linux-kernel - Re: [PATCH 00/49] Automatic NUMA Balancing v10

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Date:	Tue, 11 Dec 2012 15:22:07 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Paul Turner <pjt@...gle.com>, Hillf Danton <dhillf@...il.com>,
	David Rientjes <rientjes@...gle.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Alex Shi <lkml.alex@...il.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Aneesh Kumar <aneesh.kumar@...ux.vnet.ibm.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 00/49] Automatic NUMA Balancing v10

On Tue, Dec 11, 2012 at 10:18:07AM +0100, Ingo Molnar wrote:
> 
> * Ingo Molnar <mingo@...nel.org> wrote:
> 
> > > This is prototype only but what I was using as a reference 
> > > to see could I spot a problem in yours. It has not been even 
> > > boot tested but avoids remote->remote copies, contending on 
> > > PTL or holding it longer than necessary (should anyway)
> > 
> > So ... because time is running out and it would be nice to 
> > progress with this for v3.8, I'd suggest the following 
> > approach:
> > 
> >  - Please send your current tree to Linus as-is. You already 
> >    have my Acked-by/Reviewed-by for its scheduler bits, and my
> >    testing found your tree to have no regression to mainline,
> >    plus it's a nice win in a number of NUMA-intense workloads.
> >    So it's a good, monotonic step forward in terms of NUMA
> >    balancing, very close to what the bits I'm working on need as
> >    infrastructure.
> > 
> >  - I'll rebase all my devel bits on top of it. Instead of
> >    removing the migration bandwidth I'll simply increase it for
> >    testing - this should trigger similarly aggressive behavior.
> >    I'll try to touch as little of the mm/ code as possible, to
> >    keep things debuggable.
> 
> One minor last-minute request/nit before you send it to Linus, 
> would you mind doing a:
> 
>    CONFIG_BALANCE_NUMA => CONFIG_NUMA_BALANCING
> 
> rename please? (I can do it for you if you don't have the time.)
> 
> CONFIG_NUMA_BALANCING is really what fits into our existing NUMA 
> namespace, CONFIG_NUMA, CONFIG_NUMA_EMU - and, more importantly, 
> the ordering of words follows the common generic -> less generic 
> ordering we do in the kernel for config names and methods.
> 
> So it would fit nicely into existing Kconfig naming schemes:
> 
>    CONFIG_TRACING
>    CONFIG_FILE_LOCKING
>    CONFIG_EVENT_TRACING
> 
> etc.
> 

Yes, that makes sense. I should have spotted the rationale. I also took
the liberty of renaming the command-line parameter and the variables to
be consistent with this.

-- 
Mel Gorman
SUSE Labs
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