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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Message-ID: <20090428165129.GA18893@csn.ul.ie>
Date:	Tue, 28 Apr 2009 17:51:29 +0100
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux.com>
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, Apr 28, 2009 at 12:37:22PM -0400, Christoph Lameter wrote:
> 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.
> 

Matches other call sites such as in __offline_isolated_pages(), habit when
using shifts like this and matches other locations, paranoia, doesn't hurt.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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