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[2620:137:e000::1:20]) by mx.google.com with ESMTP id o7-20020a656a47000000b004fba03ee686si10724195pgu.202.2023.03.06.07.31.54; Mon, 06 Mar 2023 07:32:07 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=mLHD0T3u; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229835AbjCFOny (ORCPT + 99 others); Mon, 6 Mar 2023 09:43:54 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42878 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230135AbjCFOnw (ORCPT ); Mon, 6 Mar 2023 09:43:52 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B6FB0233D5 for ; Mon, 6 Mar 2023 06:43:19 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Type:MIME-Version:References: Subject:Cc:To:From:Date:Message-ID:Sender:Reply-To:Content-Transfer-Encoding: Content-ID:Content-Description:In-Reply-To; bh=9t25UyY8GsyWpyj/eeeTlIlu/SI7oOBQaOdBT8jlk2E=; b=mLHD0T3uw08quqSPuOSfIa/Eis cLX+zIruVrcLAtPCpU4ucMQCicOyoxoB43+Zl8DnpSztzrurL26L2gQf00z+2oAeDofyFWPYLP1Hv FST5d1HrmZPuh2YXco40pK6AG+mOwN39M95WFah0HxXS+tVxX00WSM+5HXcweJIj9suJGnzr5bPCL 20nswJtcmtpdLueRNWH8l6iRW4l/iV7DNrGtAky8AoD77NZJDgb1bLTGYt5N8X7WGFIVa+4ry2U9q vwDnVu/YKe0EhbwGozHeAo/FcMNy5fpnPIiAcB0KoybCL2dY8PZ45va8TVSmyfcC4QZscC3wDk7h2 e5RbAqNw==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pZBe5-005P2O-JN; Mon, 06 Mar 2023 14:16:58 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 11DF23007FB; Mon, 6 Mar 2023 15:16:55 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 0) id EBEA323BC8E2D; Mon, 6 Mar 2023 15:16:54 +0100 (CET) Message-ID: <20230306141502.329973596@infradead.org> User-Agent: quilt/0.66 Date: Mon, 06 Mar 2023 14:25:23 +0100 From: Peter Zijlstra To: mingo@kernel.org, vincent.guittot@linaro.org Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, juri.lelli@redhat.com, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, corbet@lwn.net, qyousef@layalina.io, chris.hyser@oracle.com, patrick.bellasi@matbug.net, pjt@google.com, pavel@ucw.cz, qperret@google.com, tim.c.chen@linux.intel.com, joshdon@google.com, timj@gnu.org, kprateek.nayak@amd.com, yu.c.chen@intel.com, youssefesmat@chromium.org, joel@joelfernandes.org, Parth Shah Subject: [PATCH 02/10] sched/core: Propagate parent tasks latency requirements to the child task References: <20230306132521.968182689@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1759632925778033403?= X-GMAIL-MSGID: =?utf-8?q?1759632925778033403?= 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 [rebase] Signed-off-by: Parth Shah Signed-off-by: Vincent Guittot Signed-off-by: Peter Zijlstra (Intel) Tested-by: K Prateek Nayak Link: https://lkml.kernel.org/r/20230224093454.956298-4-vincent.guittot@linaro.org --- init/init_task.c | 1 + kernel/sched/core.c | 1 + 2 files changed, 2 insertions(+) Index: linux-2.6/init/init_task.c =================================================================== --- linux-2.6.orig/init/init_task.c +++ linux-2.6/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, Index: linux-2.6/kernel/sched/core.c =================================================================== --- linux-2.6.orig/kernel/sched/core.c +++ linux-2.6/kernel/sched/core.c @@ -4684,6 +4684,7 @@ int sched_fork(unsigned long clone_flags 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: