From a91c43c7313a995a8908f8f6b911a85d00fdbffd Mon Sep 17 00:00:00 2001 From: Joonsoo Kim Date: Thu, 19 May 2016 17:12:10 -0700 Subject: [PATCH] mm/vmstat: add zone range overlapping check There is a system thats node's pfns are overlapped as follows: -----pfn--------> N0 N1 N2 N0 N1 N2 Therefore, we need to care this overlapping when iterating pfn range. There are two places in vmstat.c that iterates pfn range and they don't consider this overlapping. Add it. Without this patch, above system could over count pageblock number on a zone. Signed-off-by: Joonsoo Kim Acked-by: Vlastimil Babka Cc: Rik van Riel Cc: Johannes Weiner Cc: Mel Gorman Cc: Laura Abbott Cc: Minchan Kim Cc: Marek Szyprowski Cc: Michal Nazarewicz Cc: "Aneesh Kumar K.V" Cc: "Rafael J. Wysocki" Cc: Benjamin Herrenschmidt Cc: Paul Mackerras Cc: Michael Ellerman Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/vmstat.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/vmstat.c b/mm/vmstat.c index 5e4300482897..0a726e398cfd 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -1010,6 +1010,9 @@ static void pagetypeinfo_showblockcount_print(struct seq_file *m, if (!memmap_valid_within(pfn, page, zone)) continue; + if (page_zone(page) != zone) + continue; + mtype = get_pageblock_migratetype(page); if (mtype < MIGRATE_TYPES) @@ -1076,6 +1079,10 @@ static void pagetypeinfo_showmixedcount_print(struct seq_file *m, continue; page = pfn_to_page(pfn); + + if (page_zone(page) != zone) + continue; + if (PageBuddy(page)) { pfn += (1UL << page_order(page)) - 1; continue; -- 2.39.2