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 78196C76194 for ; Thu, 25 Jul 2019 07:09:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5AA1520840 for ; Thu, 25 Jul 2019 07:09:24 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729638AbfGYHJV (ORCPT ); Thu, 25 Jul 2019 03:09:21 -0400 Received: from mx0b-001b2d01.pphosted.com ([148.163.158.5]:23984 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729625AbfGYHJU (ORCPT ); Thu, 25 Jul 2019 03:09:20 -0400 Received: from pps.filterd (m0098417.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.27/8.16.0.27) with SMTP id x6P76XM3039778 for ; Thu, 25 Jul 2019 03:09:19 -0400 Received: from e06smtp01.uk.ibm.com (e06smtp01.uk.ibm.com [195.75.94.97]) by mx0a-001b2d01.pphosted.com with ESMTP id 2ty6ura3vd-1 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=NOT) for ; Thu, 25 Jul 2019 03:09:19 -0400 Received: from localhost by e06smtp01.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, 25 Jul 2019 08:09:13 +0100 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06avi18626390.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id x6P78vq335193172 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 25 Jul 2019 07:08:57 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 864B44C050; Thu, 25 Jul 2019 07:09:12 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 12FCE4C040; Thu, 25 Jul 2019 07:09:11 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.124.35.169]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 25 Jul 2019 07:09:10 +0000 (GMT) From: Parth Shah To: peterz@infradead.org, mingo@redhat.com Cc: linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org, patrick.bellasi@arm.com, dietmar.eggemann@arm.com, daniel.lezcano@linaro.org, subhra.mazumdar@oracle.com Subject: [RFC v4 7/8] sched/fair: Bound non idle core search within LLC domain Date: Thu, 25 Jul 2019 12:38:56 +0530 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20190725070857.6639-1-parth@linux.ibm.com> References: <20190725070857.6639-1-parth@linux.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 19072507-4275-0000-0000-000003505E59 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19072507-4276-0000-0000-0000386088A8 Message-Id: <20190725070857.6639-8-parth@linux.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2019-07-25_03:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1906280000 definitions=main-1907250085 Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org Specify the method which returns sched domain to limit the search for a non idle core. By default, limit the search in LLC domain which usually includes all the cores across the system. The select_non_idle_core searches for the non idle cores across whole system. But in the systems with multiple NUMA domains, the Turbo frequency can be sustained within the NUMA domain without being affected from other NUMA. For such case, arch_turbo_domain can be tuned to change domain for non idle core search. Signed-off-by: Parth Shah --- kernel/sched/fair.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 3ba2dc44cba4..e09e7546abeb 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6002,6 +6002,13 @@ static inline bool core_underutilized(unsigned long core_util, return core_util < (core_capacity >> UNDERUTILIZED_THRESHOLD); } +#ifndef arch_turbo_domain +static __always_inline struct cpumask *arch_turbo_domain(int cpu) +{ + return sched_domain_span(rcu_dereference(per_cpu(sd_llc, cpu))); +} +#endif + /* * Try to find a non idle core in the system with spare capacity * available for task packing, thereby keeping minimal cores active. @@ -6012,7 +6019,8 @@ static int select_non_idle_core(struct task_struct *p, int prev_cpu, int target) struct cpumask *cpus = this_cpu_cpumask_var_ptr(turbo_sched_mask); int iter_cpu, sibling; - cpumask_and(cpus, cpu_online_mask, p->cpus_ptr); + cpumask_and(cpus, cpu_online_mask, arch_turbo_domain(prev_cpu)); + cpumask_and(cpus, cpus, p->cpus_ptr); for_each_cpu_wrap(iter_cpu, cpus, prev_cpu) { unsigned long core_util = 0; -- 2.17.1