linux-kernel - Re: [resend][PATCH 2/2] mm, mem-hotplug: update pcp->stat

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Message-Id: <20101019162940.6918506d.akpm@linux-foundation.org>
Date:	Tue, 19 Oct 2010 16:29:40 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Mel Gorman <mel@....ul.ie>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [resend][PATCH 2/2] mm, mem-hotplug: update pcp->stat_threshold
 when memory hotplug occur

On Tue, 19 Oct 2010 12:11:09 -0700 (PDT)
David Rientjes <rientjes@...gle.com> wrote:

> On Tue, 19 Oct 2010, KOSAKI Motohiro wrote:
> 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 14ee899..222d8cc 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -51,6 +51,7 @@
> >  #include <linux/kmemleak.h>
> >  #include <linux/memory.h>
> >  #include <linux/compaction.h>
> > +#include <linux/vmstat.h>
> >  #include <trace/events/kmem.h>
> >  #include <linux/ftrace_event.h>
> >  
> > @@ -5013,6 +5014,8 @@ int __meminit init_per_zone_wmark_min(void)
> >  		min_free_kbytes = 128;
> >  	if (min_free_kbytes > 65536)
> >  		min_free_kbytes = 65536;
> > +
> > +	refresh_zone_stat_thresholds();
> >  	setup_per_zone_wmarks();
> >  	setup_per_zone_lowmem_reserve();
> >  	setup_per_zone_inactive_ratio();
> 
> setup_per_zone_wmarks() could change the min and low watermarks for a zone 
> when refresh_zone_stat_thresholds() would have used the old value.

Indeed.

I could make the obvious fix, but then what I'd have wouldn't be
sufficiently tested.
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