From mboxrd@z Thu Jan 1 00:00:00 1970 From: Steven Rostedt Subject: Re: [GIT RFC PULL rcu/urgent] Prevent Kconfig from asking pointless questions Date: Mon, 20 Apr 2015 14:01:07 -0400 Message-ID: <20150420180107.GE24936@home.goodmis.org> References: <20150416183812.GA5571@linux.vnet.ibm.com> <20150418130340.GA26931@gmail.com> <20150418133444.GD23685@linux.vnet.ibm.com> <20150418143238.GA2337@gmail.com> <20150419020541.GA5561@linux.vnet.ibm.com> <20150420113554.598e503f@sluggy> <20150420170902.GU5561@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Clark Williams , Ingo Molnar , linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, a.p.zijlstra@chello.nl, akpm@linux-foundation.org, linux-rt-users@vger.kernel.org To: "Paul E. McKenney" Return-path: Content-Disposition: inline In-Reply-To: <20150420170902.GU5561@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-rt-users.vger.kernel.org On Mon, Apr 20, 2015 at 10:09:03AM -0700, Paul E. McKenney wrote: > > The sysfs knob might be nice, but as far as I know nobody has been > complaining about it. > > Besides, we already have the rcutree.kthread_prio= kernel-boot parameter. > So how about if the Kconfig parameter selects either SCHED_OTHER > (the default) or SCHED_FIFO:1, and then the boot parameter can be used > to select other values. > > That said, if the lack of a sysfs knob has been causing real problems, > let's make that happen. But then it's too late, because the time of something getting into the kernel to the time people can use it can be months if not years. I see no harm in adding one. Pretty much every kernel parameter I added for ftrace, has a sysctrl knob for it. (Not a sysfs knob, but a /proc/sys/kernel knob which is different). -- Steve