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=-9.3 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 5A4E2C7112C for ; Mon, 22 Oct 2018 15:10:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 314B420645 for ; Mon, 22 Oct 2018 15:10:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=oracle.com header.i=@oracle.com header.b="Vu2wPnFC" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 314B420645 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 S1728612AbeJVX26 (ORCPT ); Mon, 22 Oct 2018 19:28:58 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:58610 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728276AbeJVX2k (ORCPT ); Mon, 22 Oct 2018 19:28:40 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.22/8.16.0.22) with SMTP id w9MF4AVw151043; Mon, 22 Oct 2018 15:09:11 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=8aG2CK9mXYWFr3ZwbNx6SB9bSbnR+nXNgTTu4mWj3Us=; b=Vu2wPnFCpxwijynfsDqkdYP0HB+Sp2ZlXTtXWmf4o0frbEP9tykdMcYB5ix7c72qislq blEOq83Wq/5nZkexsIJXc8WuGq0N3cyvL/SS0Nj1G0nwKDoXgoQ7vwnDoXLgeHNWIiwf Z70i3ruYhlZVh+Ljs9wO8WdJzWuTQaQLLBbGTcgGFMOoo0Qtap/XmtHF4Y61wXg3VgXa zC6Gma0OqP0Bbjdghsy/zK948/hSBwiCc02wpW/i8vM2tSVO0flK1bMuz4paZSXQawMS E/uEFzCyAbj+iKUaWFG4FgGzSoUxzEe39YWWDLBmq1S/n8p632kOsYVkyRz3nltWZxIY 1Q== Received: from aserv0021.oracle.com (aserv0021.oracle.com [141.146.126.233]) by userp2130.oracle.com with ESMTP id 2n7usty8g6-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Oct 2018 15:09:11 +0000 Received: from aserv0121.oracle.com (aserv0121.oracle.com [141.146.126.235]) by aserv0021.oracle.com (8.14.4/8.14.4) with ESMTP id w9MF9AFT005136 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 22 Oct 2018 15:09:10 GMT Received: from abhmp0018.oracle.com (abhmp0018.oracle.com [141.146.116.24]) by aserv0121.oracle.com (8.14.4/8.13.8) with ESMTP id w9MF9AG0008366; Mon, 22 Oct 2018 15:09:10 GMT Received: from ca-dev63.us.oracle.com (/10.211.8.221) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Mon, 22 Oct 2018 08:09:10 -0700 From: Steve Sistare To: mingo@redhat.com, peterz@infradead.org Cc: subhra.mazumdar@oracle.com, dhaval.giani@oracle.com, rohit.k.jain@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, steven.sistare@oracle.com, linux-kernel@vger.kernel.org Subject: [PATCH 07/10] sched/fair: Provide can_migrate_task_llc Date: Mon, 22 Oct 2018 07:59:38 -0700 Message-Id: <1540220381-424433-8-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1540220381-424433-1-git-send-email-steven.sistare@oracle.com> References: <1540220381-424433-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=nai engine=5900 definitions=9053 signatures=668683 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 suspectscore=0 malwarescore=0 phishscore=0 bulkscore=0 spamscore=0 mlxscore=0 mlxlogscore=918 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1807170000 definitions=main-1810220129 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Define a simpler version of can_migrate_task called can_migrate_task_llc which does not require a struct lb_env argument, and judges whether a migration from one CPU to another within the same LLC should be allowed. Signed-off-by: Steve Sistare --- kernel/sched/fair.c | 28 ++++++++++++++++++++++++++++ 1 file changed, 28 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 4acdd8d..6548bed 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -7168,6 +7168,34 @@ int can_migrate_task(struct task_struct *p, struct lb_env *env) } /* + * Return true if task @p can migrate from @rq to @dst_rq in the same LLC. + * No need to test for co-locality, and no need to test task_hot(), as sharing + * LLC provides cache warmth at that level. + */ +static bool +can_migrate_task_llc(struct task_struct *p, struct rq *rq, struct rq *dst_rq) +{ + int dst_cpu = dst_rq->cpu; + + lockdep_assert_held(&rq->lock); + + if (throttled_lb_pair(task_group(p), cpu_of(rq), dst_cpu)) + return false; + + if (!cpumask_test_cpu(dst_cpu, &p->cpus_allowed)) { + schedstat_inc(p->se.statistics.nr_failed_migrations_affine); + return false; + } + + if (task_running(rq, p)) { + schedstat_inc(p->se.statistics.nr_failed_migrations_running); + return false; + } + + return true; +} + +/* * detach_task() -- detach the task for the migration from @src_rq to @dst_cpu. */ static void detach_task(struct task_struct *p, struct rq *src_rq, int dst_cpu) -- 1.8.3.1