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 DB4E4C38A24 for ; Thu, 7 May 2020 13:37:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BA45520643 for ; Thu, 7 May 2020 13:37:51 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726860AbgEGNhu (ORCPT ); Thu, 7 May 2020 09:37:50 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:15908 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbgEGNht (ORCPT ); Thu, 7 May 2020 09:37:49 -0400 Received: from pps.filterd (m0098410.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 047DXLcf089550; Thu, 7 May 2020 09:37:37 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 30ux6ex67m-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 09:37:37 -0400 Received: from m0098410.ppops.net (m0098410.ppops.net [127.0.0.1]) by pps.reinject (8.16.0.36/8.16.0.36) with SMTP id 047DXQQ5089814; Thu, 7 May 2020 09:37:36 -0400 Received: from ppma05fra.de.ibm.com (6c.4a.5195.ip4.static.sl-reverse.com [149.81.74.108]) by mx0a-001b2d01.pphosted.com with ESMTP id 30ux6ex65w-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 09:37:36 -0400 Received: from pps.filterd (ppma05fra.de.ibm.com [127.0.0.1]) by ppma05fra.de.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 047DV7Z3002197; Thu, 7 May 2020 13:37:34 GMT Received: from b06cxnps4075.portsmouth.uk.ibm.com (d06relay12.portsmouth.uk.ibm.com [9.149.109.197]) by ppma05fra.de.ibm.com with ESMTP id 30s0g5mmre-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 13:37:33 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps4075.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 047DbVmh64422016 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 7 May 2020 13:37:31 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9B2AEAE053; Thu, 7 May 2020 13:37:31 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9521AAE051; Thu, 7 May 2020 13:37:28 +0000 (GMT) Received: from localhost.in.ibm.com (unknown [9.85.97.135]) by d06av26.portsmouth.uk.ibm.com (Postfix) with ESMTP; Thu, 7 May 2020 13:37:28 +0000 (GMT) From: Parth Shah To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, qais.yousef@arm.com, chris.hyser@oracle.com, pkondeti@codeaurora.org, valentin.schneider@arm.com, rjw@rjwysocki.net Subject: [RFC 1/4] sched/core: Introduce per_cpu counter to track latency sensitive tasks Date: Thu, 7 May 2020 19:07:20 +0530 Message-Id: <20200507133723.18325-2-parth@linux.ibm.com> X-Mailer: git-send-email 2.17.2 In-Reply-To: <20200507133723.18325-1-parth@linux.ibm.com> References: <20200507133723.18325-1-parth@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216,18.0.676 definitions=2020-05-07_08:2020-05-07,2020-05-07 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 adultscore=0 mlxscore=0 bulkscore=0 mlxlogscore=999 malwarescore=0 spamscore=0 suspectscore=1 phishscore=0 priorityscore=1501 clxscore=1015 impostorscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2003020000 definitions=main-2005070111 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The "nr_lat_sensitive" per_cpu variable provides hints on the possible number of latency-sensitive tasks occupying the CPU. This hints further helps in inhibiting the CPUIDLE governor from calling deeper IDLE states (next patches includes this). Signed-off-by: Parth Shah --- kernel/sched/core.c | 2 ++ kernel/sched/sched.h | 2 ++ 2 files changed, 4 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2576fd8cacf9..2d8b76f41d61 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6606,6 +6606,7 @@ static struct kmem_cache *task_group_cache __read_mostly; DECLARE_PER_CPU(cpumask_var_t, load_balance_mask); DECLARE_PER_CPU(cpumask_var_t, select_idle_mask); +DEFINE_PER_CPU(int, nr_lat_sensitive); void __init sched_init(void) { @@ -6737,6 +6738,7 @@ void __init sched_init(void) #endif /* CONFIG_SMP */ hrtick_rq_init(rq); atomic_set(&rq->nr_iowait, 0); + per_cpu(nr_lat_sensitive, i) = 0; } set_load_weight(&init_task, false); diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index b2c86dfe913e..5c41020c530e 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1439,6 +1439,8 @@ DECLARE_PER_CPU(struct sched_domain_shared __rcu *, sd_llc_shared); DECLARE_PER_CPU(struct sched_domain __rcu *, sd_numa); DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_packing); DECLARE_PER_CPU(struct sched_domain __rcu *, sd_asym_cpucapacity); +DECLARE_PER_CPU(int, nr_lat_sensitive); + extern struct static_key_false sched_asym_cpucapacity; struct sched_group_capacity { -- 2.17.2