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

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Date:	Mon, 02 Jun 2014 16:13:19 +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 Memory Management List <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	이건호 <gunho.lee@....com>
Subject: Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma reserved
 memory when not used

I'm not sure what I'm doing wrong.
These are my code.

  770 #ifdef CONFIG_CMA
  771 void adjust_managed_cma_page_count(struct zone *zone, long count)
  772 {
  773         unsigned long flags;
  774         long total, cma, movable;
  775
  776         spin_lock_irqsave(&zone->lock, flags);
  777
  778         zone->managed_cma_pages += count;
  779
  780         total = zone->managed_pages;
  781         cma = zone->managed_cma_pages;
  782         movable = total - cma - high_wmark_pages(zone);
  783
  784         printk("count=%ld total=%ld cma=%ld movable=%ld\n",
  785                count, total, cma, movable);
  786


2014-06-02 오후 3:23, Joonsoo Kim 쓴 글:
> On Mon, Jun 02, 2014 at 02:54:30PM +0900, Gioh Kim wrote:
>> I found 2 problems at my platform.
>>
>> 1st is occured when I set CMA size 528MB and total memory is 960MB.
>> I print some values in adjust_managed_cma_page_count(),
>> the total value becomes 105439 and cma value 131072.
>> Finally movable value becomes negative value.
>>
>> The total value 105439 means 411MB.
>> Is the zone->managed_pages value pages amount except the CMA?
>> I think zone->managed_pages value is including CMA size but it's value is strange.
>
> Hmm...
> zone->managed_pages includes nr of CMA pages.
> Is there any mistake about your printk?
>
>>
>> 2nd is a kernel panic at __netdev_alloc_skb().
>> I'm not sure it is caused by the CMA.
>> I'm checking it again and going to send you another report with detail call-stacks.
>
> Okay.
>
> Thanks.
>
>
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