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

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Message-ID: <20140602062344.GB7713@js1304-P5Q-DELUXE>
Date:	Mon, 2 Jun 2014 15:23:45 +0900
From:	Joonsoo Kim <iamjoonsoo.kim@....com>
To:	Gioh Kim <gioh.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

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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