs/ext2/super.c
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@ -206,6 +206,11 @@ static int init_inodecache(void)
static void destroy_inodecache(void)
{
/*
* Make sure all delayed rcu free inodes are flushed before we
* destroy cache.
*/
rcu_barrier();
kmem_cache_destroy(ext2_inode_cachep);
}