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Re: [RFC v1 2/2] mm: SLUB Freelist randomization

From Christoph Lameter <cl@linux.com>
Newsgroups linux.kernel
Subject Re: [RFC v1 2/2] mm: SLUB Freelist randomization
Date 2016-05-18 20:30 +0200
Message-ID <rAeoi-5Fp-9@gated-at.bofh.it> (permalink)
References <rAdVf-5eB-7@gated-at.bofh.it> <rAdVf-5eB-5@gated-at.bofh.it>
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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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Thread

[RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier <thgarnie@google.com> - 2016-05-18 20:00 +0200
  Re: [RFC v1 2/2] mm: SLUB Freelist randomization Christoph Lameter <cl@linux.com> - 2016-05-18 20:30 +0200
    Re: [RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier <thgarnie@google.com> - 2016-05-18 20:40 +0200
      Re: [RFC v1 2/2] mm: SLUB Freelist randomization Christoph Lameter <cl@linux.com> - 2016-05-18 21:10 +0200
        Re: [RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier <thgarnie@google.com> - 2016-05-18 21:20 +0200
          Re: [RFC v1 2/2] mm: SLUB Freelist randomization Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-05-19 04:10 +0200
            Re: [RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier <thgarnie@google.com> - 2016-05-19 22:30 +0200
              Re: [RFC v1 2/2] mm: SLUB Freelist randomization Joonsoo Kim <js1304@gmail.com> - 2016-05-20 04:20 +0200
                Re: [RFC v1 2/2] mm: SLUB Freelist randomization Thomas Garnier <thgarnie@google.com> - 2016-05-20 18:30 +0200
                Re: [RFC v1 2/2] mm: SLUB Freelist randomization Joonsoo Kim <iamjoonsoo.kim@lge.com> - 2016-05-24 07:20 +0200

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