linux-kernel - Re: Credentials test patch

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Message-ID: <a36005b50709150851s52d04554t62d53dab3f47eaf8@mail.gmail.com>
Date:	Sat, 15 Sep 2007 08:51:39 -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

In sys_faccessat you temporarily allocate a cred object which is
discarded in the end.  With a few more macro definitions you could
create a dup_cred variant which initialized an automatic variable of
type struct cred.  This way the kmalloc/kfree pair would fall away.

access is actually used frequently.  For instance, ld.so uses it on
every startup as a quicker possibility to check for a file which
usually doesn't exist.  So, speeding up access has some small effect
on performance.  The resulting code might actually reduce the kernel
size a bit due to all the checks and calls which go away.
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