linux-kernel - Re: numa/core regressions fixed

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Date:	Wed, 21 Nov 2012 20:45:55 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Hugh Dickins <hughd@...gle.com>
Cc:	Rik van Riel <riel@...hat.com>, habanero@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Mel Gorman <mgorman@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: numa/core regressions fixed - more testers wanted

On Wed, Nov 21, 2012 at 12:10 PM, Hugh Dickins <hughd@...gle.com> wrote:
> On Tue, 20 Nov 2012, Rik van Riel wrote:
>> On 11/20/2012 08:54 PM, Andrew Theurer wrote:
>>
>> > I can confirm single JVM JBB is working well for me.  I see a 30%
>> > improvement over autoNUMA.  What I can't make sense of is some perf
>> > stats (taken at 80 warehouses on 4 x WST-EX, 512GB memory):
>>
>> AutoNUMA does not have native THP migration, that may explain some
>> of the difference.

Plus, numa/core is sucking the milk of TLB-flsh-optimization from Rik.

BTW, I want to see results of numa/core without such TLB boosts.

>
> When I made some fixes to the sched/numa native THP migration,
> I did also try porting that (with Hannes's memcg fixes) to AutoNUMA.
>
Thanks a ton;)

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

Such a brand new page is selected to be migration target, why?

Hillf
> +       if (!new_page)
> +               goto alloc_fail;
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