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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no 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 77DA5C7618B for ; Sat, 27 Jul 2019 05:57:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4BDD420869 for ; Sat, 27 Jul 2019 05:57:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727890AbfG0F4o (ORCPT ); Sat, 27 Jul 2019 01:56:44 -0400 Received: from mx1.redhat.com ([209.132.183.28]:49180 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727246AbfG0F4o (ORCPT ); Sat, 27 Jul 2019 01:56:44 -0400 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6150836899; Sat, 27 Jul 2019 05:56:44 +0000 (UTC) Received: from t460p.redhat.com (ovpn-116-73.phx2.redhat.com [10.3.116.73]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8AA6819C71; Sat, 27 Jul 2019 05:56:38 +0000 (UTC) From: Scott Wood To: Sebastian Andrzej Siewior Cc: Thomas Gleixner , Steven Rostedt , Peter Zijlstra , Juri Lelli , Daniel Bristot de Oliveira , Clark Williams , linux-kernel@vger.kernel.org, linux-rt-users@vger.kernel.org Subject: [RT PATCH 0/8] migrate disable fixes and performance Date: Sat, 27 Jul 2019 00:56:30 -0500 Message-Id: <20190727055638.20443-1-swood@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.30]); Sat, 27 Jul 2019 05:56:44 +0000 (UTC) Sender: linux-rt-users-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org With these patches, a kernel build on a 104-cpu machine took around 75% less wall time and 85% less system time. Note that there is a difference in v5.2-rt compared to v5.0-rt. The performance with these patches is similar in both cases, but without these patches v5.2-rt is substantially slower. In v5.0-rt with a previous version of these patches, lazy migrate disable reduced kernel build time by around 15-20% wall and 70-75% system. Scott Wood (8): sched: migrate_enable: Use sleeping_lock to indicate involuntary sleep sched: __set_cpus_allowed_ptr: Check cpus_mask, not cpus_ptr sched: Remove dead __migrate_disabled() check sched: migrate disable: Protect cpus_ptr with lock sched/deadline: Reclaim cpuset bandwidth in .migrate_task_rq() sched: migrate_enable: Set state to TASK_RUNNING sched: migrate_enable: Use select_fallback_rq() sched: Lazy migrate_disable processing include/linux/cpu.h | 4 - include/linux/sched.h | 15 ++-- init/init_task.c | 4 + kernel/cpu.c | 97 ++++++++--------------- kernel/rcu/tree_plugin.h | 2 +- kernel/sched/core.c | 200 +++++++++++++++++++---------------------------- kernel/sched/deadline.c | 67 ++++++++-------- kernel/sched/sched.h | 4 + lib/smp_processor_id.c | 3 + 9 files changed, 166 insertions(+), 230 deletions(-) -- 1.8.3.1