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From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Thu, 12 May 2011 21:16:58 -0700
Message-ID: <BANLkTin-7HXdbDXaCBmJAncpOauowAB6Bg@mail.gmail.com>
Subject: Re: acl_permission_check: disgusting performance
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Serge E. Hallyn" <serge@hallyn.com>,
        "Serge E. Hallyn" <serge.hallyn@canonical.com>,
        Daniel Lezcano <daniel.lezcano@free.fr>,
        David Howells <dhowells@redhat.com>, James Morris <jmorris@namei.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        containers@lists.linux-foundation.org,
        Al Viro <viro@zeniv.linux.org.uk>
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On Thu, May 12, 2011 at 8:52 PM, Eric W. Biederman
<ebiederm@xmission.com> wrote:
>
> In any event an inline version of current_user_ns that returns
> init_user_ns in the case where user namespaces aren't compiled in should
> fix the immediate performance problems by allowing the compiler to
> optimize them out.

Yes. However, then Serge's patch in the next email immediately breaks
that optimization ;^(

                            Linus
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