Re: [RFC, PATCH] locks: remove posix deadlock detection

[Trond Myklebust]

On Sun, 2007-10-28 at 14:11 -0600, Matthew Wilcox wrote:
> On Sun, Oct 28, 2007 at 06:40:52PM +0000, Alan Cox wrote:
> > so we need to fix the bugs - the lock usage and the looping. At that
> > point it merely becomes a performance concern to those who use it, which
> > is the proper behaviour. If you want a faster non-checking one use
> > flock(), or add another flag that is a Linux "don't check for deadlock"
> 
> You can't fix the false EDEADLK detection without solving the halting
> problem.  Best of luck with that.

I can see that it would be difficult to do efficiently, but basically,
this boils down to finding a circular path in a graph. That is hardly an
unsolvable issue...

Trond

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