From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752901AbeEGURA (ORCPT ); Mon, 7 May 2018 16:17:00 -0400 Received: from mail-pl0-f65.google.com ([209.85.160.65]:36689 "EHLO mail-pl0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752081AbeEGUQ6 (ORCPT ); Mon, 7 May 2018 16:16:58 -0400 X-Google-Smtp-Source: AB8JxZrjeNtyydkZCKZJ0DGYxw2qebuHIwIatNBHR0r0GXnYhks7qqb/DG9uA+xvIvJmfJ6s9irOBg== From: Shakeel Butt To: Michal Hocko , Andrew Morton , Greg Thelen , Johannes Weiner , Vladimir Davydov Cc: Linux MM , Cgroups , LKML , Junaid Shahid , Junaid Shahid , Shakeel Butt Subject: [PATCH] mm: memcontrol: drain memcg stock on force_empty Date: Mon, 7 May 2018 13:16:51 -0700 Message-Id: <20180507201651.165879-1-shakeelb@google.com> X-Mailer: git-send-email 2.17.0.441.gb46fe60e1d-goog Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Junaid Shahid The per-cpu memcg stock can retain a charge of upto 32 pages. On a machine with large number of cpus, this can amount to a decent amount of memory. Additionally force_empty interface might be triggering unneeded memcg reclaims. Signed-off-by: Junaid Shahid Signed-off-by: Shakeel Butt --- mm/memcontrol.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index e2d33a37f971..2c3c69524b49 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2841,6 +2841,9 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg) /* we call try-to-free pages for make this cgroup empty */ lru_add_drain_all(); + + drain_all_stock(memcg); + /* try to free all pages in this cgroup */ while (nr_retries && page_counter_read(&memcg->memory)) { int progress; -- 2.17.0.441.gb46fe60e1d-goog