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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1C9ECA0FFA for ; Tue, 5 Sep 2023 18:05:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236654AbjIESFS (ORCPT ); Tue, 5 Sep 2023 14:05:18 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237187AbjIESFD (ORCPT ); Tue, 5 Sep 2023 14:05:03 -0400 Received: from smtpout.efficios.com (unknown [IPv6:2607:5300:203:b2ee::31e5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2A280BE00 for ; Tue, 5 Sep 2023 10:47:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1693933807; bh=AcMD81TekA/JK8LoCnSfZUmeGklie5gXP/o4TUk+hg8=; h=From:To:Cc:Subject:Date:From; b=MbZ3+UHu2Hn7pCY3Vfd/ktDB78uR6Kon3udHrJMu5q8chkpW7mJUOFM+aeCcJjLSw ZZFk0Q0tdyzACEojrA4zSrXLpOEbJxWOxakZzVlJJ6vYJ+cNZwICHfFkzat3jOoxAC CnXztkQX3cscwR2Fiwg6AdTDQ38lX2Tz1s7g5yfZI4FhF1NqoilQANAPI7YC9XB+QF wYMXvlJFZd0SGjm6tnH3sWkS31iYC+ma4wuMc0sZAS0SmgUE6mVnvZIwqDLYDd0pRc hqCfo0iuAOohH8b4dGafx1fmlW4Kyz5jMT/jw1cD2XFMxlq4iYiGXR0JLwekcHqZBK +ZfcjqgeRg1IA== Received: from thinkos.internal.efficios.com (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4RgBp65H6tz1NXl; Tue, 5 Sep 2023 13:10:06 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Mathieu Desnoyers , Ingo Molnar , Valentin Schneider , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Vincent Guittot , Juri Lelli , Swapnil Sapkal , Aaron Lu , Julien Desfossez , x86@kernel.org Subject: [RFC PATCH 0/2] sched/eevdf: Rate limit task migration Date: Tue, 5 Sep 2023 13:11:03 -0400 Message-Id: <20230905171105.1005672-1-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.39.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Implement task migration rate limiting to speed up workload patterns such as hackbench which trigger frequent migrations. The first patch implements a simple rate limiting of 1 migration per 2ms. The second patch implements adaptative task migration rate limiting. I would be interested to hear feedback on this approach, especially about how it behaves on various workloads. Thanks, Mathieu Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Valentin Schneider Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Vincent Guittot Cc: Juri Lelli Cc: Swapnil Sapkal Cc: Aaron Lu Cc: Julien Desfossez Cc: x86@kernel.org Mathieu Desnoyers (2): sched: rate limit migrations to 1 per 2ms per task sched: Implement adaptative rate limiting of task migrations include/linux/sched.h | 4 ++++ kernel/sched/core.c | 3 +++ kernel/sched/fair.c | 40 ++++++++++++++++++++++++++++++++++++++++ kernel/sched/sched.h | 4 ++++ 4 files changed, 51 insertions(+) -- 2.39.2