linux-kernel - Re: [PATCH 2/3] x86: add numa_move_cpus_to

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Message-ID: <4A09AEFB.4070808@kernel.org>
Date:	Tue, 12 May 2009 10:16:43 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Christoph Lameter <cl@...ux-foundation.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Pekka Enberg <penberg@...helsinki.fi>
Subject: Re: [PATCH 2/3] x86: add numa_move_cpus_to_node

Christoph Lameter wrote:
> On Mon, 11 May 2009, Yinghai Lu wrote:
> 
>>> This going to be fun for the allocators that have put their queues on the
>>> respective nodes. How are the various OS structures that were allocated on
>>> the node that is downed / upped relocated?
>> NODE_DATA is new allocated on that node is backed on line for the first time.
>>
>> per_cpu will still stay with old near node. because per_cpu is somehow preallocated for all possible cpu.
> 
> Slab allocators and page allocator use neither NODE_DATA nor percpu
> 
> It may be best to bring the processors down and up again if the node
> assignment changes. That will cause the allocators to reallocate the per
> cpu resources on the right node.

or let user util do that? aka before hotadd mem to that node, use /sys to bring
the cpu offine and put the cpus online after mem is added ?

YH
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