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SubjectRe: [Xen-devel] [RFC v4 2/2] x86/xen: allow privcmd hypercalls to be preempted
>>> On 23.01.15 at 19:58, <mcgrof@suse.com> 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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