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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 58F77C433F5 for ; Thu, 12 May 2022 16:36:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1356528AbiELQgd (ORCPT ); Thu, 12 May 2022 12:36:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:46494 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229695AbiELQf5 (ORCPT ); Thu, 12 May 2022 12:35:57 -0400 Received: from mail-wr1-x432.google.com (mail-wr1-x432.google.com [IPv6:2a00:1450:4864:20::432]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4242124BCD for ; Thu, 12 May 2022 09:35:54 -0700 (PDT) Received: by mail-wr1-x432.google.com with SMTP id d5so8040418wrb.6 for ; Thu, 12 May 2022 09:35:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=WI3cwKsmHof/OcrqvPRziZY0WNbcOSp0pjtWhKscn90=; b=ql4skT3syzulvYtB3mKtdEZYmL+0sBTcLlZkplV4e+tc73rQf/EFwdUuvtl976ZNKQ Qx9+5MRx4oZYAIeIXr/MvmILjPot4qN73EAR4RfMxYoNRhFXkqobqwNrpQwkGwVyOyWc e0pNGwBKkNOQLDyDBkHJWsT/xmyzAnCAY/sedn5zoEzhkHDVOCiMytzk0Soi2tdWLNoy dHWKXbxzsuE+h2zeN/jeMFM5EWcF+9RwNK3YWT1ZC99eZl9CIF+HwdTweUnSm48vuosI tEiN6tPk5evLbVMtkmOZMTTypc27oCdkAnHFf0PGmg8kbYE4yRIx2hD2SkhOM9IMT7Kf 5YEQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=WI3cwKsmHof/OcrqvPRziZY0WNbcOSp0pjtWhKscn90=; b=aLWBHxM1ONY67BvSLr8ux5mFy2gqza4JNz8KNAazr7CWYUO0zbYdDqDWox36IpGry3 VvZJUXnfy6clLye7XMAzds8ZkrDk3OEbQExDwp9EmkOnHyyZdkH6eAEEPeKBZ/s1akQj EB2PtpEOcjfD3TFaoqddfow+vdDuSxBFhlgdIQ7Q4wR65AnV1502cJyNIBoUPWy+p7em n88geXZSsYVGUEXTfGJowgyyRLFHzZh8kukour5ZypLO7hzOQdDgg7rYbhS1aWvrxI81 FI9N5iDUpfmhzjn2juCIUxhHW+bdhBqaTUb4ZLjc8JJ9T1h5jbFXxybNtmkMOfNksvNE ITDQ== X-Gm-Message-State: AOAM530tJxTewpFFM3kEYdwVAJUk23vp4Ryy6XotHSVR3u2NVawSGE8E CDyF+WHQNwmmdpUHPuuG4cr44g== X-Google-Smtp-Source: ABdhPJyO/iWs0LX48cRHJvndLLMM3GLztO2pjnzf7Kd816KCuJ25oK4UEqNfvXeqmVis0QtYeoQNsg== X-Received: by 2002:a5d:64cc:0:b0:20c:6339:3790 with SMTP id f12-20020a5d64cc000000b0020c63393790mr467141wri.378.1652373353490; Thu, 12 May 2022 09:35:53 -0700 (PDT) Received: from localhost.localdomain ([2a01:e0a:f:6020:253e:ae0a:544b:2cb1]) by smtp.gmail.com with ESMTPSA id j25-20020adfa799000000b0020c5253d8dbsm21814wrc.39.2022.05.12.09.35.51 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 May 2022 09:35:52 -0700 (PDT) From: Vincent Guittot To: mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, linux-kernel@vger.kernel.org, parth@linux.ibm.com Cc: qais.yousef@arm.com, chris.hyser@oracle.com, valentin.schneider@arm.com, patrick.bellasi@matbug.net, David.Laight@aculab.com, pjt@google.com, pavel@ucw.cz, tj@kernel.org, qperret@google.com, tim.c.chen@linux.intel.com, joshdon@google.com, Vincent Guittot Subject: [PATCH v2 2/7] sched/core: Propagate parent task's latency requirements to the child task Date: Thu, 12 May 2022 18:35:29 +0200 Message-Id: <20220512163534.2572-3-vincent.guittot@linaro.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20220512163534.2572-1-vincent.guittot@linaro.org> References: <20220512163534.2572-1-vincent.guittot@linaro.org> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Parth Shah Clone parent task's latency_nice attribute to the forked child task. Reset the latency_nice value to default value when the child task is set to sched_reset_on_fork. Also, initialize init_task.latency_nice value with DEFAULT_LATENCY_NICE value Signed-off-by: Parth Shah [rebase - minor fixes] Signed-off-by: Vincent Guittot --- init/init_task.c | 1 + kernel/sched/core.c | 4 ++++ 2 files changed, 5 insertions(+) diff --git a/init/init_task.c b/init/init_task.c index 73cc8f03511a..225d11a39bc9 100644 --- a/init/init_task.c +++ b/init/init_task.c @@ -78,6 +78,7 @@ struct task_struct init_task .prio = MAX_PRIO - 20, .static_prio = MAX_PRIO - 20, .normal_prio = MAX_PRIO - 20, + .latency_nice = DEFAULT_LATENCY_NICE, .policy = SCHED_NORMAL, .cpus_ptr = &init_task.cpus_mask, .user_cpus_ptr = NULL, diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 07bacb050198..1f04b815b588 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4473,6 +4473,9 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p) */ p->prio = current->normal_prio; + /* Propagate the parent's latency requirements to the child as well */ + p->latency_nice = current->latency_nice; + uclamp_fork(p); /* @@ -4489,6 +4492,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p) p->prio = p->normal_prio = p->static_prio; set_load_weight(p, false); + p->latency_nice = DEFAULT_LATENCY_NICE; /* * We don't need the reset flag anymore after the fork. It has * fulfilled its duty: -- 2.17.1