Re: [rfc] "fair" rw spinlocks

[Linus Torvalds]

On Mon, 30 Nov 2009, Thomas Gleixner wrote:
> 
> Yeah, forgot to mention sched.c, but that's solvable

It should be fairly easy to add a few 'spin_lock(&tasklist_lock)' around 
stuff that really depended on exclusion from writers. That should 
_hopefully_ be the rare case.

The biggest problem is that there will almost inevitably be things that 
get missed, and any races exposed by lacking locking will be _very_ hard 
to debug and trigger. So what I'd be worried about is not getting to a 
"practically working" state, but any really subtle cases that nobody 
really hits in practice.

			Linus
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