Re: [PATCH 1/3] CMA: Fix the bug that CMA's page number is substructed twice

From: Hui Zhu
Date: Tue Dec 30 2014 - 05:02:53 EST

On Tue, Dec 30, 2014 at 12:48 PM, Joonsoo Kim <> wrote:
> On Thu, Dec 25, 2014 at 05:43:26PM +0800, Hui Zhu wrote:
>> In Joonsoo's CMA patch "CMA: always treat free cma pages as non-free on
>> watermark checking" [1], it changes __zone_watermark_ok to substruct CMA
>> pages number from free_pages if system use CMA:
>> if (IS_ENABLED(CONFIG_CMA) && z->managed_cma_pages)
>> free_pages -= zone_page_state(z, NR_FREE_CMA_PAGES);
> Hello,
> In fact, without that patch, watermark checking has a problem in current kernel.
> If there is reserved CMA region, watermark check for high order
> allocation is done loosly. See following thread.
> Your patch can fix this situation, so, how about submitting this patch
> separately?
> Thanks.

Hi Joonsoo,

Thanks for your remind. I will post a separate patch for current kernel.

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