linux-kernel - Re: [PATCH] mm: skip the page buddy block instead of one page

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Date:	Wed, 14 Aug 2013 13:26:02 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Mel Gorman <mgorman@...e.de>, Xishi Qiu <qiuxishi@...wei.com>,
	riel@...hat.com, aquini@...hat.com, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: skip the page buddy block instead of one page

On Thu, 15 Aug 2013 00:52:29 +0900 Minchan Kim <minchan@...nel.org> wrote:

> On Wed, Aug 14, 2013 at 09:57:11AM +0100, Mel Gorman wrote:
> > On Wed, Aug 14, 2013 at 12:45:41PM +0800, Xishi Qiu wrote:
> > > A large free page buddy block will continue many times, so if the page 
> > > is free, skip the whole page buddy block instead of one page.
> > > 
> > > Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> > 
> > page_order cannot be used unless zone->lock is held which is not held in
> > this path. Acquiring the lock would prevent parallel allocations from the
> 
> Argh, I missed that.

I missed it as well. And so did Xishi Qiu.

Mel, we have a problem.  What can we do to make this code more
maintainable?
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