From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2F52BC4338F for ; Mon, 2 Aug 2021 14:38:58 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id C4C3660F58 for ; Mon, 2 Aug 2021 14:38:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org C4C3660F58 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvack.org Received: by kanga.kvack.org (Postfix) id 26C456B0033; Mon, 2 Aug 2021 10:38:57 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 21CA56B0036; Mon, 2 Aug 2021 10:38:57 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 0E4E86B005D; Mon, 2 Aug 2021 10:38:57 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0120.hostedemail.com [216.40.44.120]) by kanga.kvack.org (Postfix) with ESMTP id E42F56B0033 for ; Mon, 2 Aug 2021 10:38:56 -0400 (EDT) Received: from smtpin25.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay03.hostedemail.com (Postfix) with ESMTP id 97E198249980 for ; Mon, 2 Aug 2021 14:38:56 +0000 (UTC) X-FDA: 78430397472.25.41672DC Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [216.205.24.124]) by imf21.hostedemail.com (Postfix) with ESMTP id EA731D009375 for ; Mon, 2 Aug 2021 14:38:55 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1627915135; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=NvQqjHxDjWIl9I04pyF+RZqtMWv/K6HRiVTburrWufE=; b=WUGqEeuCo7SYyQ0j/kJrrvtU6UpIJhl9y7A1zagtSQcJvrHHY86cCKYWk61Opu53pzIcvG UumAPU6yOWwxvSP4yRbdPtXG+aK4f87Xi4tg9NcgP6gVBSklrr5YUjAOmcrM0IkfUch4lj gIe54RZq811uAk3Xf4Nll3jLrcaPuxs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-353-SRPPV-nUOr-33tcaUuMzHw-1; Mon, 02 Aug 2021 10:38:54 -0400 X-MC-Unique: SRPPV-nUOr-33tcaUuMzHw-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 67F84801B3C; Mon, 2 Aug 2021 14:38:50 +0000 (UTC) Received: from llong.com (unknown [10.22.18.93]) by smtp.corp.redhat.com (Postfix) with ESMTP id A469C10493BD; Mon, 2 Aug 2021 14:38:43 +0000 (UTC) From: Waiman Long To: Johannes Weiner , Michal Hocko , Vladimir Davydov , Andrew Morton , Tejun Heo , Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Vlastimil Babka , Roman Gushchin Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, Shakeel Butt , Muchun Song , Alex Shi , Chris Down , Yafang Shao , Wei Yang , Masayoshi Mizuma , Xing Zhengjun , Matthew Wilcox , Waiman Long Subject: [PATCH v2] mm/memcg: Fix incorrect flushing of lruvec data in obj_stock Date: Mon, 2 Aug 2021 10:38:34 -0400 Message-Id: <20210802143834.30578-1-longman@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: EA731D009375 Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=WUGqEeuC; dmarc=pass (policy=none) header.from=redhat.com; spf=none (imf21.hostedemail.com: domain of longman@redhat.com has no SPF policy when checking 216.205.24.124) smtp.mailfrom=longman@redhat.com X-Stat-Signature: puf9j1yt75qnhj3md1g8wo8rmmtbjiks X-HE-Tag: 1627915135-216365 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: When mod_objcg_state() is called with a pgdat that is different from that in the obj_stock, the old lruvec data cached in obj_stock are flushed out. Unfortunately, they were flushed to the new pgdat and so the data go to the wrong node. This will screw up the slab data reported in /sys/devices/system/node/node*/meminfo. Fix that by flushing the data to the cached pgdat instead. Fixes: 68ac5b3c8db2 ("mm/memcg: cache vmstat data in percpu memcg_stock_pcp") Signed-off-by: Waiman Long Acked-by: Michal Hocko --- mm/memcontrol.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index ae1f5d0cb581..87c883227f90 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -3106,13 +3106,15 @@ void mod_objcg_state(struct obj_cgroup *objcg, struct pglist_data *pgdat, stock->cached_pgdat = pgdat; } else if (stock->cached_pgdat != pgdat) { /* Flush the existing cached vmstat data */ + struct pglist_data *oldpg = stock->cached_pgdat; + if (stock->nr_slab_reclaimable_b) { - mod_objcg_mlstate(objcg, pgdat, NR_SLAB_RECLAIMABLE_B, + mod_objcg_mlstate(objcg, oldpg, NR_SLAB_RECLAIMABLE_B, stock->nr_slab_reclaimable_b); stock->nr_slab_reclaimable_b = 0; } if (stock->nr_slab_unreclaimable_b) { - mod_objcg_mlstate(objcg, pgdat, NR_SLAB_UNRECLAIMABLE_B, + mod_objcg_mlstate(objcg, oldpg, NR_SLAB_UNRECLAIMABLE_B, stock->nr_slab_unreclaimable_b); stock->nr_slab_unreclaimable_b = 0; } -- 2.18.1