mm/zsmalloc.c: fix the migrated zspage statistics.

When zspage is migrated to the other zone, the zone page state should be updated as well, otherwise the NR_ZSPAGE for each zone shows wrong counts including proc/zoneinfo in practice. Link: http://lkml.kernel.org/r/[email protected] Fixes: 91537fe ("mm: add NR_ZSMALLOC to vmstat") Signed-off-by: Chanho Min <[email protected]> Signed-off-by: Jinsuk Choi <[email protected]> Reviewed-by: Sergey Senozhatsky <[email protected]> Acked-by: Minchan Kim <[email protected]> Cc: <[email protected]> [4.9+] Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
vieko · Jan 4, 2020 · ac8f05d · ac8f05d
1 parent feee6b2
commit ac8f05d
Showing 1 changed file with 5 additions and 0 deletions.
diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
@@ -2069,6 +2069,11 @@ static int zs_page_migrate(struct address_space *mapping, struct page *newpage,
 		zs_pool_dec_isolated(pool);
 	}
 
+	if (page_zone(newpage) != page_zone(page)) {
+		dec_zone_page_state(page, NR_ZSPAGES);
+		inc_zone_page_state(newpage, NR_ZSPAGES);
+	}
+
 	reset_page(page);
 	put_page(page);
 	page = newpage;