Re: [Xen-devel] [RFC v4 2/2] x86/xen: allow privcmd hypercalls to be preempted

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.01.15 at 19:58, <mcgrof@xxxxxxxx> wrote:
> On Fri, Jan 23, 2015 at 11:45:06AM +0000, David Vrabel wrote:
>> On 23/01/15 00:29, Luis R. Rodriguez wrote:
>> > @@ -1243,6 +1247,25 @@ void xen_evtchn_do_upcall(struct pt_regs *regs)
>> >    set_irq_regs(old_regs);
>> >  }
>> >  
>> > +/*
>> > + * CONFIG_PREEMPT=n kernels can end up triggering the softlock
>> > + * TASK_UNINTERRUPTIBLE hanger check (default 120 seconds)
>> > + * when certain multicalls are used [0] on large systems, in
>> > + * that case we need a way to voluntarily preempt. This is
>> > + * only an issue on CONFIG_PREEMPT=n kernels.
>> 
>> Rewrite this comment as;
>> 
>> * Some hypercalls issued by the toolstack can take many 10s of
> 
> Its not just hypercalls though, this is all about the interactions
> with multicalls no?

multicalls are just a special case of hypercalls.

Jan


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