linux-kernel - Re: [RFC] memory hotremove patch take 2 [01/10] (counter of removable page)

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Message-ID: <Pine.LNX.4.64.0705101058260.10002@schroedinger.engr.sgi.com>
Date:	Thu, 10 May 2007 11:00:31 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Yasunori Goto <y-goto@...fujitsu.com>
cc:	linux-mm <linux-mm@...ck.org>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>, Mel Gorman <mel@....ul.ie>
Subject: Re: [RFC] memory hotremove patch take 2 [01/10] (counter of removable
 page)

On Wed, 9 May 2007, Yasunori Goto wrote:

>  
> +unsigned int nr_free_movable_pages(void)
> +{
> +	unsigned long nr_pages = 0;
> +	struct zone *zone;
> +	int nid;
> +
> +	for_each_online_node(nid) {
> +		zone = &(NODE_DATA(nid)->node_zones[ZONE_MOVABLE]);
> +		nr_pages += zone_page_state(zone, NR_FREE_PAGES);
> +	}
> +	return nr_pages;
> +}


Hmmmm... This is redoing what the vm counters already provide

Could you add

NR_MOVABLE_PAGES etc.

instead and then let the ZVC counter logic take care of the rest?

With a ZVC you will have the numbers in each zone and also in 
/proc/vmstat.

(Additional ulterior motive: If we ever get away from ZONE_MOVABLE and 
make movable a portion of each zone then this will still work)
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