linux-kernel - Re: [PATCH 3/3] reset wmark_min and inactive ratio of zone when hotplug happens

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Message-Id: <20090520170712.6CEE.E1E9C6FF@jp.fujitsu.com>
Date:	Wed, 20 May 2009 17:08:51 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Minchan Kim <minchan.kim@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Mel Gorman <mel@....ul.ie>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [PATCH 3/3] reset wmark_min and inactive ratio of zone when hotplug happens

> > This patch solve two problems.
> > 
> > Whenever memory hotplug sucessfully happens, zone->present_pages
> > have to be changed.
> > 
> > 1) Now, memory hotplug calls setup_per_zone_wmark_min only when
> > online_pages called, not offline_pages.
> > 
> > It breaks balance.
> > 
> > 2) If zone->present_pages is changed, we also have to change
> > zone->inactive_ratio. That's because inactive_ratio depends
> > on zone->present_pages.
> 
> Good catch!
> looks good to me. but I'm not familiar this area. CC to Goto-san.
> 

Thanks. Looks good!

Acked-by: Yasunori Goto <y-goto@...fujitsu.com>



> 
> 
> 
> 
> > CC: Mel Gorman <mel@....ul.ie>
> > CC: Rik van Riel <riel@...hat.com>
> > CC: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> > CC: Johannes Weiner <hannes@...xchg.org>
> > Signed-off-by: Minchan Kim <minchan.kim@...il.com>
> > ---
> >  mm/memory_hotplug.c |    4 ++++
> >  1 files changed, 4 insertions(+), 0 deletions(-)
> > 
> > diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> > index 40bf385..1611010 100644
> > --- a/mm/memory_hotplug.c
> > +++ b/mm/memory_hotplug.c
> > @@ -423,6 +423,7 @@ int online_pages(unsigned long pfn, unsigned long nr_pages)
> >  	zone->zone_pgdat->node_present_pages += onlined_pages;
> >  
> >  	setup_per_zone_wmark_min();
> > +	calculate_per_zone_inactive_ratio(zone);
> >  	if (onlined_pages) {
> >  		kswapd_run(zone_to_nid(zone));
> >  		node_set_state(zone_to_nid(zone), N_HIGH_MEMORY);
> > @@ -832,6 +833,9 @@ repeat:
> >  	totalram_pages -= offlined_pages;
> >  	num_physpages -= offlined_pages;
> >  
> > +	setup_per_zone_wmark_min();
> > +	calculate_per_zone_inactive_ratio(zone);
> > +
> >  	vm_total_pages = nr_free_pagecache_pages();
> >  	writeback_set_ratelimit();
> >  
> > -- 
> > 1.5.4.3
> > 
> > 
> > 
> > -- 
> > Kinds Regards
> > Minchan Kim
> 
> 
> 
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-- 
Yasunori Goto 


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