Re: [PATCH 26/31] sched: numa: Make mempolicy home-node aware

[Mel Gorman]

On Wed, Nov 14, 2012 at 01:22:33PM -0500, Rik van Riel wrote:
> On 11/13/2012 06:12 AM, Mel Gorman wrote:
> >From: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
> >
> >Add another layer of fallback policy to make the home node concept
> >useful from a memory allocation PoV.
> >
> >This changes the mpol order to:
> >
> >  - vma->vm_ops->get_policy	[if applicable]
> >  - vma->vm_policy		[if applicable]
> >  - task->mempolicy
> >  - tsk_home_node() preferred	[NEW]
> >  - default_policy
> 
> Why is the home node policy not the default policy?
> 

hmm, it effectively is if there is no other policy set. The changelog is
a bit misleading. In V3, this will be dropped entirely. It was not clear
that doing a remote alloc for home nodes was a good idea. Instead memory
is always allocated locally to the faulting process as normal and
migrated later if necessary.

-- 
Mel Gorman
SUSE Labs
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