Subject: + mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages.patch added to -mm tree
To: liwanp@xxxxxxxxxxxxxxxxxx,kamezawa.hiroyu@xxxxxxxxxxxxxx,mhocko@xxxxxxx,rientjes@xxxxxxxxxx,stable@xxxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Tue, 28 May 2013 16:02:04 -0700
The patch titled
Subject: mm/memory-hotplug: fix lowmem count overflow when offline pages
has been added to the -mm tree. Its filename is
mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages.patch
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------------------------------------------------------
From: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Subject: mm/memory-hotplug: fix lowmem count overflow when offline pages
Logic memory-remove code fails to correctly account the Total High Memory
when a memory block which contains High Memory is offlined as shown in the
example below. The following patch fixes it.
Before logic memory remove:
MemTotal: 7603740 kB
MemFree: 6329612 kB
Buffers: 94352 kB
Cached: 872008 kB
SwapCached: 0 kB
Active: 626932 kB
Inactive: 519216 kB
Active(anon): 180776 kB
Inactive(anon): 222944 kB
Active(file): 446156 kB
Inactive(file): 296272 kB
Unevictable: 0 kB
Mlocked: 0 kB
HighTotal: 7294672 kB
HighFree: 5704696 kB
LowTotal: 309068 kB
LowFree: 624916 kB
After logic memory remove:
MemTotal: 7079452 kB
MemFree: 5805976 kB
Buffers: 94372 kB
Cached: 872000 kB
SwapCached: 0 kB
Active: 626936 kB
Inactive: 519236 kB
Active(anon): 180780 kB
Inactive(anon): 222944 kB
Active(file): 446156 kB
Inactive(file): 296292 kB
Unevictable: 0 kB
Mlocked: 0 kB
HighTotal: 7294672 kB
HighFree: 5181024 kB
LowTotal: 4294752076 kB
LowFree: 624952 kB
Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Michal Hocko <mhocko@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> [2.6.24+]
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/page_alloc.c | 2 ++
1 file changed, 2 insertions(+)
diff -puN mm/page_alloc.c~mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages mm/page_alloc.c
--- a/mm/page_alloc.c~mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages
+++ a/mm/page_alloc.c
@@ -6196,6 +6196,8 @@ __offline_isolated_pages(unsigned long s
list_del(&page->lru);
rmv_page_order(page);
zone->free_area[order].nr_free--;
+ if (PageHighMem(page))
+ totalhigh_pages -= 1 << order;
for (i = 0; i < (1 << order); i++)
SetPageReserved((page+i));
pfn += (1 << order);
_
Patches currently in -mm which might be from liwanp@xxxxxxxxxxxxxxxxxx are
mm-memory-hotplug-fix-lowmem-count-overflow-when-offline-pages.patch
mm-pageblock-remove-get-set_pageblock_flags.patch
mm-hugetlb-remove-hugetlb_prefault.patch
mm-hugetlb-use-already-exist-interface-huge_page_shift.patch
--
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