linux-kernel - Re: [RFC v1] mm: SLAB freelist randomization

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Date:	Thu, 7 Apr 2016 23:14:13 +0200
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Kees Cook <keescook@...omium.org>
Cc:	brouer@...hat.com, Thomas Garnier <thgarnie@...gle.com>,
	Christoph Lameter <cl@...ux.com>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>,
	"kernel-hardening@...ts.openwall.com" 
	<kernel-hardening@...ts.openwall.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux-MM <linux-mm@...ck.org>,
	Laura Abbott <labbott@...oraproject.org>
Subject: Re: [RFC v1] mm: SLAB freelist randomization


On Wed, 6 Apr 2016 14:45:30 -0700 Kees Cook <keescook@...omium.org> wrote:

> On Wed, Apr 6, 2016 at 12:35 PM, Thomas Garnier <thgarnie@...gle.com> wrote:
[...]
> > re-used on slab creation for performance.  
> 
> I'd like to see some benchmark results for this so the Kconfig can
> include the performance characteristics. I recommend using hackbench
> and kernel build times with a before/after comparison.
> 

It looks like it only happens on init, right? (Thus must bench tools
might not be the right choice).

My slab tools for benchmarking the fastpath is here:
 https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/mm/slab_bulk_test01.c

And I also carry a version of Christoph's slab bench tool:
 https://github.com/netoptimizer/prototype-kernel/blob/master/kernel/mm/slab_test.c

-- 
Best regards,
  Jesper Dangaard Brouer
  MSc.CS, Principal Kernel Engineer at Red Hat
  Author of http://www.iptv-analyzer.org
  LinkedIn: http://www.linkedin.com/in/brouer