linux-kernel - Re: [PATCH] ARM: print cma-reserved pages from show

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Date:	Fri, 6 Feb 2015 13:14:42 -0800
From:	Gregory Fong <gregory.0xf0@...il.com>
To:	Laura Abbott <lauraa@...eaurora.org>
Cc:	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Florian Fainelli <f.fainelli@...il.com>, vishnu.ps@...sung.com,
	Russell King <linux@....linux.org.uk>,
	Nicolas Pitre <nico@...aro.org>,
	Kees Cook <keescook@...omium.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Yalin Wang <Yalin.Wang@...ymobile.com>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] ARM: print cma-reserved pages from show_mem

On Thu, Feb 5, 2015 at 4:41 PM, Laura Abbott <lauraa@...eaurora.org> wrote:
> On 2/4/2015 3:22 PM, Gregory Fong wrote:
>>
>> Add cma reserved information to the ARM-specific show_mem.  It was
>> added to the generic implementation by commit
>> 49abd8c28046adf77c5ce1949549aa64d7221881 "lib/show_mem.c: add cma
>> reserved information".
>>
>> Signed-off-by: Gregory Fong <gregory.0xf0@...il.com>
>> ---
>>   arch/arm/mm/init.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
>> index 2495c8c..da77507 100644
>> --- a/arch/arm/mm/init.c
>> +++ b/arch/arm/mm/init.c
>> @@ -22,6 +22,7 @@
>>   #include <linux/memblock.h>
>>   #include <linux/dma-contiguous.h>
>>   #include <linux/sizes.h>
>> +#include <linux/cma.h>
>>
>>   #include <asm/cp15.h>
>>   #include <asm/mach-types.h>
>> @@ -130,6 +131,9 @@ void show_mem(unsigned int filter)
>>         printk("%d pages of RAM\n", total);
>>         printk("%d free pages\n", free);
>>         printk("%d reserved pages\n", reserved);
>> +#ifdef CONFIG_CMA
>> +       printk("%lu cma reserved pages\n", totalcma_pages);
>> +#endif
>
>
> Nit: 'cma reserved pages' is a bit unclear. Are there some CMA
> pages that aren't reserved? Dropping the reserved might be
> clearer.

Sure, I was trying to replicate what's in lib/show_mem.c, but it
doesn't actually make much sense.  Maybe it would be better to change
to "cma pages" here and change the wording in that lib/show_mem.c too.

I'll wait a bit for any other thoughts and send out a v2 with those changes.

Thanks,
Gregory
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