From: Al Viro <viro@ZenIV.linux.org.uk>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: 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>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.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 23:17:06 +0100 [thread overview]
Message-ID: <20120507221706.GI22082@ZenIV.linux.org.uk> (raw)
In-Reply-To: <87r4uv64oj.fsf_-_@xmission.com>
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()...
next prev parent reply other threads:[~2012-05-07 22:17 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1335604790.5995.22.camel@marge.simpson.net>
[not found] ` <20120428142605.GA20248@redhat.com>
[not found] ` <m14ns355ru.fsf@fess.ebiederm.org>
[not found] ` <20120429165846.GA19054@redhat.com>
[not found] ` <1335754867.17899.4.camel@marge.simpson.net>
[not found] ` <m1zk9rmyh4.fsf@fess.ebiederm.org>
[not found] ` <20120501134214.f6b44f4a.akpm@linux-foundation.org>
[not found] ` <1336014721.7370.32.camel@marge.simpson.net>
[not found] ` <1336057018.8119.46.camel@marge.simpson.net>
[not found] ` <1336105676.7356.42.camel@marge.simpson.net>
[not found] ` <m1aa1oidmn.fsf@fess.ebiederm.org>
[not found] ` <1336124716.25479.36.camel@marge.simpson.net>
[not found] ` <m1vckcdoey.fsf@fess.ebiederm.org>
[not found] ` <1336142995.25479.49.camel@marge.simpson.net>
[not found] ` <m1zk9oc61j.fsf@fess.ebiederm.org>
[not found] ` <1336150643.7502.4.camel@marge.simpson.net>
[not found] ` <m1fwbfd71h.fsf@fess.ebiederm.org>
[not found] ` <1336197362.7346.9.camel@marge.simpson.net>
[not found] ` <1336198093.7346.11.camel@marge.simpson.net>
[not found] ` <1336201977.7346.22.camel@marge.simpson.net>
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 [this message]
2012-05-07 23:56 ` Paul E. McKenney
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
2012-05-15 8:40 ` Nick Piggin
2012-05-16 0:34 ` Eric W. Biederman
2012-05-09 13:59 ` Paul E. McKenney
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20120507221706.GI22082@ZenIV.linux.org.uk \
--to=viro@zeniv.linux.org.uk \
--cc=akpm@linux-foundation.org \
--cc=ebiederm@xmission.com \
--cc=efault@gmx.de \
--cc=gorcunov@openvz.org \
--cc=hch@infradead.org \
--cc=linux-fsdevel@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=louis.rilling@kerlabs.com \
--cc=oleg@redhat.com \
--cc=paulmck@linux.vnet.ibm.com \
--cc=xemul@parallels.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).