linux-kernel - Re: [PATCH 1/3] IMA: move read/write counters into struct inode

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Date:	Wed, 20 Oct 2010 16:38:45 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Eric Paris <eparis@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	linux-kernel@...r.kernel.org,
	linux-security-module@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, hch@...radead.org, zohar@...ibm.com,
	warthog9@...nel.org, david@...morbit.com, jmorris@...ei.org,
	kyle@...artin.ca, hpa@...or.com, akpm@...ux-foundation.org
Subject: Re: [PATCH 1/3] IMA: move read/write counters into struct inode


* Eric Paris <eparis@...hat.com> wrote:

> Executive summary of the day's work:
> Yesterday morning: 944 bytes per inode in core
> Yesterday night: 24 bytes per inode in core
> Tonight: 4 bytes per inode in core.
> 
> That's a x236 time reduction in memory usage.  No I didn't even start looking at a 
> freezer.  Which could bring that 4 down to 0, but would add a scalability penalty 
> on all inodes when IMA was enabled.

Why not use inode->i_security intelligently? That already exists so that way it's 0 
bytes.

Thanks,

	Ingo
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