linux-kernel - Re: [PATCH][RFC]: mutex: adaptive spin

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Message-ID: <alpine.LFD.2.00.0901060841000.3057@localhost.localdomain>
Date:	Tue, 6 Jan 2009 08:42:41 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
cc:	Peter Zijlstra <peterz@...radead.org>,
	Matthew Wilcox <matthew@....cx>,
	Andi Kleen <andi@...stfloor.org>,
	Chris Mason <chris.mason@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	linux-btrfs <linux-btrfs@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [PATCH][RFC]: mutex: adaptive spin



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
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