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

From: Russ Anderson
Date: Thu Aug 15 2013 - 17:37:41 EST


On Thu, Aug 15, 2013 at 02:06:44PM -0700, Yinghai Lu wrote:
> On Thu, Aug 15, 2013 at 1:43 PM, Andrew Morton
> <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
> > On Wed, 14 Aug 2013 22:46:29 -0700 Yinghai Lu <yinghai@xxxxxxxxxx> 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.

I reserved time tonight on a couple big systems to measure
the performance difference.

Thanks,
--
Russ Anderson, OS RAS/Partitioning Project Lead
SGI - Silicon Graphics Inc rja@xxxxxxx
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