linux-kernel - Re: [PATCH v2 1/2] mm: cma: split cma-reserved in dmesg log

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Date:	Mon, 3 Nov 2014 15:57:21 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Pintu Kumar <pintu.k@...sung.com>
cc:	akpm@...ux-foundation.org, riel@...hat.com, aquini@...hat.com,
	paul.gortmaker@...driver.com, jmarchan@...hat.com,
	lcapitulino@...hat.com, kirill.shutemov@...ux.intel.com,
	m.szyprowski@...sung.com, aneesh.kumar@...ux.vnet.ibm.com,
	iamjoonsoo.kim@....com, mina86@...a86.com, lauraa@...eaurora.org,
	gioh.kim@....com, mgorman@...e.de, hannes@...xchg.org,
	vbabka@...e.cz, sasha.levin@...cle.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	pintu_agarwal@...oo.com, cpgs@...sung.com, vishnu.ps@...sung.com,
	rohit.kr@...sung.com, ed.savinay@...sung.com
Subject: Re: [PATCH v2 1/2] mm: cma: split cma-reserved in dmesg log

On Wed, 22 Oct 2014, Pintu Kumar wrote:

> diff --git a/include/linux/cma.h b/include/linux/cma.h
> index 0430ed0..0b75896 100644
> --- a/include/linux/cma.h
> +++ b/include/linux/cma.h
> @@ -15,6 +15,7 @@
>  
>  struct cma;
>  
> +extern unsigned long totalcma_pages;
>  extern phys_addr_t cma_get_base(struct cma *cma);
>  extern unsigned long cma_get_size(struct cma *cma);
>  
> diff --git a/mm/cma.c b/mm/cma.c
> index 963bc4a..8435762 100644
> --- a/mm/cma.c
> +++ b/mm/cma.c
> @@ -288,6 +288,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
>  	if (ret)
>  		goto err;
>  
> +	totalcma_pages += (size / PAGE_SIZE);
>  	pr_info("Reserved %ld MiB at %08lx\n", (unsigned long)size / SZ_1M,
>  		(unsigned long)base);
>  	return 0;
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index dd73f9a..ababbd8 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -110,6 +110,7 @@ static DEFINE_SPINLOCK(managed_page_count_lock);
>  
>  unsigned long totalram_pages __read_mostly;
>  unsigned long totalreserve_pages __read_mostly;
> +unsigned long totalcma_pages __read_mostly;

Shouldn't this be __initdata instead?

>  /*
>   * When calculating the number of globally allowed dirty pages, there
>   * is a certain number of per-zone reserves that should not be
> @@ -5520,7 +5521,7 @@ void __init mem_init_print_info(const char *str)
>  
>  	pr_info("Memory: %luK/%luK available "
>  	       "(%luK kernel code, %luK rwdata, %luK rodata, "
> -	       "%luK init, %luK bss, %luK reserved"
> +	       "%luK init, %luK bss, %luK reserved, %luK cma-reserved"
>  #ifdef	CONFIG_HIGHMEM
>  	       ", %luK highmem"
>  #endif
> @@ -5528,7 +5529,8 @@ void __init mem_init_print_info(const char *str)
>  	       nr_free_pages() << (PAGE_SHIFT-10), physpages << (PAGE_SHIFT-10),
>  	       codesize >> 10, datasize >> 10, rosize >> 10,
>  	       (init_data_size + init_code_size) >> 10, bss_size >> 10,
> -	       (physpages - totalram_pages) << (PAGE_SHIFT-10),
> +	       (physpages - totalram_pages - totalcma_pages) << (PAGE_SHIFT-10),
> +	       totalcma_pages << (PAGE_SHIFT-10),
>  #ifdef	CONFIG_HIGHMEM
>  	       totalhigh_pages << (PAGE_SHIFT-10),
>  #endif
--
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