linux-kernel - Re: acl_permission_check: disgusting performance

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Message-ID: <BANLkTi=yyoMXNqGtVX9KxHjVaDVGW9uzdA@mail.gmail.com>
Date:	Fri, 13 May 2011 09:16:40 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Serge E. Hallyn" <serge@...lyn.com>
Cc:	"Serge E. Hallyn" <serge.hallyn@...onical.com>,
	"Eric W. Biederman" <ebiederm@...ssion.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 Fri, May 13, 2011 at 6:19 AM, Serge E. Hallyn <serge@...lyn.com> wrote:
>
> Compile-tested with and without CONFIG_USERNS.

Looks ok to me. And generates good code for acl_permission_check
without CONFIG_USER_NS.

I'll see how much that function drops on the kernel profiles..

                       Linus
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