Date: Thu, 7 Apr 2016 19:31:52 -0700 From: Kees Cook <keescook@...omium.org> To: Jesper Dangaard Brouer <brouer@...hat.com> Cc: 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 Thu, Apr 7, 2016 at 2:14 PM, Jesper Dangaard Brouer <brouer@...hat.com> wrote: > > 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). Oh! Yes, you're right. I entirely missed that detail. :) 0-cost randomization! Sounds good to me. :) -Kees > > 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 -- Kees Cook Chrome OS & Brillo Security
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