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, URIBL_BLOCKED,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 EF125C4360C for ; Fri, 27 Sep 2019 13:13:34 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B668620872 for ; Fri, 27 Sep 2019 13:13:34 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569590014; bh=MK+P96GC5HKYWnKCTtPCrYuMwfryz+prcsSeIhZismY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=W06Iyzsv6R/AUvOGAdzCix3v66Vx9X5WNDBnni+PfyKRyG7j6/fvabQP9k+ZJR5EC srNt4vVvKsL0t1pcT7I/iFi6RAC2dyw2oUL8OFHkwmX6Gxg27yW/itd+6RRdLJvN26 omIgNN6eybaFyJd7DvaivB4f84kESOuScOY37dC8= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726540AbfI0NNe (ORCPT ); Fri, 27 Sep 2019 09:13:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:41530 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725992AbfI0NNe (ORCPT ); Fri, 27 Sep 2019 09:13:34 -0400 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 71EB5207FF; Fri, 27 Sep 2019 13:13:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1569590013; bh=MK+P96GC5HKYWnKCTtPCrYuMwfryz+prcsSeIhZismY=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=j+YdHOKGgukkPM1gweEclJhKJHpamlvqRq4g7wTdwJLZuW9Rpa1Yh8cyVT3Ko7DQu FOUrtAYLOPsCoJfCuJLcfuvSboOAYW0hn6M1vZDkvnQBAjkPwHQoM8cknfEaLMlBH8 jiHeLIkXrutywttsjSpyYy62cBOfMgHOLVyW2Eao= Date: Fri, 27 Sep 2019 09:13:32 -0400 From: Sasha Levin To: Dave Chiluk Cc: Greg KH , Ben Segall , Peter Zijlstra , Phil Auld , stable@vger.kernel.org Subject: Re: Please backport de53fd7aedb1 : sched/fair: Fix low cpu usage with high throttling by removing expiration of cpu-local slices Message-ID: <20190927131332.GO8171@sasha-vm> References: <20190925064414.GA1449297@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: 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, Sep 27, 2019 at 01:12:40AM -0500, Dave Chiluk wrote: >On Wed, Sep 25, 2019 at 1:44 AM Greg KH wrote: >> >> On Wed, Sep 25, 2019 at 12:53:48AM -0500, Dave Chiluk wrote: >> > Commit de53fd7aedb1 ("sched/fair: Fix low cpu usage with high >> > throttling by removing expiration of cpu-local slices") fixes a major >> > performance issue for containerized clouds such as Kubernetes. >> > >> > Commit de53fd7aedb1 Fixes commit : 512ac999d275 ("sched/fair: Fix >> > bandwidth timer clock drift condition"). >> > >> > This should be applied to all stable kernels that applied commit >> > 512ac999d275, and should probably be applied to all others as well. >> >> As this commit isn't in a released kernel just yet, we should wait to >> see what happens when it hits people's machines, right? > >I think waiting till 5.4 is released would be irresponsible on this >one. 512ac999 was recently pushed back into many of the distro The "released kernel" statement means 5.4-rc1 rather than 5.4, which is just a few days away. -- Thanks, Sasha