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

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Message-Id: <201211192236.32152.maciej.rutecki@gmail.com>
Date:	Mon, 19 Nov 2012 22:36:31 +0100
From:	Maciej Rutecki <maciej.rutecki@...il.com>
To:	Jiang Liu <liuj97@...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

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
-- 
Maciej Rutecki
http://www.mrutecki.pl
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