linux-kernel - Re: [RFC 0/3] Slab allocator array operations

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Message-ID: <20150204001922.5650ca4b@redhat.com>
Date:	Wed, 4 Feb 2015 00:19:22 +0100
From:	Jesper Dangaard Brouer <brouer@...hat.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	penberg@...nel.org, brouer@...hat.com,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>
Subject: Re: [RFC 0/3] Slab allocator array operations

On Fri, 23 Jan 2015 18:28:00 -0600 (CST)
Christoph Lameter <cl@...ux.com> wrote:

> On Fri, 23 Jan 2015, Andrew Morton wrote:
> 
> > On Fri, 23 Jan 2015 15:37:27 -0600 Christoph Lameter <cl@...ux.com> wrote:
> >
> > > Attached a series of 3 patches to implement functionality to allocate
> > > arrays of pointers to slab objects. This can be used by the slab
> > > allocators to offer more optimized allocation and free paths.
> >
> > What's the driver for this?  The networking people, I think?  If so,
> > some discussion about that would be useful: who is involved, why they
> > have this need, who are the people we need to bug to get it tested,
> > whether this implementation is found adequate, etc.

Yes, networking people like me ;-)

I promised Christoph that I will performance benchmark this. I'll start
by writing/performing some micro benchmarks, but it first starts to get
really interesting once we plug it into e.g. the networking stack, as
effects as instruction-cache misses due to code size starts to play a
role.

> 
> Jesper and I gave a talk at LCA about this. LWN has an article on it.

LWN: Improving Linux networking performance
 - http://lwn.net/Articles/629155/
 - YouTube: https://www.youtube.com/watch?v=3XG9-X777Jo

LWN: Toward a more efficient slab allocator
 - http://lwn.net/Articles/629152/
 - YouTube: https://www.youtube.com/watch?v=s0lZzP1jOzI

-- 
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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