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

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Date:	Mon, 19 Nov 2012 00:07:25 +0800
From:	Jiang Liu <liuj97@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	David Rientjes <rientjes@...gle.com>
Cc:	Jiang Liu <jiang.liu@...wei.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: [RFT PATCH v1 0/5] fix up inaccurate zone->present_pages

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(-)

-- 
1.7.9.5

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