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=-10.5 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,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 D68E2C0044C for ; Mon, 5 Nov 2018 20:18:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 968F82081C for ; Mon, 5 Nov 2018 20:18:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="S3/JP+D2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 968F82081C Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=oracle.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730348AbeKFFkF (ORCPT ); Tue, 6 Nov 2018 00:40:05 -0500 Received: from userp2120.oracle.com ([156.151.31.85]:40094 "EHLO userp2120.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725910AbeKFFjC (ORCPT ); Tue, 6 Nov 2018 00:39:02 -0500 Received: from pps.filterd (userp2120.oracle.com [127.0.0.1]) by userp2120.oracle.com (8.16.0.22/8.16.0.22) with SMTP id wA5KEHfX036164; Mon, 5 Nov 2018 20:17:15 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=05nnPqw9uRoa9S7czKsl8/9xr5NCLycbSz2FN1K01/U=; b=S3/JP+D2RGvPo/tKPcDHI2NzGLKhOs5vxBf+QSBjabmqs6o08kxHIrarx0iu4XmR2MOy pnDvMNPT/Dzy88+fOyAO8d7mFsxI+jBRtvo9tlO2prr/v92NmWPJr1EBJybGm5sFHOVn MoA847N7g4Y0gFEa2LF0p/huTBN7jrGFjIXQWxOisLhflPLkyvIxCfIyVw+WFQ97VweH meiUWCIZciEl73gSI8qOppeiolio/nQNOpr2TQ7f/oaNgdAM8BPpn1Kx613k9hnnDJ7z FDsJRUb+rwaje9zzwb7yWV8w+GUK4mi91xR/e13wCk3NNJN6vcM8NjLjdVddW46oJolX Ag== Received: from userv0022.oracle.com (userv0022.oracle.com [156.151.31.74]) by userp2120.oracle.com with ESMTP id 2nh4aqh7dh-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 05 Nov 2018 20:17:15 +0000 Received: from aserv0122.oracle.com (aserv0122.oracle.com [141.146.126.236]) by userv0022.oracle.com (8.14.4/8.14.4) with ESMTP id wA5KHEfj011824 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 5 Nov 2018 20:17:14 GMT Received: from abhmp0004.oracle.com (abhmp0004.oracle.com [141.146.116.10]) by aserv0122.oracle.com (8.14.4/8.14.4) with ESMTP id wA5KHEsS032060; Mon, 5 Nov 2018 20:17:14 GMT Received: from ca-dev63.us.oracle.com (/10.211.8.221) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 05 Nov 2018 12:17:14 -0800 From: Steve Sistare To: mingo@redhat.com, peterz@infradead.org Cc: subhra.mazumdar@oracle.com, dhaval.giani@oracle.com, daniel.m.jordan@oracle.com, pavel.tatashin@microsoft.com, matt@codeblueprint.co.uk, umgwanakikbuti@gmail.com, riel@redhat.com, jbacik@fb.com, juri.lelli@redhat.com, valentin.schneider@arm.com, vincent.guittot@linaro.org, quentin.perret@arm.com, steven.sistare@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH v2 03/10] sched/topology: Provide cfs_overload_cpus bitmap Date: Mon, 5 Nov 2018 12:08:02 -0800 Message-Id: <1541448489-19692-4-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1541448489-19692-1-git-send-email-steven.sistare@oracle.com> References: <1541448489-19692-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9068 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=2 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1811050180 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Steve Sistare Define and initialize a sparse bitmap of overloaded CPUs, per last-level-cache scheduling domain, for use by the CFS scheduling class. Save a pointer to cfs_overload_cpus in the rq for efficient access. Signed-off-by: Steve Sistare --- include/linux/sched/topology.h | 1 + kernel/sched/sched.h | 2 ++ kernel/sched/topology.c | 21 +++++++++++++++++++-- 3 files changed, 22 insertions(+), 2 deletions(-) diff --git a/include/linux/sched/topology.h b/include/linux/sched/topology.h index 2634774..8bac15d 100644 --- a/include/linux/sched/topology.h +++ b/include/linux/sched/topology.h @@ -72,6 +72,7 @@ struct sched_domain_shared { atomic_t ref; atomic_t nr_busy_cpus; int has_idle_cores; + struct sparsemask *cfs_overload_cpus; }; struct sched_domain { diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index 455fa33..aadfe68 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -81,6 +81,7 @@ struct rq; struct cpuidle_state; +struct sparsemask; /* task_struct::on_rq states: */ #define TASK_ON_RQ_QUEUED 1 @@ -805,6 +806,7 @@ struct rq { struct cfs_rq cfs; struct rt_rq rt; struct dl_rq dl; + struct sparsemask *cfs_overload_cpus; #ifdef CONFIG_FAIR_GROUP_SCHED /* list of leaf cfs_rq on this CPU: */ diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c index a2363f6..f18c416 100644 --- a/kernel/sched/topology.c +++ b/kernel/sched/topology.c @@ -3,6 +3,7 @@ * Scheduler topology setup/handling methods */ #include "sched.h" +#include DEFINE_MUTEX(sched_domains_mutex); @@ -440,6 +441,7 @@ static void update_top_cache_domain(int cpu) static void cpu_attach_domain(struct sched_domain *sd, struct root_domain *rd, int cpu) { + struct sparsemask *cfs_overload_cpus; struct rq *rq = cpu_rq(cpu); struct sched_domain *tmp; @@ -481,6 +483,10 @@ static void update_top_cache_domain(int cpu) dirty_sched_domain_sysctl(cpu); destroy_sched_domains(tmp); + sd = highest_flag_domain(cpu, SD_SHARE_PKG_RESOURCES); + cfs_overload_cpus = (sd ? sd->shared->cfs_overload_cpus : NULL); + rcu_assign_pointer(rq->cfs_overload_cpus, cfs_overload_cpus); + update_top_cache_domain(cpu); } @@ -1611,9 +1617,19 @@ static void __sdt_free(const struct cpumask *cpu_map) } } +#define ZALLOC_MASK(maskp, nelems, node) \ + (!*(maskp) && !zalloc_sparsemask_node(maskp, nelems, \ + SPARSEMASK_DENSITY_DEFAULT, \ + GFP_KERNEL, node)) \ + static int sd_llc_alloc(struct sched_domain *sd) { - /* Allocate sd->shared data here. Empty for now. */ + struct sched_domain_shared *sds = sd->shared; + struct cpumask *span = sched_domain_span(sd); + int nid = cpu_to_node(cpumask_first(span)); + + if (ZALLOC_MASK(&sds->cfs_overload_cpus, nr_cpu_ids, nid)) + return 1; return 0; } @@ -1625,7 +1641,8 @@ static void sd_llc_free(struct sched_domain *sd) if (!sds) return; - /* Free data here. Empty for now. */ + free_sparsemask(sds->cfs_overload_cpus); + sds->cfs_overload_cpus = NULL; } static int sd_llc_alloc_all(const struct cpumask *cpu_map, struct s_data *d) -- 1.8.3.1