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 21C10C2D0BF for ; Sun, 8 Dec 2019 06:05:00 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F260C206F4 for ; Sun, 8 Dec 2019 06:04:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726511AbfLHGEf (ORCPT ); Sun, 8 Dec 2019 01:04:35 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:7882 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726475AbfLHGEe (ORCPT ); Sun, 8 Dec 2019 01:04:34 -0500 Received: from pps.filterd (m0187473.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id xB85xFug052229 for ; Sun, 8 Dec 2019 01:04:33 -0500 Received: from e06smtp07.uk.ibm.com (e06smtp07.uk.ibm.com [195.75.94.103]) by mx0a-001b2d01.pphosted.com with ESMTP id 2wr8kuybfh-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Sun, 08 Dec 2019 01:04:33 -0500 Received: from localhost by e06smtp07.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) Sun, 8 Dec 2019 06:04:27 -0000 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xB864Qim33292494 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 8 Dec 2019 06:04:26 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4E61A11C04C; Sun, 8 Dec 2019 06:04:26 +0000 (GMT) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 1E0DE11C04A; Sun, 8 Dec 2019 06:04:22 +0000 (GMT) Received: from localhost.localdomain.com (unknown [9.85.71.101]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Sun, 8 Dec 2019 06:04:21 +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, pjt@google.com, tj@kernel.org, dietmar.eggemann@arm.com Subject: [PATCH v2 2/3] sched/core: Propagate parent task's latency requirements to the child task Date: Sun, 8 Dec 2019 11:34:09 +0530 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20191208060410.17814-1-parth@linux.ibm.com> References: <20191208060410.17814-1-parth@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19120806-0028-0000-0000-000003C6747E X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19120806-0029-0000-0000-000024899D02 Message-Id: <20191208060410.17814-3-parth@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-08_01:2019-12-05,2019-12-08 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 mlxlogscore=954 lowpriorityscore=0 priorityscore=1501 impostorscore=0 malwarescore=0 phishscore=0 bulkscore=0 clxscore=1015 adultscore=0 spamscore=0 suspectscore=1 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912080054 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 Reviewed-by: Qais Yousef --- kernel/sched/core.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2da6a005bb3f..3f9359d0e326 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