From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:45632 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752337AbdBORHs (ORCPT ); Wed, 15 Feb 2017 12:07:48 -0500 Date: Wed, 15 Feb 2017 09:07:42 -0800 From: Greg KH To: Nikolay Borisov Cc: Peter Zijlstra , stable@vger.kernel.org, rabinv@axis.com, Ingo Molnar Subject: Re: Request for inclusion of fb90a6e93c0684 ("sched/debug: Don't dump sched debug info in SysRq-W") Message-ID: <20170215170742.GA3651@kroah.com> References: <0d90e505-aef8-4eea-1740-6ece6bfea9ea@gmail.com> <20170215091329.GN3093@worktop> <193a5ad1-b128-4809-ffeb-16c5a6889efa@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <193a5ad1-b128-4809-ffeb-16c5a6889efa@gmail.com> Sender: stable-owner@vger.kernel.org List-ID: On Wed, Feb 15, 2017 at 11:17:34AM +0200, Nikolay Borisov wrote: > On 15.02.2017 11:13, Peter Zijlstra wrote: > > On Wed, Feb 15, 2017 at 11:09:14AM +0200, Nikolay Borisov wrote: > >> Hello, > >> > >> I'd like to ask for the patch in the subject to be included in stable > >> kernels. Without it if one wants to see only the blocked stats this > >> becomes impossible since the information dumped by sched_debug is so > >> much that it overflows the kmsg buffer and information about blocked > >> stats is overwritten. This is especially a problem in distro kernels > >> which are based on 4.4 and have enabled CONFIG_SCHED_DEBUG - e.g. ubuntu. > > > > Who cares about the kmsg buffer? Also, just make it bigger or disable > > SCHED_DEBUG, as the name implies it _is_ a debug feature after all. > > but what if you want to use your distro's kernel and deal with custom > recompiles. That doesn't make sense, if your distro wants this information, it gets to pick what it wants. > The kernel ought to come with sensible defaults. You can turn it off if you have problems with it, I don't see this meeting the stable kernel rules. thanks, greg k-h