Re: [PATCH 17/17] RCU'd vfsmounts

[Linus Torvalds]

On Thu, Oct 3, 2013 at 10:44 AM, Al Viro <viro@xxxxxxxxxxxxxxxxxx> 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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