[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] Xen 4.5 random freeze question
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. I will investigate. Regards, -- Julien Grall _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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