linux-kernel - Re: [PATCH 04/11] mm: page_alloc: introduce alloc_contig

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Date:	Mon, 16 Jan 2012 09:01:10 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Michal Nazarewicz <mina86@...a86.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Russell King <linux@....linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Daniel Walker <dwalker@...eaurora.org>,
	Arnd Bergmann <arnd@...db.de>,
	Jesse Barker <jesse.barker@...aro.org>,
	Jonathan Corbet <corbet@....net>,
	Shariq Hasnain <shariq.hasnain@...aro.org>,
	Chunsang Jeong <chunsang.jeong@...aro.org>,
	Dave Hansen <dave@...ux.vnet.ibm.com>,
	Benjamin Gaignard <benjamin.gaignard@...aro.org>
Subject: Re: [PATCH 04/11] mm: page_alloc: introduce alloc_contig_range()

On Fri, Jan 13, 2012 at 09:04:31PM +0100, Michal Nazarewicz wrote:
> >On Thu, Dec 29, 2011 at 01:39:05PM +0100, Marek Szyprowski wrote:
> >>From: Michal Nazarewicz <mina86@...a86.com>
> >>+	/* Make sure all pages are isolated. */
> >>+	if (!ret) {
> >>+		lru_add_drain_all();
> >>+		drain_all_pages();
> >>+		if (WARN_ON(test_pages_isolated(start, end)))
> >>+			ret = -EBUSY;
> >>+	}
> 
> On Tue, 10 Jan 2012 15:16:13 +0100, Mel Gorman <mel@....ul.ie> wrote:
> >Another global IPI seems overkill. Drain pages only from the local CPU
> >(drain_pages(get_cpu()); put_cpu()) and test if the pages are isolated.
> 
> Is get_cpu() + put_cpu() required? Won't drain_local_pages() work?
> 

drain_local_pages() calls smp_processor_id() without preemption
disabled. 

-- 
Mel Gorman
SUSE Labs
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