lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

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

Browse Source 
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>
This commit is contained in:
Kirill A. Shutemov
2012-09-26 11:33:07 +10:00
committed by Al Viro
parent 99621b44aa
commit 8c0a853770
47 changed files with 240 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
fs/btrfs/extent_io.c
View File

@@ -107,6 +107,12 @@ void extent_io_exit(void)
list_del(&eb->leak_list);
kmem_cache_free(extent_buffer_cache, eb);
}
/*
* Make sure all delayed rcu free are flushed before we
* destroy caches.
*/
rcu_barrier();
if (extent_state_cache)
kmem_cache_destroy(extent_state_cache);
if (extent_buffer_cache)