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 346B5C33CB1 for ; Thu, 16 Jan 2020 12:02:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 14DF420663 for ; Thu, 16 Jan 2020 12:02:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726889AbgAPMCp (ORCPT ); Thu, 16 Jan 2020 07:02:45 -0500 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:56336 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726160AbgAPMCo (ORCPT ); Thu, 16 Jan 2020 07:02:44 -0500 Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 00GBvVMq117995 for ; Thu, 16 Jan 2020 07:02:43 -0500 Received: from e06smtp02.uk.ibm.com (e06smtp02.uk.ibm.com [195.75.94.98]) by mx0b-001b2d01.pphosted.com with ESMTP id 2xhgs7uk2c-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 16 Jan 2020 07:02:42 -0500 Received: from localhost by e06smtp02.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) Thu, 16 Jan 2020 12:02:36 -0000 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps3075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 00GC2ZHO61407420 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 16 Jan 2020 12:02:35 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CC9CAA4053; Thu, 16 Jan 2020 12:02:35 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 89C0EA405D; Thu, 16 Jan 2020 12:02:33 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.124.35.120]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 16 Jan 2020 12:02:33 +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 v3 1/3] sched: Introduce latency-nice as a per-task attribute Date: Thu, 16 Jan 2020 17:32:28 +0530 X-Mailer: git-send-email 2.17.2 In-Reply-To: <20200116120230.16759-1-parth@linux.ibm.com> References: <20200116120230.16759-1-parth@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 20011612-0008-0000-0000-00000349E23B X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 20011612-0009-0000-0000-00004A6A3BCC Message-Id: <20200116120230.16759-2-parth@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.138,18.0.572 definitions=2020-01-16_03:2020-01-16,2020-01-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxscore=0 malwarescore=0 suspectscore=1 mlxlogscore=999 impostorscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 clxscore=1015 priorityscore=1501 phishscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-2001160103 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Latency-nice indicates the latency requirements of a task with respect to the other tasks in the system. The value of the attribute can be within the range of [-20, 19] both inclusive to be in-line with the values just like task nice values. latency_nice = -20 indicates the task to have the least latency as compared to the tasks having latency_nice = +19. The latency_nice may affect only the CFS SCHED_CLASS by getting latency requirements from the userspace. Signed-off-by: Parth Shah Reviewed-by: Qais Yousef --- include/linux/sched.h | 1 + kernel/sched/sched.h | 18 ++++++++++++++++++ 2 files changed, 19 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 467d26046416..0668948fddcd 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -676,6 +676,7 @@ struct task_struct { int static_prio; int normal_prio; unsigned int rt_priority; + int latency_nice; const struct sched_class *sched_class; struct sched_entity se; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 1a88dc8ad11b..edae9277e48d 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -101,6 +101,24 @@ extern long calc_load_fold_active(struct rq *this_rq, long adjust); */ #define NS_TO_JIFFIES(TIME) ((unsigned long)(TIME) / (NSEC_PER_SEC / HZ)) +/* + * Latency nice is meant to provide scheduler hints about the relative + * latency requirements of a task with respect to other tasks. + * Thus a task with latency_nice == 19 can be hinted as the task with no + * latency requirements, in contrast to the task with latency_nice == -20 + * which should be given priority in terms of lower latency. + */ +#define MAX_LATENCY_NICE 19 +#define MIN_LATENCY_NICE -20 + +#define LATENCY_NICE_WIDTH \ + (MAX_LATENCY_NICE - MIN_LATENCY_NICE + 1) + +/* + * Default tasks should be treated as a task with latency_nice = 0. + */ +#define DEFAULT_LATENCY_NICE 0 + /* * Increase resolution of nice-level calculations for 64-bit architectures. * The extra resolution improves shares distribution and load balancing of -- 2.17.2