Re: [Xen-devel] [PATCH v3 5/6] xen: RCU: avoid busy waiting until the end of grace period.

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 05.09.17 at 19:13, <dario.faggioli@xxxxxxxxxx> wrote:
> On Wed, 2017-08-30 at 01:18 -0600, Jan Beulich wrote:
>> > > > On 29.08.17 at 18:06, <george.dunlap@xxxxxxxxxx> wrote:
>> > Dario is on holiday, and I think it would be good to get this
>> > functionality in sooner rather than later to shake out as many bugs
>> > as
>> > possible.  Would you be willing to let the idle timer period be set
>> > with
>> > a follow-up patch?
>> 
> So, I'm back, and can do such a patch.
> 
> Do we want to enforce a maximum value, to try to at least avoid severe
> injuries, even for users that shot themselves in the foot? Or we just
> accept anything which is below STIME_MAX?
> 
> I personally would only accept values smaller than 100ms (In fact, I
> was keeping it below that level in patch 6, where the heuristics was
> implemnted) or, if we really want, 1s.
> 
> Going above these values is basically equivalent to saying that the bug
> this series has fixed was not really a bug! :-/

I think an upper limit would be good to have.

Jan


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