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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen 4.5 random freeze question
On Wed, Nov 19, 2014 at 3:26 PM, Julien Grall <julien.grall@xxxxxxxxxx> wrote: > On 11/19/2014 12:40 PM, Andrii Tseglytskyi wrote: >> Hi Julien, >> >> On Wed, Nov 19, 2014 at 2:23 PM, Julien Grall <julien.grall@xxxxxxxxxx> >> wrote: >>> On 11/19/2014 12:17 PM, Stefano Stabellini wrote: >>>> On Wed, 19 Nov 2014, Ian Campbell wrote: >>>>> On Wed, 2014-11-19 at 11:42 +0000, Stefano Stabellini wrote: >>>>>> So it looks like there is not actually anything wrong, is just that you >>>>>> have too much inflight irqs? It should cause problems because in that >>>>>> case GICH_HCR_UIE should be set and you should get a maintenance >>>>>> interrupt when LRs become available (actually when "none, or only one, >>>>>> of the List register entries is marked as a valid interrupt"). >>>>>> >>>>>> Maybe GICH_HCR_UIE is the one that doesn't work properly. >>>>> >>>>> How much testing did this aspect get when the no-maint-irq series >>>>> originally went in? Did you manage to find a workload which filled all >>>>> the LRs or try artificially limiting the number of LRs somehow in order >>>>> to provoke it? >>>>> >>>>> I ask because my intuition is that this won't happen very much, meaning >>>>> those code paths may not be as well tested... >>>> >>>> I did test it by artificially limiting the number of LRs to 1. >>>> However there have been many iterations of that series and I didn't run >>>> this test at every iteration. >>> >>> am I the only to think this may not be related to this bug? All the LRs >>> are full with IRQ of the same priority. So it's valid. >>> >>> As gic_restore_pending_irqs is called every time that we return to the >>> guest. It could be anything else. >>> >>> It would be interesting to see why we are trapping all the time in Xen. >>> >> >> I may perform any test if you have some specific scenario. > > I have no specific scenario in my mind :/. > > It looks like I'm able to reproduce it on my ARM board by the restricted > the number of LRs to 1. > Do you mean that you got a hang with current xen/master branch ? Regards, Andrii > I will investigate. > > Regards, > > -- > Julien Grall -- Andrii Tseglytskyi | Embedded Dev GlobalLogic www.globallogic.com _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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