From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg Kroah-Hartman Subject: Re: [PATCH wq/for-3.19 3/3] workqueue: dump workqueues on sysrq-t Date: Tue, 9 Dec 2014 23:50:57 -0500 Message-ID: <20141210045057.GA11973@kroah.com> References: <20141208174326.GB12274@htj.dyndns.org> <20141208174406.GC12274@htj.dyndns.org> <20141208174733.GD12274@htj.dyndns.org> <20141208100613.ecc66d89.akpm@linux-foundation.org> <20141208184035.GE12274@htj.dyndns.org> <20141208110515.7860d68baca2b3bd46c9dab7@linux-foundation.org> <20141208192229.GF12274@htj.dyndns.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20141208192229.GF12274@htj.dyndns.org> Sender: linux-kernel-owner@vger.kernel.org To: Tejun Heo , linux-serial@vger.kernel.org Cc: Andrew Morton , linux-kernel@vger.kernel.org, Lai Jiangshan , Linus Torvalds , Ingo Molnar List-Id: linux-serial@vger.kernel.org On Mon, Dec 08, 2014 at 02:22:29PM -0500, Tejun Heo wrote: > (cc'ing Greg for tty) > > On Mon, Dec 08, 2014 at 11:05:15AM -0800, Andrew Morton wrote: > > > Believe it or not, we already used up all alphanumerics if we count in > > > the arch-specific ones. Given that the workqueue information would > > > primarily be useful in tracking down hangs and we'd want to see the > > > dump of tasks in that case anyway, sysrq-t isn't a bad fit for > > > appending workqueue dump. If anybody has a better idea, I'm all ears. > > > > Really. Upper case? > > Greg, would using uppercase chars for sysrq work over the different > types of ttys? I'm dragging in linux-serial@vger here also, but I think uppercase characters will work from a tty standpoint. I don't know about keyboard scancodes, if they will do "odd" things wanting a shift with the sysrq key at the same time. Oh wait, I think that might be it, shift is needed for the sysrq key on the keyboard to start with, right? So there probably isn't a way to test the difference of a lower/upper case key here. I'm traveling this week, and don't have access to a "real" keyboard at the moment, but this should be pretty easy for someone to test who has one and cares about this type of thing {hint}. thanks, greg k-h