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=-9.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH,UNPARSEABLE_RELAY, 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 3EFCBC468BD for ; Sun, 9 Jun 2019 01:55:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 1152B216F4 for ; Sun, 9 Jun 2019 01:55:27 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="Ah0T2vhG" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728213AbfFIBz0 (ORCPT ); Sat, 8 Jun 2019 21:55:26 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:46522 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728088AbfFIBzW (ORCPT ); Sat, 8 Jun 2019 21:55:22 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x591sPBO022907; Sun, 9 Jun 2019 01:54:45 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=corp-2018-07-02; bh=a9xr0ftUygGbe17n4LV66UNhDktetQVNmeRiOg3colM=; b=Ah0T2vhGXa9zgTbrmAjvdtjnBZ83Zh7/mlYE2UipD1SBZwHTBSbG5qyW5+/A40Pjsyge +IrtEVq8gFp8AsHjd6UiyUFDcJO+QyByXcv2HQDZh2Cp0z6AH+r6EQIzXI65/e0oK2ci iLu17e9RTZtr7oa28VAHTloyXVIi5XHjPixDeauI3MCafYV1XY4LxsU6SVsJfcEwkf5j jvYG7fv/5uQiAedN9MqIicNV3G5Xixh+YJbyUVGTWZJ1PF3y1jNCJ3soqptGhukknQEa qe4xrFmvEXbmVTZ1PP9AU9QEJemZrnQofJKD3xzEAxBTuEysdSE5GVl+64i3s+F9237x sg== Received: from userp3030.oracle.com (userp3030.oracle.com [156.151.31.80]) by userp2130.oracle.com with ESMTP id 2t04eta46u-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 09 Jun 2019 01:54:45 +0000 Received: from pps.filterd (userp3030.oracle.com [127.0.0.1]) by userp3030.oracle.com (8.16.0.27/8.16.0.27) with SMTP id x591rSVS026593; Sun, 9 Jun 2019 01:54:44 GMT Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userp3030.oracle.com with ESMTP id 2t024tcfmn-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Sun, 09 Jun 2019 01:54:44 +0000 Received: from abhmp0020.oracle.com (abhmp0020.oracle.com [141.146.116.26]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id x591sdLl009408; Sun, 9 Jun 2019 01:54:40 GMT Received: from smazumda-Precision-T1600.us.oracle.com (/10.132.91.175) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Sat, 08 Jun 2019 18:54:39 -0700 From: subhra mazumdar To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@redhat.com, steven.sistare@oracle.com, dhaval.giani@oracle.com, daniel.lezcano@linaro.org, vincent.guittot@linaro.org, viresh.kumar@linaro.org, tim.c.chen@linux.intel.com, mgorman@techsingularity.net Subject: [PATCH v3 2/7] sched: introduce per-cpu var next_cpu to track search limit Date: Sat, 8 Jun 2019 18:49:49 -0700 Message-Id: <20190609014954.1033-3-subhra.mazumdar@oracle.com> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20190609014954.1033-1-subhra.mazumdar@oracle.com> References: <20190609014954.1033-1-subhra.mazumdar@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9282 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=1 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1810050000 definitions=main-1906090012 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9282 signatures=668687 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 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=8.0.1-1810050000 definitions=main-1906090013 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introduce a per-cpu variable to track the limit upto which idle cpu search was done in select_idle_cpu(). This will help to start the search next time from there. This is necessary for rotating the search window over entire LLC domain. Signed-off-by: subhra mazumdar --- kernel/sched/core.c | 2 ++ kernel/sched/sched.h | 1 + 2 files changed, 3 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 874c427..80657fc 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -24,6 +24,7 @@ #include DEFINE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); +DEFINE_PER_CPU_SHARED_ALIGNED(int, next_cpu); #if defined(CONFIG_SCHED_DEBUG) && defined(CONFIG_JUMP_LABEL) /* @@ -5966,6 +5967,7 @@ void __init sched_init(void) for_each_possible_cpu(i) { struct rq *rq; + per_cpu(next_cpu, i) = -1; rq = cpu_rq(i); raw_spin_lock_init(&rq->lock); rq->nr_running = 0; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index b52ed1a..4cecfa2 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -994,6 +994,7 @@ static inline void update_idle_core(struct rq *rq) { } #endif DECLARE_PER_CPU_SHARED_ALIGNED(struct rq, runqueues); +DECLARE_PER_CPU_SHARED_ALIGNED(int, next_cpu); #define cpu_rq(cpu) (&per_cpu(runqueues, (cpu))) #define this_rq() this_cpu_ptr(&runqueues) -- 2.9.3