From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757000AbdELFtA (ORCPT ); Fri, 12 May 2017 01:49:00 -0400 Received: from LGEAMRELO12.lge.com ([156.147.23.52]:60616 "EHLO lgeamrelo12.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756099AbdELFs4 (ORCPT ); Fri, 12 May 2017 01:48:56 -0400 X-Original-SENDERIP: 156.147.1.126 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 165.244.98.204 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 10.177.222.33 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: , CC: , , , , Subject: [PATCH v4 0/5] Make find_later_rq() choose a closer cpu in topology Date: Fri, 12 May 2017 14:48:44 +0900 Message-ID: <1494568129-9985-1-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 X-MIMETrack: Itemize by SMTP Server on LGEKRMHUB05/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/05/12 14:48:52, Serialize by Router on LGEKRMHUB05/LGE/LG Group(Release 8.5.3FP6|November 21, 2013) at 2017/05/12 14:48:52, Serialize complete at 2017/05/12 14:48:52 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Change from v3 -. rename closest_cpu to best_cpu so that it align with rt -. protect referring cpudl.elements with cpudl.lock -. change return value of cpudl_find() to bool Change from v2 -. add support for SD_PREFER_SIBLING Change from v1 -. clean up the patch When cpudl_find() returns any among free_cpus, the cpu might not be closer than others, considering sched domain. For example: this_cpu: 15 free_cpus: 0, 1,..., 14 (== later_mask) best_cpu: 0 topology: 0 --+ +--+ 1 --+ | +-- ... --+ 2 --+ | | +--+ | 3 --+ | ... ... 12 --+ | +--+ | 13 --+ | | +-- ... -+ 14 --+ | +--+ 15 --+ In this case, it would be best to select 14 since it's a free cpu and closest to 15(this_cpu). However, currently the code select 0(best_cpu) even though that's just any among free_cpus. Fix it. Byungchul Park (5): sched/deadline: Refer to cpudl.elements atomically sched/deadline: Make find_later_rq() choose a closer cpu in topology sched/deadline: Change return value of cpudl_find() sched/deadline: Add support for SD_PREFER_SIBLING on find_later_rq() sched/rt: Add support for SD_PREFER_SIBLING on find_lowest_rq() kernel/sched/cpudeadline.c | 46 +++++++++++++++++++++++++++++++------------- kernel/sched/deadline.c | 48 +++++++++++++++++++++++++++++++--------------- kernel/sched/rt.c | 17 ++++++++++++++++ 3 files changed, 83 insertions(+), 28 deletions(-) -- 1.9.1