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Date: Mon, 2 Jun 2014 15:23:45 +0900
From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Subject: Re: [PATCH v2 2/3] CMA: aggressively allocate the pages on cma
 reserved memory when not used
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To: Gioh Kim <gioh.kim@lge.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Rik van Riel <riel@redhat.com>, Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mgorman@suse.de>, Laura Abbott <lauraa@codeaurora.org>, Minchan Kim <minchan@kernel.org>, Heesub Shin <heesub.shin@samsung.com>, Marek Szyprowski <m.szyprowski@samsung.com>, Michal Nazarewicz <mina86@mina86.com>, "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>, Linux Memory Management List <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>, =?utf-8?B?7J206rG07Zi4?= <gunho.lee@lge.com>

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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