From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>,
Andrew Morton <akpm@linux-foundation.org>,
Oleg Nesterov <oleg@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Pavel Emelyanov <xemul@parallels.com>,
Cyrill Gorcunov <gorcunov@openvz.org>,
Louis Rilling <louis.rilling@kerlabs.com>,
Mike Galbraith <efault@gmx.de>,
Christoph Hellwig <hch@infradead.org>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH] vfs: Speed up deactivate_super for non-modular filesystems
Date: Mon, 7 May 2012 16:56:47 -0700 [thread overview]
Message-ID: <20120507235647.GH21152@linux.vnet.ibm.com> (raw)
In-Reply-To: <20120507221706.GI22082@ZenIV.linux.org.uk>
On Mon, May 07, 2012 at 11:17:06PM +0100, Al Viro wrote:
> On Mon, May 07, 2012 at 02:51:08PM -0700, Eric W. Biederman wrote:
>
> > /proc and similar non-modular filesystems do not need a rcu_barrier
> > in deactivate_locked_super. Being non-modular there is no danger
> > of the rcu callback running after the module is unloaded.
>
> There's more than just a module unload there, though - actual freeing
> struct super_block also happens past that rcu_barrier()...
Is there anything in there for which synchronous operation is required?
If not, one approach would be to drop the rcu_barrier() calls to a
workqueue or something similar.
Thanx, Paul
next prev parent reply other threads:[~2012-05-07 23:57 UTC|newest]
Thread overview: 71+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-28 9:19 [RFC PATCH] namespaces: fix leak on fork() failure Mike Galbraith
2012-04-28 14:26 ` Oleg Nesterov
2012-04-29 4:13 ` Mike Galbraith
2012-04-29 7:57 ` Eric W. Biederman
2012-04-29 9:49 ` Mike Galbraith
2012-04-29 16:58 ` Oleg Nesterov
2012-04-30 2:59 ` Eric W. Biederman
2012-04-30 3:25 ` Mike Galbraith
2012-05-02 12:40 ` Oleg Nesterov
2012-05-02 17:37 ` Eric W. Biederman
2012-04-30 3:01 ` [PATCH] " Mike Galbraith
[not found] ` <m1zk9rmyh4.fsf@fess.ebiederm.org>
2012-05-01 20:42 ` Andrew Morton
2012-05-03 3:12 ` Mike Galbraith
2012-05-03 14:56 ` Mike Galbraith
2012-05-04 4:27 ` Mike Galbraith
2012-05-04 7:55 ` Eric W. Biederman
2012-05-04 8:34 ` Mike Galbraith
2012-05-04 9:45 ` Mike Galbraith
2012-05-04 14:13 ` Eric W. Biederman
2012-05-04 14:49 ` Mike Galbraith
2012-05-04 15:36 ` Eric W. Biederman
2012-05-04 16:57 ` Mike Galbraith
2012-05-04 20:29 ` Eric W. Biederman
2012-05-05 5:56 ` Mike Galbraith
2012-05-05 6:08 ` Mike Galbraith
2012-05-05 7:12 ` Mike Galbraith
2012-05-05 11:37 ` Eric W. Biederman
2012-05-07 21:51 ` [PATCH] vfs: Speed up deactivate_super for non-modular filesystems Eric W. Biederman
2012-05-07 22:17 ` Al Viro
2012-05-07 23:56 ` Paul E. McKenney [this message]
2012-05-08 1:07 ` Eric W. Biederman
2012-05-08 4:53 ` Mike Galbraith
2012-05-09 7:55 ` Nick Piggin
2012-05-09 11:02 ` Eric W. Biederman
2012-05-09 11:02 ` Eric W. Biederman
2012-05-15 8:40 ` Nick Piggin
2012-05-16 0:34 ` Eric W. Biederman
2012-05-16 0:34 ` Eric W. Biederman
2012-05-09 13:59 ` Paul E. McKenney
2012-05-04 8:03 ` [PATCH] Re: [RFC PATCH] namespaces: fix leak on fork() failure Eric W. Biederman
2012-05-04 8:19 ` Mike Galbraith
2012-05-04 8:54 ` Mike Galbraith
2012-05-07 0:32 ` [PATCH 0/3] pidns: Closing the pid namespace exit race Eric W. Biederman
2012-05-07 0:33 ` [PATCH 1/3] pidns: Use task_active_pid_ns in do_notify_parent Eric W. Biederman
2012-05-07 0:35 ` [PATCH 2/3] pidns: Guarantee that the pidns init will be the last pidns process reaped Eric W. Biederman
2012-05-08 22:50 ` Andrew Morton
2012-05-16 18:39 ` Oleg Nesterov
2012-05-16 19:34 ` Oleg Nesterov
2012-05-16 20:54 ` Eric W. Biederman
2012-05-17 17:00 ` Oleg Nesterov
2012-05-17 21:46 ` Eric W. Biederman
2012-05-18 12:39 ` Oleg Nesterov
2012-05-19 0:03 ` Eric W. Biederman
2012-05-21 12:44 ` Oleg Nesterov
2012-05-22 0:16 ` Eric W. Biederman
2012-05-22 0:20 ` [PATCH] pidns: Guarantee that the pidns init will be the last pidns process reaped. v2 Eric W. Biederman
2012-05-22 16:54 ` Oleg Nesterov
2012-05-22 19:23 ` Andrew Morton
2012-05-23 14:52 ` Oleg Nesterov
2012-05-25 15:15 ` [PATCH -mm] pidns-guarantee-that-the-pidns-init-will-be-the-last-pidns-process-r eaped-v2-fix-fix Oleg Nesterov
2012-05-25 15:59 ` [PATCH -mm 0/1] pidns: find_new_reaper() can no longer switch to init_pid_ns.child_reaper Oleg Nesterov
2012-05-25 16:00 ` [PATCH -mm 1/1] " Oleg Nesterov
2012-05-25 21:43 ` Eric W. Biederman
2012-05-27 19:10 ` [PATCH v2 -mm 0/1] " Oleg Nesterov
2012-05-27 19:11 ` [PATCH v2 -mm 1/1] " Oleg Nesterov
2012-05-29 6:34 ` Eric W. Biederman
2012-05-25 21:25 ` [PATCH -mm] pidns-guarantee-that-the-pidns-init-will-be-the-last-pidns-process-r eaped-v2-fix-fix Eric W. Biederman
2012-05-27 18:41 ` [PATCH -mm v2] " Oleg Nesterov
2012-05-07 0:35 ` [PATCH 3/3] pidns: Make killed children autoreap Eric W. Biederman
2012-05-08 22:51 ` Andrew Morton
2012-04-30 13:57 ` [RFC PATCH] namespaces: fix leak on fork() failure Mike Galbraith
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