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 48B5AC38A2A for ; Thu, 7 May 2020 13:38:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 30A1D2073A for ; Thu, 7 May 2020 13:38:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726913AbgEGNiA (ORCPT ); Thu, 7 May 2020 09:38:00 -0400 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:25806 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725857AbgEGNh6 (ORCPT ); Thu, 7 May 2020 09:37:58 -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 047DXNDl089609; Thu, 7 May 2020 09:37:48 -0400 Received: from pps.reinject (localhost [127.0.0.1]) by mx0a-001b2d01.pphosted.com with ESMTP id 30ux6ex6gf-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 09:37:47 -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 047DY3Hx093587; Thu, 7 May 2020 09:37:47 -0400 Received: from ppma04ams.nl.ibm.com (63.31.33a9.ip4.static.sl-reverse.com [169.51.49.99]) by mx0a-001b2d01.pphosted.com with ESMTP id 30ux6ex6fb-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 09:37:47 -0400 Received: from pps.filterd (ppma04ams.nl.ibm.com [127.0.0.1]) by ppma04ams.nl.ibm.com (8.16.0.27/8.16.0.27) with SMTP id 047DUJpu009647; Thu, 7 May 2020 13:37:44 GMT Received: from b06cxnps3074.portsmouth.uk.ibm.com (d06relay09.portsmouth.uk.ibm.com [9.149.109.194]) by ppma04ams.nl.ibm.com with ESMTP id 30s0g5ue83-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 07 May 2020 13:37:44 +0000 Received: from d06av26.portsmouth.uk.ibm.com (d06av26.portsmouth.uk.ibm.com [9.149.105.62]) by b06cxnps3074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 047Dbg1M8978928 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 7 May 2020 13:37:42 GMT Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 14E68AE04D; Thu, 7 May 2020 13:37:42 +0000 (GMT) Received: from d06av26.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 580E3AE045; Thu, 7 May 2020 13:37:37 +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 13:37:37 +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 3/4] sched/idle: Disable idle call on least latency requirements Date: Thu, 7 May 2020 19:07:22 +0530 Message-Id: <20200507133723.18325-4-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=801 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 Restrict the call to deeper idle states when the given CPU has been set for the least latency requirements Signed-off-by: Parth Shah --- kernel/sched/idle.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/sched/idle.c b/kernel/sched/idle.c index b743bf38f08f..85d72a6e2521 100644 --- a/kernel/sched/idle.c +++ b/kernel/sched/idle.c @@ -262,7 +262,8 @@ static void do_idle(void) * broadcast device expired for us, we don't want to go deep * idle as we know that the IPI is going to arrive right away. */ - if (cpu_idle_force_poll || tick_check_broadcast_expired()) { + if (cpu_idle_force_poll || tick_check_broadcast_expired() || + per_cpu(nr_lat_sensitive, cpu)) { tick_nohz_idle_restart_tick(); cpu_idle_poll(); } else { -- 2.17.2