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=-13.1 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT 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 CA1DCC433E0 for ; Thu, 13 Aug 2020 02:53:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A24022074D for ; Thu, 13 Aug 2020 02:53:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="rFgqBT3y" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726635AbgHMCxx (ORCPT ); Wed, 12 Aug 2020 22:53:53 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48628 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726284AbgHMCxw (ORCPT ); Wed, 12 Aug 2020 22:53:52 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 685BBC061383 for ; Wed, 12 Aug 2020 19:53:52 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id f9so2066783pju.4 for ; Wed, 12 Aug 2020 19:53:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id; bh=Qdg5ICKkw844+c4bO+aPNXZ+mzhilYRRfw1w5alQM80=; b=rFgqBT3yJy3T8ekWWpgECxbs8t0FsOBjYOEtaMb8DQJb07xdNq6ikvmpZGwiJwZ3Lc 7QZIeOXCJ4bMCIXwTY05d4DEMfxy6xSXUOhMGSNheCkpZXO/VNovXZaiKRfUkxNrkhBC qVgY/0HsfT9OmQ1aVGphDAL2tWoAIdWrVhLjJ59RarCpJKk7GBruwDzQbyX9ghu3MkLl 3mSyCxEVCcgTwJJw04pFK7de81DWfX8xSs7oQSp3Licm8CLBH+1D3o2UPxJR1kBCO1Z6 +oh5S2GoEqpd8Jx/yeZHEmCcoLTTd+5pa4vvofAOpuyTVhajRxj9XhX+j3C7ERWPFmna OCVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=Qdg5ICKkw844+c4bO+aPNXZ+mzhilYRRfw1w5alQM80=; b=aHjbqILriFLcYoQvtvFIhcC3ONFb5ntDh5DLrcv+NyLTruySi92a0fBRR2ujjs32p1 tWSWHjCK6kr1TFbgIjWcbCfqnWt9oKjsFyJjgjxB8DyEm2WHjP4TLnP/DnmbDwQ/azfw tiy+Let+7Ay8J0DfIA1PJp3yKw57AfZePKu385B/axTvZe9UCzxi/Ie9HRipw8YLj1m9 CtB6V3FopAQHIVfKsuHw/u+Uj2qawUmb7SRjQ+Yj3owuY0Y1c+HcSE/1loQJnsZOsRxH w6qG6LmA80Vonyc2Jz9QhOOtzdwuyJB0kPizhj5zL0Dr+vFRSdpnM2pBsTm/+R0KJ5Am RkjQ== X-Gm-Message-State: AOAM532WlvTeoGpnfpcl/q2Vjdu97LXDn3Ldzh6ZhUXzcR136s1IAe9X FPMcrCxq/88791k70EmfpUs= X-Google-Smtp-Source: ABdhPJxcD8qcWMtaj2hCnGFtA9hQAOoaqbq5mDPW2pcy1YTZxfVEUosBiMLQAsN9xouis9m3TnAl3A== X-Received: by 2002:a17:902:8eca:: with SMTP id x10mr2142058plo.129.1597287231989; Wed, 12 Aug 2020 19:53:51 -0700 (PDT) Received: from ubuntu.localdomain ([118.193.245.26]) by smtp.gmail.com with ESMTPSA id f195sm3614244pfa.96.2020.08.12.19.53.42 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Wed, 12 Aug 2020 19:53:51 -0700 (PDT) From: hui yang To: christian.brauner@ubuntu.com Cc: christian@brauner.io, peterz@infradead.org, christian@kellner.me, tglx@linutronix.de, linux-kernel@vger.kernel.org, wad@chromium.org, YangHui Subject: [PATCH v2] mm: LMK, adjust oom_score_adj when fork a new process Date: Thu, 13 Aug 2020 10:53:31 +0800 Message-Id: <1597287211-4291-1-git-send-email-yanghui.def@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: YangHui Also it rely on inheritance,But there are some things you need't inheriting if all children oom_score_adj is -1000,the oom is meaningless Signed-off-by: YangHui --- include/uapi/linux/oom.h | 1 + kernel/fork.c | 4 ++-- 2 files changed, 3 insertions(+), 2 deletions(-) diff --git a/include/uapi/linux/oom.h b/include/uapi/linux/oom.h index 750b1c5..0251f23 100644 --- a/include/uapi/linux/oom.h +++ b/include/uapi/linux/oom.h @@ -8,6 +8,7 @@ */ #define OOM_SCORE_ADJ_MIN (-1000) #define OOM_SCORE_ADJ_MAX 1000 +#define OOM_SCORE_ADJ_DEFAULT 0 /* * /proc//oom_adj set to -17 protects from the oom killer for legacy diff --git a/kernel/fork.c b/kernel/fork.c index 4d32190..9dfa388 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1584,8 +1584,8 @@ static int copy_signal(unsigned long clone_flags, struct task_struct *tsk) tty_audit_fork(sig); sched_autogroup_fork(sig); - sig->oom_score_adj = current->signal->oom_score_adj; - sig->oom_score_adj_min = current->signal->oom_score_adj_min; + sig->oom_score_adj = OOM_SCORE_ADJ_DEFAULT; + sig->oom_score_adj_min = OOM_SCORE_ADJ_MIN; mutex_init(&sig->cred_guard_mutex); mutex_init(&sig->exec_update_mutex); -- 2.7.4