Re: [Xen-devel] Xen PVM: Strange lockups when running PostgreSQL load

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 19.10.12 at 16:03, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> wrote:
> On 19.10.2012 11:24, Jan Beulich wrote:
>>>>> On 19.10.12 at 10:33, Stefan Bader <stefan.bader@xxxxxxxxxxxxx> wrote:
>>> I would be pragmatic here, none of the other current implementations seem
>>> to re-enable interrupts and so this only affects xen pv.
>> 
>> I don't think you really checked - the first arch I looked at (s390, as being
>> the most obvious one to look at when it comes to virtualization) quite
>> prominently re-enableds interrupts in arch_spin_lock_wait_flags().
> 
> No, I assumed that you saying native kernel did prior to ticket lock 
> conversion,

I indeed did say that. Just go look back at the old code.

Jan

> that this involves more historic search. And yes s390 is doing 
> virtualization
> quite a bit back into history. Just not paravirtualization.
> And when I look at arch_spin_lock_wait_flags() enabling/disabling is done 
> close
> by (at least I am not leaving off into some hypercall fog).



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel