linux-kernel - Re: [RFT PATCH v1 0/5] fix up inaccurate zone->present

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Message-ID: <50AAFD0D.2010003@huawei.com>
Date:	Tue, 20 Nov 2012 11:46:21 +0800
From:	Jiang Liu <jiang.liu@...wei.com>
To:	Jaegeuk Hanse <jaegeuk.hanse@...il.com>
CC:	Jiang Liu <liuj97@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Maciej Rutecki <maciej.rutecki@...il.com>,
	Chris Clayton <chris2553@...glemail.com>,
	"Rafael J . Wysocki" <rjw@...k.pl>, Mel Gorman <mgorman@...e.de>,
	Minchan Kim <minchan@...nel.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Jianguo Wu <wujianguo@...wei.com>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [RFT PATCH v1 0/5] fix up inaccurate zone->present_pages

On 2012-11-20 11:20, Jaegeuk Hanse wrote:
> On 11/20/2012 10:43 AM, Jiang Liu wrote:
>> On 2012-11-20 10:13, Jaegeuk Hanse wrote:
>>> On 11/19/2012 12:07 AM, Jiang Liu wrote:
>> Hi Jaegeuk,
>>     Thanks for review this patch set.
>>     Currently x86/x86_64/Sparc have been converted to use nobootmem.c,
>> and other Arches still use bootmem.c. So need to test it on other Arches,
>> such as ARM etc. Yesterday we have tested it patchset on an Itanium platform,
>> so bootmem.c should work as expected too.
> 
> Hi Jiang,
> 
> If there are any codes changed in x86/x86_64  to meet nobootmem.c logic? I mean if remove
> config NO_BOOTMEM
>        def_bool y
> in arch/x86/Kconfig, whether x86/x86_64 can take advantage of bootmem.c or not.
There are code change in x86/x86_64 arch directory to convert from bootmem.c
to nobootmem.c, so you can't simply comment out NO_BOOTMEM Kconfig item.
There are differences in APIs for bootmem.c and nobootmem.c.
For example, free_low_memory_core_early() is only provided by nobootmem.c
and init_bootmem_node() is only provided by bootmem.c.
Thanks!

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