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

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Message-ID: <50ABA9B7.7020702@gmail.com>
Date:	Wed, 21 Nov 2012 00:03:03 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	maciej.rutecki@...il.com
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>,
	Jiang Liu <jiang.liu@...wei.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

Thanks, Maciej!

On 11/20/2012 05:36 AM, Maciej Rutecki wrote:
> On niedziela, 18 listopada 2012 o 17:07:25 Jiang Liu wrote:
>> The commit 7f1290f2f2a4 ("mm: fix-up zone present pages") tries to
>> resolve an issue caused by inaccurate zone->present_pages, but that
>> fix is incomplete and causes regresions with HIGHMEM. And it has been
>> reverted by commit
>> 5576646 revert "mm: fix-up zone present pages"
>>
>> This is a following-up patchset for the issue above. It introduces a
>> new field named "managed_pages" to struct zone, which counts pages
>> managed by the buddy system from the zone. And zone->present_pages
>> is used to count pages existing in the zone, which is
>> 	spanned_pages - absent_pages.
>>
>> But that way, zone->present_pages will be kept in consistence with
>> pgdat->node_present_pages, which is sum of zone->present_pages.
>>
>> This patchset has only been tested on x86_64 with nobootmem.c. So need
>> help to test this patchset on machines:
>> 1) use bootmem.c
>> 2) have highmem
>>
>> This patchset applies to "f4a75d2e Linux 3.7-rc6" from
>> git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>>
>> Any comments and helps are welcomed!
>>
>> Jiang Liu (5):
>>   mm: introduce new field "managed_pages" to struct zone
>>   mm: replace zone->present_pages with zone->managed_pages if
>>     appreciated
>>   mm: set zone->present_pages to number of existing pages in the zone
>>   mm: provide more accurate estimation of pages occupied by memmap
>>   mm: increase totalram_pages when free pages allocated by bootmem
>>     allocator
>>
>>  include/linux/mmzone.h |    1 +
>>  mm/bootmem.c           |   14 ++++++++
>>  mm/memory_hotplug.c    |    6 ++++
>>  mm/mempolicy.c         |    2 +-
>>  mm/nobootmem.c         |   15 ++++++++
>>  mm/page_alloc.c        |   89
>> +++++++++++++++++++++++++++++++----------------- mm/vmscan.c            | 
>>  16 ++++-----
>>  mm/vmstat.c            |    8 +++--
>>  8 files changed, 108 insertions(+), 43 deletions(-)
> Tested in 32 bit linux with HIGHMEM. Seems be OK.
> 
> Regards
> 

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