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 679F8C7618E for ; Mon, 24 Apr 2023 13:22:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232135AbjDXNWr (ORCPT ); Mon, 24 Apr 2023 09:22:47 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47366 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232071AbjDXNWd (ORCPT ); Mon, 24 Apr 2023 09:22:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 70FDE5269 for ; Mon, 24 Apr 2023 06:22:19 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 9C29162228 for ; Mon, 24 Apr 2023 13:22:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id B2C49C433EF; Mon, 24 Apr 2023 13:22:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1682342534; bh=yBdfyn5nOnxEPBgiukEqv9eTSbVvU2JgPuc2MNVNOVI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=EirAQ6K7sHO+a4L8wX/D5QO60lXCArCWjgFoLwJ3Umnhxj+ZjC2Yr4d/mZUWP1McS v/kaLS90rD7sYCgn8wlQwsPhkuhYRLhGSeH1HSXdc+zLXPtuLR6xyiXH4zBAsswi3U k9jquDXnZP9vxRBlMcqQ1XKufzOsc8igYv3cLoQs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qais Yousef , "Peter Zijlstra (Intel)" , "Qais Yousef (Google)" Subject: [PATCH 5.15 49/73] sched/fair: Consider capacity inversion in util_fits_cpu() Date: Mon, 24 Apr 2023 15:17:03 +0200 Message-Id: <20230424131130.821848422@linuxfoundation.org> X-Mailer: git-send-email 2.40.0 In-Reply-To: <20230424131129.040707961@linuxfoundation.org> References: <20230424131129.040707961@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Qais Yousef commit aa69c36f31aadc1669bfa8a3de6a47b5e6c98ee8 upstream. We do consider thermal pressure in util_fits_cpu() for uclamp_min only. With the exception of the biggest cores which by definition are the max performance point of the system and all tasks by definition should fit. Even under thermal pressure, the capacity of the biggest CPU is the highest in the system and should still fit every task. Except when it reaches capacity inversion point, then this is no longer true. We can handle this by using the inverted capacity as capacity_orig in util_fits_cpu(). Which not only addresses the problem above, but also ensure uclamp_max now considers the inverted capacity. Force fitting a task when a CPU is in this adverse state will contribute to making the thermal throttling last longer. Signed-off-by: Qais Yousef Signed-off-by: Peter Zijlstra (Intel) Link: https://lore.kernel.org/r/20220804143609.515789-10-qais.yousef@arm.com (cherry picked from commit aa69c36f31aadc1669bfa8a3de6a47b5e6c98ee8) Signed-off-by: Qais Yousef (Google) Signed-off-by: Greg Kroah-Hartman --- kernel/sched/fair.c | 14 +++++++++----- 1 file changed, 9 insertions(+), 5 deletions(-) --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4159,12 +4159,16 @@ static inline int util_fits_cpu(unsigned * For uclamp_max, we can tolerate a drop in performance level as the * goal is to cap the task. So it's okay if it's getting less. * - * In case of capacity inversion, which is not handled yet, we should - * honour the inverted capacity for both uclamp_min and uclamp_max all - * the time. + * In case of capacity inversion we should honour the inverted capacity + * for both uclamp_min and uclamp_max all the time. */ - capacity_orig = capacity_orig_of(cpu); - capacity_orig_thermal = capacity_orig - arch_scale_thermal_pressure(cpu); + capacity_orig = cpu_in_capacity_inversion(cpu); + if (capacity_orig) { + capacity_orig_thermal = capacity_orig; + } else { + capacity_orig = capacity_orig_of(cpu); + capacity_orig_thermal = capacity_orig - arch_scale_thermal_pressure(cpu); + } /* * We want to force a task to fit a cpu as implied by uclamp_max.