From mboxrd@z Thu Jan 1 00:00:00 1970 From: Linus Torvalds Subject: Re: [PATCH][RFC]: mutex: adaptive spin Date: Tue, 6 Jan 2009 08:42:41 -0800 (PST) Message-ID: References: <1230722935.4680.5.camel@think.oraclecorp.com> <20081231104533.abfb1cf9.akpm@linux-foundation.org> <1230765549.7538.8.camel@think.oraclecorp.com> <87r63ljzox.fsf@basil.nowhere.org> <20090103191706.GA2002@parisc-linux.org> <1231093310.27690.5.camel@twins> <20090104184103.GE2002@parisc-linux.org> <1231242031.11687.97.camel@twins> <20090106121052.GA27232@elte.hu> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Cc: Peter Zijlstra , Matthew Wilcox , Andi Kleen , Chris Mason , Andrew Morton , linux-kernel@vger.kernel.org, linux-fsdevel , linux-btrfs , Thomas Gleixner , Steven Rostedt , Gregory Haskins , Nick Piggin To: Ingo Molnar Return-path: In-Reply-To: List-ID: On Tue, 6 Jan 2009, Linus Torvalds wrote: > > Right now, if some process deadlocks on a mutex, we get hung process, but > with a nice backtrace and hopefully other things (that don't need that > lock) still continue to work. Clarification: the "nice backtrace" we only get with something like sysrq-W, of course. We don't get a backtrace _automatically_, but with an otherwise live machine, there's a better chance that people do get wchan or other info. IOW, it's at least a fairly debuggable situation. Linus