From: Thomas Garnier <thgarnie@google.com>
To: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
"Paul E . McKenney" <paulmck@linux.vnet.ibm.com>,
Pranith Kumar <bobby.prani@gmail.com>,
David Howells <dhowells@redhat.com>, Tejun Heo <tj@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
David Woodhouse <David.Woodhouse@intel.com>,
Petr Mladek <pmladek@suse.com>, Kees Cook <keescook@chromium.org>,
Linux-MM <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Greg Thelen <gthelen@google.com>,
kernel-hardening@lists.openwall.com
Subject: Re: [RFC v1 2/2] mm: SLUB Freelist randomization
Date: Wed, 18 May 2016 11:34:58 -0700 [thread overview]
Message-ID: <CAJcbSZFhsZheqdZ5FD8auhiu8ozCyq-0xY1wjYu3j+Wc2R8nGg@mail.gmail.com> (raw)
In-Reply-To: <alpine.DEB.2.20.1605181323260.14349@east.gentwo.org>
Yes, I agree that it is not related to the changes.
On Wed, May 18, 2016 at 11:24 AM, Christoph Lameter <cl@linux.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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next prev parent reply other threads:[~2016-05-18 18:35 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-18 17:56 [RFC v1 0/2] " Thomas Garnier
2016-05-18 17:56 ` [RFC v1 1/2] mm: Reorganize SLAB freelist randomization Thomas Garnier
2016-05-18 17:56 ` [RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier
2016-05-18 18:24 ` Christoph Lameter
2016-05-18 18:34 ` Thomas Garnier [this message]
2016-05-18 19:02 ` Christoph Lameter
2016-05-18 19:12 ` Thomas Garnier
2016-05-19 2:07 ` Joonsoo Kim
2016-05-19 20:20 ` Thomas Garnier
2016-05-20 2:15 ` Joonsoo Kim
2016-05-20 16:24 ` Thomas Garnier
2016-05-24 5:17 ` Joonsoo Kim
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