linux-kernel - Re: acl_permission_check: disgusting performance

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Message-ID: <BANLkTin-7HXdbDXaCBmJAncpOauowAB6Bg@mail.gmail.com>
Date:	Thu, 12 May 2011 21:16:58 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	"Serge E. Hallyn" <serge@...lyn.com>,
	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	Daniel Lezcano <daniel.lezcano@...e.fr>,
	David Howells <dhowells@...hat.com>,
	James Morris <jmorris@...ei.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	containers@...ts.linux-foundation.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: acl_permission_check: disgusting performance

On Thu, May 12, 2011 at 8:52 PM, Eric W. Biederman
<ebiederm@...ssion.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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