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Date: Fri, 3 Sep 2010 13:37:36 +0900
From: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
To: Andi Kleen <andi@...stfloor.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Christoph Lameter <cl@...ux-foundation.org>,
Mel Gorman <mel@....ul.ie>,
Wu Fengguang <fengguang.wu@...el.com>,
"Jun'ichi Nomura" <j-nomura@...jp.nec.com>,
linux-mm <linux-mm@...ck.org>,
LKML <linux-kernel@...r.kernel.org>
Subject: [PATCH 08/10] HWPOISON, hugetlb: soft offlining for hugepage
This patch extends soft offlining framework to support hugepage.
When memory corrected errors occur repeatedly on a hugepage,
we can choose to stop using it by migrating data onto another hugepage
and disabling the original (maybe half-broken) one.
ChangeLog since v3:
- remove comment about "ToDo: hugepage soft-offline"
ChangeLog since v2:
- move refcount handling into isolate_lru_page()
ChangeLog since v1:
- add double check in isolating hwpoisoned hugepage
- define free/non-free checker for hugepage
- postpone calling put_page() for hugepage in soft_offline_page()
Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com>
Signed-off-by: Jun'ichi Nomura <j-nomura@...jp.nec.com>
---
mm/memory-failure.c | 50 +++++++++++++++++++++++++++++++++-----------------
1 files changed, 33 insertions(+), 17 deletions(-)
diff --git v2.6.36-rc2/mm/memory-failure.c v2.6.36-rc2/mm/memory-failure.c
index dfeb8b8..80e71cd 100644
--- v2.6.36-rc2/mm/memory-failure.c
+++ v2.6.36-rc2/mm/memory-failure.c
@@ -693,8 +693,6 @@ static int me_swapcache_clean(struct page *p, unsigned long pfn)
* Issues:
* - Error on hugepage is contained in hugepage unit (not in raw page unit.)
* To narrow down kill region to one page, we need to break up pmd.
- * - To support soft-offlining for hugepage, we need to support hugepage
- * migration.
*/
static int me_huge_page(struct page *p, unsigned long pfn)
{
@@ -1220,7 +1218,11 @@ EXPORT_SYMBOL(unpoison_memory);
static struct page *new_page(struct page *p, unsigned long private, int **x)
{
int nid = page_to_nid(p);
- return alloc_pages_exact_node(nid, GFP_HIGHUSER_MOVABLE, 0);
+ if (PageHuge(p))
+ return alloc_huge_page_node(page_hstate(compound_head(p)),
+ nid);
+ else
+ return alloc_pages_exact_node(nid, GFP_HIGHUSER_MOVABLE, 0);
}
/*
@@ -1248,8 +1250,15 @@ static int get_any_page(struct page *p, unsigned long pfn, int flags)
* was free.
*/
set_migratetype_isolate(p);
+ /*
+ * When the target page is a free hugepage, just remove it
+ * from free hugepage list.
+ */
if (!get_page_unless_zero(compound_head(p))) {
- if (is_free_buddy_page(p)) {
+ if (PageHuge(p)) {
+ pr_debug("get_any_page: %#lx free huge page\n", pfn);
+ ret = dequeue_hwpoisoned_huge_page(compound_head(p));
+ } else if (is_free_buddy_page(p)) {
pr_debug("get_any_page: %#lx free buddy page\n", pfn);
/* Set hwpoison bit while page is still isolated */
SetPageHWPoison(p);
@@ -1294,6 +1303,7 @@ int soft_offline_page(struct page *page, int flags)
{
int ret;
unsigned long pfn = page_to_pfn(page);
+ struct page *hpage = compound_head(page);
ret = get_any_page(page, pfn, flags);
if (ret < 0)
@@ -1304,7 +1314,7 @@ int soft_offline_page(struct page *page, int flags)
/*
* Page cache page we can handle?
*/
- if (!PageLRU(page)) {
+ if (!PageLRU(page) && !PageHuge(page)) {
/*
* Try to free it.
*/
@@ -1320,21 +1330,21 @@ int soft_offline_page(struct page *page, int flags)
if (ret == 0)
goto done;
}
- if (!PageLRU(page)) {
+ if (!PageLRU(page) && !PageHuge(page)) {
pr_debug("soft_offline: %#lx: unknown non LRU page type %lx\n",
pfn, page->flags);
return -EIO;
}
- lock_page(page);
- wait_on_page_writeback(page);
+ lock_page(hpage);
+ wait_on_page_writeback(hpage);
/*
* Synchronized using the page lock with memory_failure()
*/
- if (PageHWPoison(page)) {
- unlock_page(page);
- put_page(page);
+ if (PageHWPoison(hpage)) {
+ unlock_page(hpage);
+ put_page(hpage);
pr_debug("soft offline: %#lx page already poisoned\n", pfn);
return -EBUSY;
}
@@ -1344,7 +1354,7 @@ int soft_offline_page(struct page *page, int flags)
* non dirty unmapped page cache pages.
*/
ret = invalidate_inode_page(page);
- unlock_page(page);
+ unlock_page(hpage);
/*
* Drop count because page migration doesn't like raised
@@ -1353,7 +1363,7 @@ int soft_offline_page(struct page *page, int flags)
* RED-PEN would be better to keep it isolated here, but we
* would need to fix isolation locking first.
*/
- put_page(page);
+ put_page(hpage);
if (ret == 1) {
ret = 0;
pr_debug("soft_offline: %#lx: invalidated\n", pfn);
@@ -1369,7 +1379,7 @@ int soft_offline_page(struct page *page, int flags)
if (!ret) {
LIST_HEAD(pagelist);
- list_add(&page->lru, &pagelist);
+ list_add(&hpage->lru, &pagelist);
ret = migrate_pages(&pagelist, new_page, MPOL_MF_MOVE_ALL, 0);
if (ret) {
pr_debug("soft offline: %#lx: migration failed %d, type %lx\n",
@@ -1385,9 +1395,15 @@ int soft_offline_page(struct page *page, int flags)
return ret;
done:
- atomic_long_add(1, &mce_bad_pages);
- SetPageHWPoison(page);
- /* keep elevated page count for bad page */
+ if (!PageHWPoison(hpage))
+ atomic_long_add(1 << compound_order(hpage), &mce_bad_pages);
+ if (PageHuge(hpage)) {
+ set_page_hwpoison_huge_page(hpage);
+ dequeue_hwpoisoned_huge_page(hpage);
+ } else {
+ SetPageHWPoison(page);
+ /* keep elevated page count for bad page */
+ }
return ret;
}
--
1.7.2.2
--
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