linux-kernel - Re: [PATCH 5/9] Make use of permissions, returned by kobj

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Message-ID: <20080311173646.GA26931@kroah.com>
Date:	Tue, 11 Mar 2008 10:36:46 -0700
From:	Greg KH <greg@...ah.com>
To:	Pavel Emelyanov <xemul@...nvz.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, menage@...gle.com,
	sukadev@...ibm.com, serue@...ibm.com,
	Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH 5/9] Make use of permissions, returned by kobj_lookup

On Tue, Mar 11, 2008 at 12:57:55PM +0300, Pavel Emelyanov wrote:
> 
> Besides, I've measured some things - the lat_syscall test for open from 
> lmbench test suite and the nptl perf test. Here are the results:
> 
>         sec     nosec
> open    3.0980s  3.0709s
> nptl    2.7746s  2.7710s
> 
> So we have 0.88% loss in open and ~0.15% with nptl. I know, this is not that
> much, but it is noticeable. Besides, this is only two tests, digging deeper
> may reveal more.

I think that is in the noise of sampling if you run that test many more
times.

> Let alone the fact that simply turning the CONFIG_SECURITY to 'y' puts +8Kb 
> to the vmlinux...
> 
> I think, I finally agree with you and Al Viro, that the kobj mapper is 
> not the right place to put the filtering, but taking the above numbers 
> into account, can we put the "hooks" into the #else /* CONFIG_SECURITY */
> versions of security_inode_permission/security_file_permission/etc?

Ask the security module interface maintainers about this, not me :)

good luck,

greg k-h
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