linux-kernel - Re: [PATCH] memblock, numa: Binary search node id

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Message-ID: <CAE9FiQUyGpmMP0VPE5ZrvDMLB-sdb0DzajGvB_KDt-ZnoJZhPg@mail.gmail.com>
Date:	Thu, 15 Aug 2013 14:06:44 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>, Russ Anderson <rja@....com>,
	Linux MM <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] memblock, numa: Binary search node id

On Thu, Aug 15, 2013 at 1:43 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Wed, 14 Aug 2013 22:46:29 -0700 Yinghai Lu <yinghai@...nel.org> wrote:
>
>> Current early_pfn_to_nid() on arch that support memblock go
>> over memblock.memory one by one, so will take too many try
>> near the end.
>>
>> We can use existing memblock_search to find the node id for
>> given pfn, that could save some time on bigger system that
>> have many entries memblock.memory array.
>
> Looks nice.  I wonder how much difference it makes.

Russ said he would test on his 256 nodes system, but looks he never
got chance.

Thanks

Yinghai
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