From: Chanho Min <chanho.min@xxxxxxx> 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@xxxxxxx Fixes: 91537fee0013 ("mm: add NR_ZSMALLOC to vmstat") Signed-off-by: Chanho Min <chanho.min@xxxxxxx> Signed-off-by: Jinsuk Choi <jjinsuk.choi@xxxxxxx> Reviewed-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Acked-by: Minchan Kim <minchan@xxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> [4.9+] Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/zsmalloc.c | 5 +++++ 1 file changed, 5 insertions(+) --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -2138,6 +2138,11 @@ 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;
