From patchwork Mon Apr 29 17:13:31 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Shakeel Butt X-Patchwork-Id: 10922135 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3F35092A for ; Mon, 29 Apr 2019 17:13:53 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2556828843 for ; Mon, 29 Apr 2019 17:13:53 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1929A2884F; Mon, 29 Apr 2019 17:13:53 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-15.5 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI, USER_IN_DEF_DKIM_WL autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0BFE5285B0 for ; Mon, 29 Apr 2019 17:13:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728924AbfD2RNt (ORCPT ); Mon, 29 Apr 2019 13:13:49 -0400 Received: from mail-qt1-f201.google.com ([209.85.160.201]:52139 "EHLO mail-qt1-f201.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728748AbfD2RNt (ORCPT ); Mon, 29 Apr 2019 13:13:49 -0400 Received: by mail-qt1-f201.google.com with SMTP id i38so6704972qte.18 for ; Mon, 29 Apr 2019 10:13:48 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:message-id:mime-version:subject:from:to:cc; bh=eAfjg0nGPcLWfxJJhGXBjl7FIwajcYkmLSUZC9BoAVo=; b=FKmZgoHbVGCO97K3BcQ+ic4v++s8rwzSXFy75ckZdej+bpKpVXnUNuY3AXrL33BVgJ Hqz2qDXRzmxVtOoIbcV+h21LE3UduSmU2SvSZoF6iZ6fTU/Uda98vcUkpqI6iB9iB4m3 ts6v/RxvQwZAPpQgbA2bqqm1snmfVmcGk/alcHvia2mC0gY7WxDx3MzXcsdnuqA/gMZJ XBYlW9aAVRGre8B6TOocT9qUo0Kl2vE6THP1e5dwTEiMa3I9hqxw/zuSjkYo1tPPGfr0 F47SccgEZEd4YLwQlE/5seZLLVVmyOrAhtyFNqs1W697mP3Z5oznCNev6CK6HYxdQwla tG+g== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:message-id:mime-version:subject:from:to:cc; bh=eAfjg0nGPcLWfxJJhGXBjl7FIwajcYkmLSUZC9BoAVo=; b=I07y/HLCvE/DWr8SGlFw3NFFOXN34t5LEKhNdISLmgJLYKcIkXHIC28M4j0igvjqGV ra2kKYTEdEACfDA/CMHoIaaWmSEm0HIwNVnBUjDnuGfX0KRmj9aLBpo3trMo1FGkgm3s qOyR37btlyIhJOPDsGQCt1Hgn6rxjm8cIax21QjR9rppsZ+IieJgb0XqbaFOfj1HGmhs 2Hy4D0DqdTf/tyl0DCd70cISzNXJeKPYQHvPXCpTigHXixCxfh8PYGeq4qu4RjoIymdg VbXb83IYIAPaxgzaqdOEJbNQyDAhwgfbTqL022iojzvgNzgJoicRBJ1vsPSmLTa1XxNL 0pYg== X-Gm-Message-State: APjAAAUQqN3yFEJvMA7SdyzZSictHmjjHleu4MA/v/kOnRNjBsByRj0Y ZY5r0t+d7c+IvzHPXxsseVzlV6b1Hk9nFg== X-Google-Smtp-Source: APXvYqwwgWs3zy3FLOkSJFSV4QCkVGyC8pGPoFtNLJRMe+t9+l0sHrdTDJroLj5qqsGFZEw5ucWIBmehPElR7Q== X-Received: by 2002:a0c:c18d:: with SMTP id n13mr19796452qvh.109.1556558027954; Mon, 29 Apr 2019 10:13:47 -0700 (PDT) Date: Mon, 29 Apr 2019 10:13:31 -0700 Message-Id: <20190429171332.152992-1-shakeelb@google.com> Mime-Version: 1.0 X-Mailer: git-send-email 2.21.0.593.g511ec345e18-goog Subject: [PATCH 1/2] memcg, oom: no oom-kill for __GFP_RETRY_MAYFAIL From: Shakeel Butt To: Johannes Weiner , Vladimir Davydov , Michal Hocko , Andrew Morton , Roman Gushchin , Jan Kara , Amir Goldstein Cc: linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Shakeel Butt Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP The documentation of __GFP_RETRY_MAYFAIL clearly mentioned that the OOM killer will not be triggered and indeed the page alloc does not invoke OOM killer for such allocations. However we do trigger memcg OOM killer for __GFP_RETRY_MAYFAIL. Fix that. This flag will used later to not trigger oom-killer in the charging path for fanotify and inotify event allocations. Signed-off-by: Shakeel Butt Acked-by: Michal Hocko --- Changelog since v1: - commit message updated. mm/memcontrol.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 2713b45ec3f0..99eca724ed3b 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2294,7 +2294,6 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, unsigned long nr_reclaimed; bool may_swap = true; bool drained = false; - bool oomed = false; enum oom_status oom_status; if (mem_cgroup_is_root(memcg)) @@ -2381,7 +2380,7 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, if (nr_retries--) goto retry; - if (gfp_mask & __GFP_RETRY_MAYFAIL && oomed) + if (gfp_mask & __GFP_RETRY_MAYFAIL) goto nomem; if (gfp_mask & __GFP_NOFAIL) @@ -2400,7 +2399,6 @@ static int try_charge(struct mem_cgroup *memcg, gfp_t gfp_mask, switch (oom_status) { case OOM_SUCCESS: nr_retries = MEM_CGROUP_RECLAIM_RETRIES; - oomed = true; goto retry; case OOM_FAILED: goto force;