linux-kernel - Re: Patch workqueue: create new slab cache instead of hacking

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Message-ID: <1332345859.5330.8.camel@edumazet-glaptop>
Date:	Wed, 21 Mar 2012 09:04:19 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Christoph Lameter <cl@...ux.com>
Cc:	Tejun Heo <tj@...nel.org>, Lai Jiangshan <laijs@...fujitsu.com>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Patch workqueue: create new slab cache instead of hacking

On Wed, 2012-03-21 at 10:03 -0500, Christoph Lameter wrote:
> On Wed, 21 Mar 2012, Eric Dumazet wrote:
> 
> > Creating a dedicated cache for few objects ? Thats a lot of overhead, at
> > least for SLAB (no merges of caches)
> 
> Its some overhead for SLAB (a lot is what? If you tune down the per cpu
> caches it should be a couple of pages) but its none for SLUB.

SLAB overhead per cache is O(CPUS * nr_node_ids)  (unless alien caches
are disabled)

For few in flight objects, its just better to use standard kmalloc-xxxx
caches.



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