linux-kernel - Re: [PATCH] Properly account for freed pages in free_pages_bulk() and when allocating high-order pages in buffered

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Date:	Tue, 28 Apr 2009 12:37:22 -0400 (EDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Mel Gorman <mel@....ul.ie>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Subject: Re: [PATCH] Properly account for freed pages in free_pages_bulk()
 and when allocating high-order pages in buffered_rmqueue()

On Tue, 28 Apr 2009, Mel Gorman wrote:

> @@ -1151,6 +1151,7 @@ again:
>  	} else {
>  		spin_lock_irqsave(&zone->lock, flags);
>  		page = __rmqueue(zone, order, migratetype);
> +		__mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order));
>  		spin_unlock(&zone->lock);
>  		if (!page)
>  			goto failed;

__mod_zone_page_state takes an signed integer argument. Not sure what is
won by the UL suffix here.

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