linux-kernel - Re: [RT LATENCY] 249 microsecond latency caused by slub's unfreeze

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Date:	Wed, 5 Jun 2013 14:09:21 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	JoonSoo Kim <js1304@...il.com>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	RT <linux-rt-users@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Clark Williams <clark@...hat.com>,
	Pekka Enberg <penberg@...nel.org>
Subject: Re: [RT LATENCY] 249 microsecond latency caused by slub's
 unfreeze_partials() code.

On Wed, 5 Jun 2013, JoonSoo Kim wrote:

> @@ -2495,7 +2495,8 @@ static void __slab_free(struct kmem_cache *s,
> struct page *page,
>                 new.inuse--;
>                 if ((!new.inuse || !prior) && !was_frozen) {
>
> -                       if (!kmem_cache_debug(s) && !prior)
> +                       if (!kmem_cache_debug(s) && !prior &&
> +                               node_match(page,
> cpu_to_node(smp_processor_id())))
>

Would increase the overhead of the free path. cpu_to_node? Use
numa_node_id().
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