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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 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 A4316C3F2C6 for ; Sun, 1 Mar 2020 03:11:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6BF9021D7D for ; Sun, 1 Mar 2020 03:11:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583032291; bh=ZUVdFgH1vJCAZMnf9e1GdLgCw44/12P7SIlksJcKsLQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=aKXfBIoimOFO5j1N2nBKA4e40zOleIwrPBqfMNUns22FeqwjDpMj8hCD1snpIlVKj cTQ3zwzXCOT0rmljjJR8Tx0EQYaIycJ/8X3amKnNV4yWHRFtYJ2LvGCuvAm/l1XDka GSRkf8/wqQkVqrbepsKt6IIFM3ZdYhOzYEVhIvO0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727228AbgCADLa (ORCPT ); Sat, 29 Feb 2020 22:11:30 -0500 Received: from mail.kernel.org ([198.145.29.99]:59296 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726786AbgCADLa (ORCPT ); Sat, 29 Feb 2020 22:11:30 -0500 Received: from localhost (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id D50962192A; Sun, 1 Mar 2020 03:11:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583032290; bh=ZUVdFgH1vJCAZMnf9e1GdLgCw44/12P7SIlksJcKsLQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=kBgdPv2dv7RO+zzgOXZ4OSNJM5lMjdbaKKHUOYJlbuaoVlELPP0Q3L+LNuCRBMXAW tJMz4LdEQvX/6CatG8U9g8Fu4sUxFYlwQOEDhkxcxyRMF1rdAxQ5wfa46MVBLVV1EE Bhq+dwZVW9pnpElTnskJhLQXTYKnSqnqfBXsi5q8= Date: Sat, 29 Feb 2020 22:11:28 -0500 From: Sasha Levin To: Vishnu Rangayyan Cc: stable@vger.kernel.org, gregkh@linuxfoundation.org, Andrew Forgue , vincent.guittot@linaro.org, peterz@infradead.org, dietmar.eggemann@arm.com, rafael.j.wysocki@intel.com Subject: Re: Fixes for 4.19 stable Message-ID: <20200301031128.GK21491@sasha-vm> References: <6CF798B4-B68B-4729-A496-2152FC032ABC@apple.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: <6CF798B4-B68B-4729-A496-2152FC032ABC@apple.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Fri, Feb 28, 2020 at 12:13:54PM -0800, Vishnu Rangayyan wrote: >Hi, > >I still see high (upto 30%) ksoftirqd cpu use with 4.19.101+ after these 2 back ports went in for 4.19.101 >(had all 4 backports applied earlier to our tree): > >commit f6783319737f28e4436a69611853a5a098cbe974 sched/fair: Fix insertion in rq->leaf_cfs_rq_list >commit 5d299eabea5a251fbf66e8277704b874bbba92dc sched/fair: Add tmp_alone_branch assertion > >perf shows for any given ksoftirqd, with 20k-30k processes on the system with high scheduler load: > 58.88% ksoftirqd/0 [kernel.kallsyms] [k] update_blocked_averages > >Can we backport these 2 also, confirmed that it fixes this behavior of ksoftirqd. > >commit 039ae8bcf7a5f4476f4487e6bf816885fb3fb617 upstream >commit 31bc6aeaab1d1de8959b67edbed5c7a4b3cdbe7c upstream Do we also need bef69dd87828 ("sched/cpufreq: Move the cfs_rq_util_change() call to cpufreq_update_util()") then? -- Thanks, Sasha