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

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Message-Id: <20101019192229.bae83d9d.akpm@linux-foundation.org>
Date:	Tue, 19 Oct 2010 19:22:29 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	David Rientjes <rientjes@...gle.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 Wed, 20 Oct 2010 11:07:33 +0900 (JST) KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com> wrote:

> > > > @@ -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.
> 
> Can we review this?

It's unclear what you mean?

The patches otherwise look OK to me, but it's pretty easy to make
mistakes in this area.

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