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=-9.8 required=3.0 tests=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 7A386C432C3 for ; Mon, 25 Nov 2019 09:47:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 52B1F2082C for ; Mon, 25 Nov 2019 09:47:15 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727423AbfKYJrO (ORCPT ); Mon, 25 Nov 2019 04:47:14 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:21898 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727133AbfKYJrO (ORCPT ); Mon, 25 Nov 2019 04:47:14 -0500 Received: from pps.filterd (m0098409.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xAP9lDxl086555 for ; Mon, 25 Nov 2019 04:47:13 -0500 Received: from e06smtp04.uk.ibm.com (e06smtp04.uk.ibm.com [195.75.94.100]) by mx0a-001b2d01.pphosted.com with ESMTP id 2wfjqxv424-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Mon, 25 Nov 2019 04:47:12 -0500 Received: from localhost by e06smtp04.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! 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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 25 Nov 2019 09:46:29 -0000 Received: from b06wcsmtp001.portsmouth.uk.ibm.com (b06wcsmtp001.portsmouth.uk.ibm.com [9.149.105.160]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xAP9kS2G55050384 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 25 Nov 2019 09:46:28 GMT Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 42DF6A4064; Mon, 25 Nov 2019 09:46:28 +0000 (GMT) Received: from b06wcsmtp001.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 6DA9EA405C; Mon, 25 Nov 2019 09:46:25 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.124.35.38]) by b06wcsmtp001.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 25 Nov 2019 09:46:25 +0000 (GMT) From: Parth Shah To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org, patrick.bellasi@matbug.net, valentin.schneider@arm.com, qais.yousef@arm.com, pavel@ucw.cz, dhaval.giani@oracle.com, qperret@qperret.net, David.Laight@ACULAB.COM, morten.rasmussen@arm.com, pjt@google.com, tj@kernel.org, dietmar.eggemann@arm.com, viresh.kumar@linaro.org, rafael.j.wysocki@intel.com, daniel.lezcano@linaro.org Subject: [RFC 2/3] Propagate parent task's latency requirements to the child task Date: Mon, 25 Nov 2019 15:16:17 +0530 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20191125094618.30298-1-parth@linux.ibm.com> References: <20191125094618.30298-1-parth@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19112509-0016-0000-0000-000002CBECD7 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19112509-0017-0000-0000-0000332DBF73 Message-Id: <20191125094618.30298-3-parth@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-11-25_02:2019-11-21,2019-11-25 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 suspectscore=1 bulkscore=0 priorityscore=1501 adultscore=0 lowpriorityscore=0 mlxscore=0 clxscore=1015 mlxlogscore=726 spamscore=0 phishscore=0 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1911250090 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clone parent task's latency_tolerance attribute to the forked child task. Reset the latency_tolerance value to default value when the child task is set to sched_reset_on_fork. Signed-off-by: Parth Shah --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7880f4f64d0e..ea7abbf5c1bb 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -2853,6 +2853,9 @@ 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_tolerance = current->latency_tolerance; + uclamp_fork(p); /* @@ -2869,6 +2872,7 @@ int sched_fork(unsigned long clone_flags, struct task_struct *p) p->prio = p->normal_prio = __normal_prio(p); set_load_weight(p, false); + p->latency_tolerance = DEFAULT_LATENCY_TOLERANCE; /* * We don't need the reset flag anymore after the fork. It has * fulfilled its duty: -- 2.17.2