Re: 2.4.20: Proccess stuck in __lock_page ...

Marcelo Tosatti
2003-05-27T19:57:48Z

On Tue, 27 May 2003, Andrea Arcangeli wrote:

> > It seems your "fix-pausing" patch is fixing a potential wakeup
> > miss, right? (I looked quickly throught it). Could you explain me the
>
> yes, not just one but multiple of them, all similar. lots of boxes were
> hanging in a weird manner until I found and fixed this glitch.
>
> > problem its trying to fix and how?
>
> I'm attaching the old email, it should have all the explanataions.
>
> but don't use that old patch (that was the first revision and it missed
> one last race in wait_for_request noticed by Chris or Andrew [or
> both?]), use this one instead (seems just the second revision, should be
> that one plus that last race fix):
>
> http://www.us.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.21rc2aa1/9980_fix-pausing-2

I wonder if the additional wakeups result in performance degradation (not
that it matters much in case there is no other way to fix the problem).

But anyway I would like to have some numbers with/without the patch.

Do you have them ?