From: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Date: Wed, 26 Sep 2012 01:33:07 +0000 (+1000)
Subject: fs: push rcu_barrier() from deactivate_locked_super() to filesystems
X-Git-Tag: omap-for-v3.7-rc1/fixes-cpufreq-signed~36^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8c0a85377048b64c880e76ec7368904fe46d0b94;p=pandora-kernel.git

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>
---

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