Re: [Xen-devel] Strange PVM spinlock case revisited (nailed down)

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 14.02.13 at 15:21, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> wrote:
> Having more understanding now, I had a different idea. Not sure this is
> foolproof and surely is causing some more active spinning. But it looks like I
> also can keep the system from locking up (v3.2 kernel and the testcase) if I
> change xen_spin_unlock_slow to send the wakeup IPI to _all_ spinners instead 
> of only the first one found.

That, afaict, is an absolute requirement with the open coded
lock that you pointed at, as otherwise the code makes a
pseudo ticket assumption in believing to know who's going to
be the next owner of the lock.

Jan


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