linux-kernel - Re: [RFC PATCH v1 00/19] kill free_all_bootmem() and clean up VALID

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Message-ID: <516D6870.1010303@gmail.com>
Date:	Tue, 16 Apr 2013 23:04:16 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Paul Mackerras <paulus@...ba.org>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Yinghai Lu <yinghai@...nel.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>,
	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
Subject: Re: [RFC PATCH v1 00/19] kill free_all_bootmem() and clean up VALID_PAGE()

On 04/15/2013 12:56 PM, Paul Mackerras wrote:
> On Sat, Apr 13, 2013 at 11:36:20PM +0800, Jiang Liu wrote:
>> Commit 600cc5b7f6 "mm: Kill NO_BOOTMEM version free_all_bootmem_node()"
>> has kill free_all_bootmem_node() for NO_BOOTMEM.
>>
>> Currently the usage pattern for free_all_bootmem_node() is like:
>> for_each_online_pgdat(pgdat)
>> 	free_all_bootmem_node(pgdat);
>>
>> It's equivalent to free_all_bootmem(), so this patchset goes one
>> step further to kill free_all_bootmem_node() for BOOTMEM too.
>>
>> This patchset also tries to clean up code and comments related to
>> VALID_PAGE() because it has been removed from kernel long time ago.
>>
>> Patch 1-11:
>> 	Kill free_all_bootmem_node()
>> Patch 12-16:
>> 	Clean up code and comments related to VALID_PAGE()
>> Patch 17:
>> 	Fix a minor build warning for m68k
>> Patch 18:
>> 	merge Alpha's mem_init() for UMA and NUMA.
>> Patch 19:
>> 	call register_page_bootmem_info_node() from mm core
> 
> How does this not break bisection?  Will a kernel still boot with
> patches 1-11 applied but not patch 19?  As far as I can see such a
> kernel would have no memory available to it after mem_init() time
> and would therefore crash early in boot.
Hi Paul,
	Thanks for review!
	Patch 1-11 replace free_all_bootmem_node() with free_all_bootmem(),
so all normal pages will be freed into the buddy system as before. And
patch 1-11 are independent with patch 19.
	Gerry
> 
> Paul.
> 

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