path: root/mm
diff options
authorDing Hui <>2021-06-04 20:01:21 -0700
committerLinus Torvalds <>2021-06-05 08:58:11 -0700
commitbac9c6fa1f929213bbd0ac9cdf21e8e2f0916828 (patch)
tree3be9566ae7396b13067950a0a41e16c9d587bb2d /mm
parent04f7ce3f07ce39b1a3ca03a56b238a53acc52cfd (diff)
mm/page_alloc: fix counting of free pages after take off from buddy
Recently we found that there is a lot MemFree left in /proc/meminfo after do a lot of pages soft offline, it's not quite correct. Before Oscar's rework of soft offline for free pages [1], if we soft offline free pages, these pages are left in buddy with HWPoison flag, and NR_FREE_PAGES is not updated immediately. So the difference between NR_FREE_PAGES and real number of available free pages is also even big at the beginning. However, with the workload running, when we catch HWPoison page in any alloc functions subsequently, we will remove it from buddy, meanwhile update the NR_FREE_PAGES and try again, so the NR_FREE_PAGES will get more and more closer to the real number of available free pages. (regardless of unpoison_memory()) Now, for offline free pages, after a successful call take_page_off_buddy(), the page is no longer belong to buddy allocator, and will not be used any more, but we missed accounting NR_FREE_PAGES in this situation, and there is no chance to be updated later. Do update in take_page_off_buddy() like rmqueue() does, but avoid double counting if some one already set_migratetype_isolate() on the page. [1]: commit 06be6ff3d2ec ("mm,hwpoison: rework soft offline for free pages") Link: Fixes: 06be6ff3d2ec ("mm,hwpoison: rework soft offline for free pages") Signed-off-by: Ding Hui <> Suggested-by: Naoya Horiguchi <> Reviewed-by: Oscar Salvador <> Acked-by: David Hildenbrand <> Acked-by: Naoya Horiguchi <> Cc: <> Signed-off-by: Andrew Morton <> Signed-off-by: Linus Torvalds <>
Diffstat (limited to 'mm')
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index aaa1655cf682..d1f5de1c1283 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -9158,6 +9158,8 @@ bool take_page_off_buddy(struct page *page)
del_page_from_free_list(page_head, zone, page_order);
break_down_buddy_pages(zone, page_head, page, 0,
page_order, migratetype);
+ if (!is_migrate_isolate(migratetype))
+ __mod_zone_freepage_state(zone, -1, migratetype);
ret = true;