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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