memory-hotplug: skip HWPoisoned page when offlining pages
hwpoisoned may be set when we offline a page by the sysfs interface
/sys/devices/system/memory/soft_offline_page or
/sys/devices/system/memory/hard_offline_page. If we don't clear
this flag when onlining pages, this page can't be freed, and will
not in free list. So we can't offline these pages again. So we
should skip such page when offlining pages.
Signed-off-by: Wen Congyang <wency@cn.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Jiang Liu <liuj97@gmail.com>
Cc: Len Brown <len.brown@intel.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/page_isolation.c b/mm/page_isolation.c
index f2f5b48..9d2264e 100644
--- a/mm/page_isolation.c
+++ b/mm/page_isolation.c
@@ -30,7 +30,7 @@
zone->nr_pageblock_isolate--;
}
-int set_migratetype_isolate(struct page *page)
+int set_migratetype_isolate(struct page *page, bool skip_hwpoisoned_pages)
{
struct zone *zone;
unsigned long flags, pfn;
@@ -66,7 +66,8 @@
* FIXME: Now, memory hotplug doesn't call shrink_slab() by itself.
* We just check MOVABLE pages.
*/
- if (!has_unmovable_pages(zone, page, arg.pages_found))
+ if (!has_unmovable_pages(zone, page, arg.pages_found,
+ skip_hwpoisoned_pages))
ret = 0;
/*
@@ -134,7 +135,7 @@
* Returns 0 on success and -EBUSY if any part of range cannot be isolated.
*/
int start_isolate_page_range(unsigned long start_pfn, unsigned long end_pfn,
- unsigned migratetype)
+ unsigned migratetype, bool skip_hwpoisoned_pages)
{
unsigned long pfn;
unsigned long undo_pfn;
@@ -147,7 +148,8 @@
pfn < end_pfn;
pfn += pageblock_nr_pages) {
page = __first_valid_page(pfn, pageblock_nr_pages);
- if (page && set_migratetype_isolate(page)) {
+ if (page &&
+ set_migratetype_isolate(page, skip_hwpoisoned_pages)) {
undo_pfn = pfn;
goto undo;
}
@@ -190,7 +192,8 @@
* Returns 1 if all pages in the range are isolated.
*/
static int
-__test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn)
+__test_page_isolated_in_pageblock(unsigned long pfn, unsigned long end_pfn,
+ bool skip_hwpoisoned_pages)
{
struct page *page;
@@ -220,6 +223,14 @@
else if (page_count(page) == 0 &&
get_freepage_migratetype(page) == MIGRATE_ISOLATE)
pfn += 1;
+ else if (skip_hwpoisoned_pages && PageHWPoison(page)) {
+ /*
+ * The HWPoisoned page may be not in buddy
+ * system, and page_count() is not 0.
+ */
+ pfn++;
+ continue;
+ }
else
break;
}
@@ -228,7 +239,8 @@
return 1;
}
-int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn)
+int test_pages_isolated(unsigned long start_pfn, unsigned long end_pfn,
+ bool skip_hwpoisoned_pages)
{
unsigned long pfn, flags;
struct page *page;
@@ -251,7 +263,8 @@
/* Check all pages are free or Marked as ISOLATED */
zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
- ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn);
+ ret = __test_page_isolated_in_pageblock(start_pfn, end_pfn,
+ skip_hwpoisoned_pages);
spin_unlock_irqrestore(&zone->lock, flags);
return ret ? 0 : -EBUSY;
}
