Re: [Xen-ia64-devel] [PATCH] NEW_TLBFLUSH_CLOCK_PERIOD_SOFTIRQ is notregistered.

[Kouya SHIMURA <kouya@xxxxxxxxxxxxxx>]

Hi,

Isaku Yamahata writes:
 > > Kouya SHIMURA write on 2007年1月26日 19:06:
 > > > Hi
 > > > 
 > > > NEW_TLBFLUSH_CLOCK_PERIOD_SOFTIRQ is used but not registered.
 > > > I've never experienced but system will panic in the very long run.
 > > > I wonder why Isaku missed it.
 > 
 > Ouch!
 > It doesn't cause panic, but it just becomes slow.
 > So I missed it.

No, it will cause a null-pointer exception at do_softirq() in Xen.
        (*softirq_handlers[i])();

(XEN) $$$$$ PANIC in domain 0 (k6=0xf000000007c38000): *** 
xen_handle_domain_access: exception table lookup failed, 
iip=0xf000000004043e60, addr=0x0, spinning...
[snip]
(XEN)  [<f000000004043e60>] do_softirq+0x120/0x1b0
(XEN)                                 sp=f000000007c3fe00 bsp=f000000007c39390


I tried it by means of setting tlbflush_clock to huge value.

Anyway, I think it is not concerned with Anthony's problem.

Thanks,
Kouya


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