linux-kernel - Re: [PATCH] kthread: ensure locality of task

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Message-ID: <alpine.DEB.2.10.1401290956060.23856@nuc>
Date:	Wed, 29 Jan 2014 09:57:33 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Nishanth Aravamudan <nacc@...ux.vnet.ibm.com>
cc:	LKML <linux-kernel@...r.kernel.org>,
	Anton Blanchard <anton@...ba.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Jan Kara <jack@...e.cz>, David Rientjes <rientjes@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>,
	linux-mm@...ck.org, Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Ben Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] kthread: ensure locality of task_struct allocations

On Tue, 28 Jan 2014, Nishanth Aravamudan wrote:

> In the presence of memoryless nodes, numa_node_id()/cpu_to_node() will
> return the current CPU's NUMA node, but that may not be where we expect
> to allocate from memory from. Instead, we should use
> numa_mem_id()/cpu_to_mem(). On one ppc64 system with a memoryless Node
> 0, this ends up saving nearly 500M of slab due to less fragmentation.

Reviewed-by: Christoph Lameter <cl@...ux.com>
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