Re: [PATCH 3/3] xen: support runqueue steal time on xen

[Juergen Gross]

On 05/07/16 17:23, Stefano Stabellini wrote:
> On Wed, 22 Jun 2016, Juergen Gross wrote:
>> Up to now reading the stolen time of a remote cpu was not possible in a
>> performant way under Xen. This made support of runqueue steal time via
>> paravirt_steal_rq_enabled impossible.
>>
>> With the addition of an appropriate hypervisor interface this is now
>> possible, so add the support.
>>
>> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
>> ---
>>  drivers/xen/time.c | 42 +++++++++++++++++++++++++-----------------
>>  1 file changed, 25 insertions(+), 17 deletions(-)
>>
>> diff --git a/drivers/xen/time.c b/drivers/xen/time.c
>> index 2257b66..65afbe9 100644
>> --- a/drivers/xen/time.c
>> +++ b/drivers/xen/time.c
>> @@ -19,6 +19,9 @@
>>  /* runstate info updated by Xen */
>>  static DEFINE_PER_CPU(struct vcpu_runstate_info, xen_runstate);
>>  
>> +/* runstate info of remote cpu accessible */
>> +static bool xen_runstate_remote;
> 
> Honestly I would rather have one global variable less if it means only
> dropping one BUG_ON.

Okay, I'll remove it.


Juergen