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

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Date:	Fri, 16 Aug 2013 12:15:21 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Russ Anderson <rja@....com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Tejun Heo <tj@...nel.org>, 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 Fri, Aug 16, 2013 at 12:01 PM, Russ Anderson <rja@....com> wrote:
> On Thu, Aug 15, 2013 at 01:43:48PM -0700, Andrew Morton 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.
>
> Here are the timing differences for several machines.
> In each case with the patch less time was spent in __early_pfn_to_nid().
>
>
>                         3.11-rc5        with patch      difference (%)
>                         --------        ----------      --------------
> UV1: 256 nodes  9TB:     411.66          402.47         -9.19 (2.23%)
> UV2: 255 nodes 16TB:    1141.02         1138.12         -2.90 (0.25%)
> UV2:  64 nodes  2TB:     128.15          126.53         -1.62 (1.26%)
> UV2:  32 nodes  2TB:     121.87          121.07         -0.80 (0.66%)
>                         Time in seconds.
>

Thanks.

9T one have more entries in memblock.memory?

Yinghai
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