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Date: Fri, 21 Jan 2011 15:28:59 +0900
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To: Andi Kleen <tatsu@...jp.nec.com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Wu Fengguang <fengguang.wu@...el.com>,
Mel Gorman <mel@....ul.ie>,
Christoph Lameter <cl@...ux-foundation.org>,
Huang Ying <ying.huang@...el.com>,
Fernando Luis Vazquez Cao <fernando@....ntt.co.jp>,
tony.luck@...el.com, LKML <linux-kernel@...r.kernel.org>,
linux-mm <linux-mm@...ck.org>
Subject: [PATCH 6/7] HWPOISON: pass order to set/clear_page_hwpoison_huge_page()
When a surplus hugepage is soft-offlined, the old hugepage will
be freed into buddy directly. Then we'll have no access to hstate.
So we need to pass page order to PG_HWPoison set/clear functions.
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
---
mm/memory-failure.c | 21 ++++++++++++---------
1 files changed, 12 insertions(+), 9 deletions(-)
diff --git v2.6.38-rc1/mm/memory-failure.c v2.6.38-rc1/mm/memory-failure.c
index b4910e8..eed1846 100644
--- v2.6.38-rc1/mm/memory-failure.c
+++ v2.6.38-rc1/mm/memory-failure.c
@@ -927,18 +927,18 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
return ret;
}
-static void set_page_hwpoison_huge_page(struct page *hpage)
+static void set_page_hwpoison_huge_page(struct page *hpage, int order)
{
int i;
- int nr_pages = 1 << compound_trans_order(hpage);
+ int nr_pages = 1 << order;
for (i = 0; i < nr_pages; i++)
SetPageHWPoison(hpage + i);
}
-static void clear_page_hwpoison_huge_page(struct page *hpage)
+static void clear_page_hwpoison_huge_page(struct page *hpage, int order)
{
int i;
- int nr_pages = 1 << compound_trans_order(hpage);
+ int nr_pages = 1 << order;
for (i = 0; i < nr_pages; i++)
ClearPageHWPoison(hpage + i);
}
@@ -1002,7 +1002,8 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
atomic_long_sub(nr_pages, &mce_bad_pages);
return 0;
}
- set_page_hwpoison_huge_page(hpage);
+ set_page_hwpoison_huge_page(hpage,
+ compound_order(hpage));
res = dequeue_hwpoisoned_huge_page(hpage);
action_result(pfn, "free huge",
res ? IGNORED : DELAYED);
@@ -1078,7 +1079,7 @@ int __memory_failure(unsigned long pfn, int trapno, int flags)
* page lock held, we can safely set PG_hwpoison bits on tail pages.
*/
if (PageHuge(p))
- set_page_hwpoison_huge_page(hpage);
+ set_page_hwpoison_huge_page(hpage, compound_order(hpage));
wait_on_page_writeback(p);
@@ -1197,7 +1198,8 @@ int unpoison_memory(unsigned long pfn)
atomic_long_sub(nr_pages, &mce_bad_pages);
freeit = 1;
if (PageHuge(page))
- clear_page_hwpoison_huge_page(page);
+ clear_page_hwpoison_huge_page(page,
+ compound_order(page));
}
unlock_page(page);
@@ -1275,6 +1277,7 @@ static int soft_offline_huge_page(struct page *page, int flags)
int ret;
unsigned long pfn = page_to_pfn(page);
struct page *hpage = compound_head(page);
+ int order = compound_order(hpage);
LIST_HEAD(pagelist);
ret = get_any_page(page, pfn, flags);
@@ -1303,8 +1306,8 @@ static int soft_offline_huge_page(struct page *page, int flags)
}
done:
if (!PageHWPoison(hpage))
- atomic_long_add(1 << compound_trans_order(hpage), &mce_bad_pages);
- set_page_hwpoison_huge_page(hpage);
+ atomic_long_add(1 << order, &mce_bad_pages);
+ set_page_hwpoison_huge_page(hpage, order);
dequeue_hwpoisoned_huge_page(hpage);
/* keep elevated page count for bad page */
return ret;
--
1.7.3.4
--
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