linux-kernel - Re: [RFC PATCH 0/7] Configurable fair allocation zone policy v2r6

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Date:	Tue, 17 Dec 2013 21:23:27 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	Zlatko Calusic <zcalusic@...sync.net>
Cc:	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dave Hansen <dave.hansen@...el.com>,
	Rik van Riel <riel@...hat.com>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC PATCH 0/7] Configurable fair allocation zone policy v2r6

On Tue, Dec 17, 2013 at 04:07:35PM +0100, Zlatko Calusic wrote:
> On 13.12.2013 15:10, Mel Gorman wrote:
> >Kicked this another bit today. It's still a bit half-baked but it restores
> >the historical performance and leaves the door open at the end for playing
> >nice with distributing file pages between nodes. Finishing this series
> >depends on whether we are going to make the remote node behaviour of the
> >fair zone allocation policy configurable or redefine MPOL_LOCAL. I'm in
> >favour of the configurable option because the default can be redefined and
> >tested while giving users a "compat" mode if we discover the new default
> >behaviour sucks for some workload.
> >
> 
> I'll start a 5-day test of this patchset in a few hours, unless you
> can send an updated one in the meantime. I intend to test it on a
> rather boring 4GB x86_64 machine that before Johannes' work had lots
> of trouble balancing zones. Would you recommend to use the default
> settings, i.e. don't mess with tunables at this point?
> 

For me at least I would prefer you tested v3 of the series with the
default settings of not interleaving file-backed pages on remote nodes
by default. Johannes might request testing with that knob enabled if the
machine is NUMA although I doubt it is with 4G of RAM.

Thanks.

-- 
Mel Gorman
SUSE Labs
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