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=-6.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT 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 9EC48C433EF for ; Mon, 20 Sep 2021 14:26:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 86646610CE for ; Mon, 20 Sep 2021 14:26:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237230AbhITO1x (ORCPT ); Mon, 20 Sep 2021 10:27:53 -0400 Received: from outbound-smtp22.blacknight.com ([81.17.249.190]:42412 "EHLO outbound-smtp22.blacknight.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236397AbhITO1w (ORCPT ); Mon, 20 Sep 2021 10:27:52 -0400 Received: from mail.blacknight.com (pemlinmail02.blacknight.ie [81.17.254.11]) by outbound-smtp22.blacknight.com (Postfix) with ESMTPS id D6476BB0A3 for ; Mon, 20 Sep 2021 15:26:24 +0100 (IST) Received: (qmail 4462 invoked from network); 20 Sep 2021 14:26:24 -0000 Received: from unknown (HELO stampy.112glenside.lan) (mgorman@techsingularity.net@[84.203.17.29]) by 81.17.254.9 with ESMTPA; 20 Sep 2021 14:26:24 -0000 From: Mel Gorman To: Peter Zijlstra Cc: Ingo Molnar , Vincent Guittot , Valentin Schneider , Aubrey Li , Barry Song , Srikar Dronamraju , LKML , Mel Gorman Subject: [PATCH 0/2] Scale wakeup granularity relative to nr_running Date: Mon, 20 Sep 2021 15:26:12 +0100 Message-Id: <20210920142614.4891-1-mgorman@techsingularity.net> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's unfortunate this is colliding with Plumbers but part of the discussions are on select_idle_sibling and hackbench is a common reference workload for evaluating select_idle_sibling. The downside is that hackbench is sensitive to other factors much more than the SIS cost. A major component is the value of kernel.sched_wakeup_granularity_ns and this series tackles that bit. Patch 1 is minor, it was spotted while developing patch 2. Patch 2 scales kernel.sched_wakeup_granularity_ns so allow tasks to avoid preemption longer when the machine is heavily overloaded. -- 2.31.1