[PATCH 04/11] mm: page_alloc: introduce alloc_contig_range()

[Michal Nazarewicz]

> On Thu, Dec 29, 2011 at 01:39:05PM +0100, Marek Szyprowski wrote:
>> From: Michal Nazarewicz <mina86 at mina86.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 at csn.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?

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