Received: by 2002:a05:6a11:4021:0:0:0:0 with SMTP id ky33csp2307926pxb; Mon, 20 Sep 2021 18:20:57 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzBHOhTuTXPyL7ijvx12uvYdXnW/ir3ZrbzoYpCg+bWcRezvqNjsEQJkU9xhNal57y3MvPQ X-Received: by 2002:a5d:9d59:: with SMTP id k25mr8356528iok.70.1632187257040; Mon, 20 Sep 2021 18:20:57 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1632187257; cv=none; d=google.com; s=arc-20160816; b=ofP1jUweoiVlP1d+TaQwO+31MS15EOs6m1yAxSP4IOGIY2W/qKLqHh5egkp1NIo9Bo hqjqrmMR2vHqbFUyBjh6yjZiSI+hS5fVgcX6ylWXGNV44wskgXr7j7DBfo8Skl7VeOa6 P+lJylGx1FKhUI78Zs99rWQmbdbGHqB0EdedihVVto4jZS/w4xMu/ON6DMP6MKPzI8jt uUpMlmtY1xzAPXRW3PESakDKu294acsHlVHBHKhtK/s2gtEGC3mzPhmVpOyX9SNIm9ac iBKacRZvIRGGJEv4zxvSlMFROubFdPv2eXLlq56PRbQnjTk175HKSOdMAwu9bXjKEztk 9mWQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :message-id:date:subject:cc:to:from; bh=Wdv4Ro1wn3Decz5x9o9XZ3OICoEbi9Wk/SPIa18OOkg=; b=zwTaR1wj4+6v7VN+dkUc6z7+O7yZG6bzTGzKVdopuSfaC66HQEtwo3OPpXdtDSPnBQ a4O0vsUqRB4Y5FtHGmTgprBt89wjSKWa0qBhy/PWZ+KELSs4woJ6WTiyZqv3ZWCu7Aew jgPfJ1jnzCbf+c7qJRbbsk8oGBdKKlxuLv6XwIg5Y0ZclOkJAr6aHfDo+ascjSBkStJj uijnoaQ3u1L6WVIPhsdGpTelKFhsEWMxZqSSWZlAyfrKEtn+JTpBbMRLCP5eJ5nd3wv9 t1ekqUfF5N2akgjDqTnAiwsGpvlpQpZQBpTOv+wuqv0kdDNh8KuQIRa3eEvui4NVpPq9 xpUw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id t195si17904007iof.69.2021.09.20.18.20.45; Mon, 20 Sep 2021 18:20:57 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237135AbhITO1x (ORCPT + 99 others); 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