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

[Gioh Kim]

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 ìí 3:23, Joonsoo Kim ì ê:
> 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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