linux-kernel - Re: ima: use of radix tree cache indexing == massive waste of memory?

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Date:	Mon, 18 Oct 2010 13:57:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Eric Paris <eparis@...hat.com>
Cc:	Eric Paris <eparis@...isplace.org>,
	Mimi Zohar <zohar@...ux.vnet.ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Dave Chinner <david@...morbit.com>,
	linux-kernel@...r.kernel.org, Mimi Zohar <zohar@...ibm.com>,
	warthog9@...nel.org, hpa@...or.com, devel@...ts.fedoraprojet.org
Subject: Re: ima: use of radix tree cache indexing == massive waste of
 memory?

On Sun, 2010-10-17 at 10:16 -0400, Eric Paris wrote:
> If instead you attack the problem from the other side and start with all
> of the files we'd need some kind of freezer to so we could get the
> atomicity required.  We'd have to review every single file on the system
> before we could be certain that the inode was correct.  Maybe I'm wrong
> and someone else can help me see how to solve it this way.... 

Well, you could use the actual freezer to freeze luserspace and then
simply iterate all open files, I mean, those few sods who actually want
this enabled can either pass a boot option to enable from boot or suffer
the overhead on enable, right?


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