linux-kernel - Re: Comparison between three trees (was: Latest numa/core release, v17)

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Date:	Sun, 25 Nov 2012 16:47:15 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Paul Turner <pjt@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Comparison between three trees (was: Latest numa/core release, v17)

On 11/24/12, Mel Gorman <mgorman@...e.de> wrote:
> Warning: This is an insanely long mail and there a lot of data here. Get
> 	coffee or something.
>
> This is another round of comparisons between the latest released versions
> of each of three automatic numa balancing trees that are out there.
>
> From the series "Automatic NUMA Balancing V5", the kernels tested were
>
> stats-v5r1	Patches 1-10. TLB optimisations, migration stats
> thpmigrate-v5r1	Patches 1-37. Basic placement policy, PMD handling, THP
> migration etc.
> adaptscan-v5r1	Patches 1-38. Heavy handed PTE scan reduction
> delaystart-v5r1 Patches 1-40. Delay the PTE scan until running on a new
> node
>
> If I just say balancenuma, I mean the "delaystart-v5r1" kernel. The other
> kernels are included so you can see the impact the scan rate adaption
> patch has and what that might mean for a placement policy using a proper
> feedback mechanism.
>
> The other two kernels were
>
> numacore-20121123 It was no longer clear what the deltas between releases
> and
> 	the dependencies might be so I just pulled tip/master on November
> 	23rd, 2012. An earlier pull had serious difficulties and the patch
> 	responsible has been dropped since. This is not a like-with-like
> 	comparison as the tree contains numerous other patches but it's
> 	the best available given the timeframe
>
> autonuma-v28fast This is a rebased version of Andrea's autonuma-v28fast
> 	branch with Hugh's THP migration patch on top.

FYI, based on how target huge page is selected,

+
+	new_page = alloc_pages_node(numa_node_id(),
+		(GFP_TRANSHUGE | GFP_THISNODE) & ~__GFP_WAIT, HPAGE_PMD_ORDER);

the thp replacement policy is changed to be MORON,

+	/* Migrate the page towards the node whose CPU is referencing it */
+	if (pol->flags & MPOL_F_MORON)
+		polnid = numa_node_id();


described in
	[PATCH 29/46] mm: numa: Migrate on reference policy
	https://lkml.org/lkml/2012/11/21/228

Hillf
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