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Message-ID: <20160805120243.GI19514@jhogan-linux.le.imgtec.org>
Date:	Fri, 5 Aug 2016 13:02:43 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Mel Gorman <mgorman@...hsingularity.net>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux-MM <linux-mm@...ck.org>, Rik van Riel <riel@...riel.com>,
	Vlastimil Babka <vbabka@...e.cz>,
	"Johannes Weiner" <hannes@...xchg.org>,
	Minchan Kim <minchan@...nel.org>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	metag <linux-metag@...r.kernel.org>
Subject: Re: [PATCH 03/34] mm, vmscan: move LRU lists to node

On Fri, Aug 05, 2016 at 12:55:26PM +0100, Mel Gorman wrote:
> On Fri, Aug 05, 2016 at 11:52:57AM +0100, James Hogan wrote:
> > > What's surprising is that it worked for the zone stats as it appears
> > > that calling zone_reclaimable() from that context should also have
> > > broken. Did anything change recently that would have avoided the
> > > zone->pageset dereference in zone_reclaimable() before?
> > 
> > It appears that zone_pcp_init() was already setting zone->pageset to
> > &boot_pageset, via paging_init():
> > 
> 
> /me slaps self
> 
> Of course.
> 
> > > The easiest option would be to not call show_mem from arch code until
> > > after the pagesets are setup.
> > 
> > Since no other arches seem to do show_mem earily during boot like metag,
> > and doing so doesn't really add much value, I'm happy to remove it
> > anyway.
> > 
> 
> Thanks. Can I assume you'll merge such a patch or should I roll one?

Yep, I'll take care of it.

> 
> > However could your change break other things and need fixing anyway?
> > 
> 
> Not that I'm aware of. There would have to be a node-based stat that has
> meaning that early in boot to have an effect. If one happened to added
> then it would need fixing but until then the complexity is unnecessary.

Okay, thanks for the help,

Cheers
James

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