linux-kernel - Re: [PATCH v3 04/13] mm, compaction: move pageblock checks up from isolate_migratepages

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Date:	Tue, 24 Jun 2014 17:34:32 +0200
From:	Vlastimil Babka <vbabka@...e.cz>
To:	Naoya Horiguchi <n-horiguchi@...jp.nec.com>
CC:	linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Minchan Kim <minchan@...nel.org>, Mel Gorman <mgorman@...e.de>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Michal Nazarewicz <mina86@...a86.com>,
	Christoph Lameter <cl@...ux.com>,
	Rik van Riel <riel@...hat.com>,
	Zhang Yanfei <zhangyanfei@...fujitsu.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 04/13] mm, compaction: move pageblock checks up from
 isolate_migratepages_range()

On 06/24/2014 06:52 AM, Naoya Horiguchi wrote:
>> -	low_pfn = isolate_migratepages_range(zone, cc, low_pfn, end_pfn, false);
>> -	if (!low_pfn || cc->contended)
>> -		return ISOLATE_ABORT;
>> +		/* Do not scan within a memory hole */
>> +		if (!pfn_valid(low_pfn))
>> +			continue;
>> +
>> +		page = pfn_to_page(low_pfn);
>
> Can we move (page_zone != zone) check here as isolate_freepages() does?

Duplicate perhaps, not sure about move. Does CMA make sure that all 
pages are in the same zone? Common sense tells me it would be useless 
otherwise, but I haven't checked if we can rely on it.

> Thanks,
> Naoya Horiguchi
>

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