linux-kernel - Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma reserved memory when not used

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Date:	Thu, 29 May 2014 17:09:34 +0900
From:	Gioh Kim <gioh.kim@....com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Mel Gorman <mgorman@...e.de>,
	Laura Abbott <lauraa@...eaurora.org>,
	Minchan Kim <minchan@...nel.org>,
	Heesub Shin <heesub.shin@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Michal Nazarewicz <mina86@...a86.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma reserved
 memory when not used


>>> +
>>>    /*
>>>     * Do the hard work of removing an element from the buddy allocator.
>>>     * Call me with the zone->lock already held.
>>> @@ -1143,10 +1223,15 @@ __rmqueue_fallback(struct zone *zone, int order, int start_migratetype)
>>>    static struct page *__rmqueue(struct zone *zone, unsigned int order,
>>>    						int migratetype)
>>>    {
>>> -	struct page *page;
>>> +	struct page *page = NULL;
>>> +
>>> +	if (IS_ENABLED(CONFIG_CMA) &&
>>
>> You might know that CONFIG_CMA is enabled and there is no CMA memory, because CONFIG_CMA_SIZE_MBYTES can be zero.
>> Is IS_ENABLED(CONFIG_CMA) alright in that case?
>
> next line checks whether zone->managed_cma_pages is positive or not.
> If there is no CMA memory, zone->managed_cma_pages will be zero and
> we will skip to call __rmqueue_cma().

Is IS_ENABLED(CONFIG_CMA) necessary?
What about if (migratetype == MIGRATE_MOVABLE && zone->managed_cma_pages) ?

>
> Thanks for review!!!
>
> Thanks.
>
>
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