linux-kernel - Re: [PATCH 17/17] RCU'd vfsmounts

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Message-ID: <CA+55aFy5kA7ubyetouWsB0OnB5mMRAoyQ-4kbQsCVWARFaf9MA@mail.gmail.com>
Date:	Thu, 3 Oct 2013 12:06:04 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 17/17] RCU'd vfsmounts

On Thu, Oct 3, 2013 at 10:44 AM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Anyway, I've done nicer variants of that protection for everything except
> fuse (hadn't gotten around to it yet); see vfs.git#experimental now:

Ok, I did a quick test, and it looks ok here, so looking good for 3.13.

However, the new smp_mb() in mntput_no_expire() is quite noticeable in
the path lookup stress-test profiles. And I'm not seeing what that
allegedly protects against, especially if mnt_ns is NULL (ie all the
common important cases).

            Linus
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