[PATCH 4.14 29/74] mm/zsmalloc.c: fix the migrated zspage statistics.

Greg Kroah-Hartman
2020-01-07T21:11:15Z

From: Chanho Min <chanho.min@lge.com>

commit ac8f05da5174c560de122c499ce5dfb5d0dfbee5 upstream.

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/1575434841-48009-1-git-send-email-chanho.min@lge.com
Fixes: 91537fee0013 ("mm: add NR_ZSMALLOC to vmstat")
Signed-off-by: Chanho Min <chanho.min@lge.com>
Signed-off-by: Jinsuk Choi <jjinsuk.choi@lge.com>
Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@gmail.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Cc: <stable@vger.kernel.org> [4.9+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
mm/zsmalloc.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/mm/zsmalloc.c
+++ b/mm/zsmalloc.c
@@ -2088,6 +2088,11 @@ int zs_page_migrate(struct address_space
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;