linux-kernel - Re: [PATCH v5, part4 12/41] mm/ARC: prepare for removing num_physpages and simplify mem

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Date:	Wed, 29 May 2013 21:05:43 +0800
From:	Liu Jiang <liuj97@...il.com>
To:	Vineet Gupta <vineet.gupta1@...opsys.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Jiang Liu <jiang.liu@...wei.com>,
	David Rientjes <rientjes@...gle.com>,
	Wen Congyang <wency@...fujitsu.com>,
	Mel Gorman <mgorman@...e.de>, Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	James Bottomley <james.bottomley@...senpartnership.com>,
	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>,
	David Howells <dhowells@...hat.com>,
	Mark Salter <msalter@...hat.com>,
	Jianguo Wu <wujianguo@...wei.com>, linux-mm@...ck.org,
	linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org,
	James Hogan <james.hogan@...tec.com>,
	Rob Herring <rob.herring@...xeda.com>
Subject: Re: [PATCH v5, part4 12/41] mm/ARC: prepare for removing num_physpages
 and simplify mem_init()

On Wed 29 May 2013 04:41:30 PM CST, Vineet Gupta wrote:
> Hi Jiang,
>
> On 05/08/2013 09:21 PM, Jiang Liu wrote:
>> Prepare for removing num_physpages and simplify mem_init().
>>
>> Signed-off-by: Jiang Liu <jiang.liu@...wei.com>
>> Cc: Vineet Gupta <vgupta@...opsys.com>
>> Cc: James Hogan <james.hogan@...tec.com>
>> Cc: Rob Herring <rob.herring@...xeda.com>
>> Cc: linux-kernel@...r.kernel.org
>> ---
>>  arch/arc/mm/init.c |   36 +++---------------------------------
>>  1 file changed, 3 insertions(+), 33 deletions(-)
>>
>> diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
>> index 78d8c31..8ba6562 100644
>> --- a/arch/arc/mm/init.c
>> +++ b/arch/arc/mm/init.c
>> @@ -74,7 +74,7 @@ void __init setup_arch_memory(void)
>>  	/* Last usable page of low mem (no HIGHMEM yet for ARC port) */
>>  	max_low_pfn = max_pfn = PFN_DOWN(end_mem);
>>
>> -	max_mapnr = num_physpages = max_low_pfn - min_low_pfn;
>> +	max_mapnr = max_low_pfn - min_low_pfn;
>>
>>  	/*------------- reserve kernel image -----------------------*/
>>  	memblock_reserve(CONFIG_LINUX_LINK_BASE,
>> @@ -84,7 +84,7 @@ void __init setup_arch_memory(void)
>>
>>  	/*-------------- node setup --------------------------------*/
>>  	memset(zones_size, 0, sizeof(zones_size));
>> -	zones_size[ZONE_NORMAL] = num_physpages;
>> +	zones_size[ZONE_NORMAL] = max_low_pfn - min_low_pfn;
>>
>>  	/*
>>  	 * We can't use the helper free_area_init(zones[]) because it uses
>> @@ -106,39 +106,9 @@ void __init setup_arch_memory(void)
>>   */
>>  void __init mem_init(void)
>>  {
>> -	int codesize, datasize, initsize, reserved_pages, free_pages;
>> -	int tmp;
>> -
>>  	high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
>> -
>>  	free_all_bootmem();
>> -
>
> What baseline is this code against, since mainline looks like following:
>
>        high_memory = (void *)(CONFIG_LINUX_LINK_BASE + arc_mem_sz);
>
>        totalram_pages = free_all_bootmem();
>
> So I would handve expected the following
>
> -       totalram_pages = free_all_bootmem();
> +	free_all_bootmem();
>
> Aha, you missed out CCing all maintainers on "[PATCH v7, part3 14/16]" or rather
> "[PATCH v8, part3 13/14]" - and it is difficult to dig this out from all the
> patches that fly by on linux-arch.
>
> Same goes for "[PATCH v8, part3 01/14]" and "[PATCH v8, part3 02/14]"
Hi Vineet,
      This patchset is based on Andrew's mmotm tree, there are some 
differences
between mmotm and the upstream kernel, sorry for the inconvenience.
      Once I sent those common patches to all related maintainers, but 
the CC list
is too long and also caused other troubles. Next time I will send all 
patches to
linux-arch maillist.

>
>> -	/* count all reserved pages [kernel code/data/mem_map..] */
>> -	reserved_pages = 0;
>> -	for (tmp = 0; tmp < max_mapnr; tmp++)
>> -		if (PageReserved(mem_map + tmp))
>> -			reserved_pages++;
>> -
>> -	/* XXX: nr_free_pages() is equivalent */
>> -	free_pages = max_mapnr - reserved_pages;
>> -
>> -	/*
>> -	 * For the purpose of display below, split the "reserve mem"
>> -	 * kernel code/data is already shown explicitly,
>> -	 * Show any other reservations (mem_map[ ] et al)
>> -	 */
>> -	reserved_pages -= (((unsigned int)_end - CONFIG_LINUX_LINK_BASE) >>
>> -								PAGE_SHIFT);
>> -
>> -	codesize = _etext - _text;
>> -	datasize = _end - _etext;
>> -	initsize = __init_end - __init_begin;
>> -
>> -	pr_info("Memory Available: %dM / %ldM (%dK code, %dK data, %dK init, %dK reserv)\n",
>> -		PAGES_TO_MB(free_pages),
>> -		TO_MB(arc_mem_sz),
>> -		TO_KB(codesize), TO_KB(datasize), TO_KB(initsize),
>> -		PAGES_TO_KB(reserved_pages));
>> +	mem_init_print_info(NULL);
>>  }
>>
>>  /*
>>
>
> The Changes look OK though. I managed to build your github tree (mem_init_v5
> branch). And it seems to work ok.
>
> Acked-by: Vineet Gupta <vgupta@...opsys.com>   # for arch/arc
Thanks for review and tests!
Regards!
Gerry

>
> Thx
> -Vineet


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