Re: [Xen-devel] [PATCH 2/3] xen: Have schedulers revise initial placement

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.08.16 at 16:09, <dario.faggioli@xxxxxxxxxx> wrote:
> On Fri, 2016-08-05 at 07:24 -0600, Jan Beulich wrote:
>> > > > On 01.08.16 at 14:32, <dario.faggioli@xxxxxxxxxx> wrote:
>> > On Mon, 2016-08-01 at 04:40 -0600, Jan Beulich wrote:
>> > > > > > On 15.07.16 at 20:02, <george.dunlap@xxxxxxxxxx> wrote:
>> > > > Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxx>
>> > > Should this and patch 3 be backported?
>> > > 
>> > Yes, I think they're good backporting candidates.
>> Well, they appear to work fine on 4.7, but putting them onto 4.5
>> causes an early boot crash (BUG_ON( cpu != svc->vcpu->processor )
>> in __runq_insert()). Pulling in e59321d154 ("credit: remove cpu
>> argument to __runq_insert()") obviously makes that crash go
>> away, just to, a little later, hit the similar one close to the top
>> of
>> csched_load_balance().
>> 
> Ah, I see.. Thanks for trying and letting us know.
> 
>> I'd really like to have those backported, but I have to ask one
>> of you to identify which prereq-s are needed on 4.6 and 4.5
>> (I'll revert them from 4.5 right away, but I'll wait for an osstest
>> flight to confirm the same issue exists on 4.6). On 4.5 I'd then
>> additionally depend on you to indicate whether sedf needs
>> some additional adjustment.
>> 
> Ok. I can't, immediately.
> 
> But if Monday is fine, I'm happy to take care of this.

Oh, of course, any time next week would be fine. I'd like to have
this for 4.5.4, but in the worst case we'll ship that without it.

Jan


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