linux-kernel - Re: Credentials test patch

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Message-ID: <a36005b50709170728y58aae6a4n2a570dddc2bc7720@mail.gmail.com>
Date:	Mon, 17 Sep 2007 07:28:30 -0700
From:	"Ulrich Drepper" <drepper@...il.com>
To:	"David Howells" <dhowells@...hat.com>
Cc:	viro@....linux.org.uk, hch@...radead.org, torvalds@...l.org,
	linux-kernel@...r.kernel.org
Subject: Re: Credentials test patch

On 9/17/07, David Howells <dhowells@...hat.com> wrote:
> A better way would be to compare fsuid/fsgid to uid/gid and to just take an
> extra ref on the incumbent cred object if they're the same, rather than always
> allocating a new one.  That, I suspect, would speed up 99.99% of the cases.

Indeed.  It's probably rare to have different values and for the case
I mentioned even more so since it happens before the first user code
gets executed.
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