Messages in this thread | | | Date | Wed, 7 Nov 2012 10:49:40 +0000 | From | Mel Gorman <> | Subject | Re: [PATCH 15/19] mm: numa: Add fault driven placement and migration |
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On Tue, Nov 06, 2012 at 02:41:13PM -0500, Rik van Riel wrote: > On 11/06/2012 04:14 AM, Mel Gorman wrote: > >From: Peter Zijlstra <a.p.zijlstra@chello.nl> > > > >NOTE: This patch is based on "sched, numa, mm: Add fault driven > > placement and migration policy" but as it throws away all the policy > > to just leave a basic foundation I had to drop the signed-offs-by. > > > >This patch creates a bare-bones method for setting PTEs pte_numa in the > >context of the scheduler that when faulted later will be faulted onto the > >node the CPU is running on. In itself this does nothing useful but any > >placement policy will fundamentally depend on receiving hints on placement > >from fault context and doing something intelligent about it. > > > >Signed-off-by: Mel Gorman <mgorman@suse.de> > > Excellent basis for implementing a smarter NUMA > policy. > > Not sure if such a policy should be implemented > as a replacement for this patch, or on top of it... >
I'm expecting on top of it. As a POC, I'm looking at implementing the CPU Follows Memory algorithm (mostly from autonuma) on top of this but using the home-node logic from schednuma to handle how processes get scheduled. MORON will need to relax to take the home node into account to avoid fighting the home-node decisions. task_numa_fault() determines if the home node needs to change based on statistics it gathers from faults. So far I am keeping within the framework but it is still a WIP.
> Either way, thank you for cleaning up all of the > NUMA base code, while I was away at conferences > and stuck in airports :) >
My pleasure. Thanks a lot for reviewing this!
-- Mel Gorman SUSE Labs
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