Re: [PATCH][RFC]: mutex: adaptive spin

[Linus Torvalds]

On Tue, 6 Jan 2009, Ingo Molnar wrote:
> 
> So instead of the BUG_ON() we could emit a WARN_ONCE() perhaps, plus not 
> do any spinning and just block - resulting in an uninterruptible task 
> (that the user will probably notice) and a scary message in the syslog? 
> [all in the slowpath]

Sure. You could put it in the adaptive function thing, with something like

	if (WARN_ONCE(waiter == owner))
		return 1;

which should fall back on the old behavior and do the one-time warning.

			Linus
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