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Message-ID: <CAJcbSZFhsZheqdZ5FD8auhiu8ozCyq-0xY1wjYu3j+Wc2R8nGg@mail.gmail.com>
Date: Wed, 18 May 2016 11:34:58 -0700
From: Thomas Garnier <thgarnie@...gle.com>
To: Christoph Lameter <cl@...ux.com>
Cc: Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>, Andrew Morton <akpm@...ux-foundation.org>,
"Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>, Pranith Kumar <bobby.prani@...il.com>,
David Howells <dhowells@...hat.com>, Tejun Heo <tj@...nel.org>,
Johannes Weiner <hannes@...xchg.org>, David Woodhouse <David.Woodhouse@...el.com>,
Petr Mladek <pmladek@...e.com>, Kees Cook <keescook@...omium.org>, Linux-MM <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>, Greg Thelen <gthelen@...gle.com>,
kernel-hardening@...ts.openwall.com
Subject: Re: [RFC v1 2/2] mm: SLUB Freelist randomization
Yes, I agree that it is not related to the changes.
On Wed, May 18, 2016 at 11:24 AM, Christoph Lameter <cl@...ux.com> wrote:
> 0.On Wed, 18 May 2016, Thomas Garnier wrote:
>
>> slab_test, before:
>> 10000 times kmalloc(8) -> 67 cycles kfree -> 101 cycles
>> 10000 times kmalloc(16) -> 68 cycles kfree -> 109 cycles
>> 10000 times kmalloc(32) -> 76 cycles kfree -> 119 cycles
>> 10000 times kmalloc(64) -> 88 cycles kfree -> 114 cycles
>
>> After:
>> 10000 times kmalloc(8) -> 60 cycles kfree -> 74 cycles
>> 10000 times kmalloc(16) -> 63 cycles kfree -> 78 cycles
>> 10000 times kmalloc(32) -> 72 cycles kfree -> 85 cycles
>> 10000 times kmalloc(64) -> 91 cycles kfree -> 99 cycles
>
> Erm... The fastpath was not touched and the tests primarily exercise the
> fastpath. This is likely some artifact of code placement by the compiler?
>
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