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Date: Thu, 30 Apr 2015 21:20:45 +0200
From: Jesper Dangaard Brouer <brouer@redhat.com>
Subject: Re: slub: bulk allocation from per cpu partial pages
Message-ID: <20150430212045.1a8439d3@redhat.com>
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To: Christoph Lameter <cl@linux.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Pekka Enberg <penberg@kernel.org>, David Rientjes <rientjes@google.com>, linux-mm@kvack.org, brouer@redhat.com

On Thu, 30 Apr 2015 13:40:58 -0500 (CDT)
Christoph Lameter <cl@linux.com> wrote:

> On Fri, 17 Apr 2015, Jesper Dangaard Brouer wrote:
> 
> > > Ups, I can see that this kernel don't have CONFIG_SLUB_CPU_PARTIAL,
> > > I'll re-run tests with this enabled.
> >
> > Results with CONFIG_SLUB_CPU_PARTIAL.
> >
> >  size    --  optimized -- fallback
> >  bulk  8 --  16ns      -- 22ns
> >  bulk 16 --  16ns      -- 22ns
> >  bulk 30 --  16ns      -- 22ns
> >  bulk 32 --  16ns      -- 22ns
> >  bulk 64 --  30ns      -- 38ns
> 
> That looks better. Can I get the code for testing? Then I can vary the
> approach a bit before posting patches? I still want to add a fast path for
> allocation from the per node partial list.

Sure you can get the code.  For now the test is fairly simple, will
expand later. I have made a branch "mm_bulk_api" to avoid
people using my repo getting compile errors (due to API not merged).

Git repo[1] branch "mm_bulk_api":
 [1] https://github.com/netoptimizer/prototype-kernel/

The test kernel module is called "slab_bulk_test01", located under
kernel/mm/slab_bulk_test01.c [2].


[2] https://github.com/netoptimizer/prototype-kernel/blob/mm_bulk_api/kernel/mm/slab_bulk_test01.c
Howto use repo [3]:
[3] http://netoptimizer.blogspot.dk/2014/11/announce-github-repo-prototype-kernel.html

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

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