Re: generate random numbers

["michele.paolino" <michele.paolino@studio.unibo.it>]

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Line 184 correspond at rc = 0 (an int variable) of remove_entry() function.
I don't have modified that file.

Michele


On Fri, Feb 26, 2010 at 6:44 PM, George Dunlap
<george.dunlap@eu.citrix.com>wrote:

> Did you look at timer.c, line 184, to find out what the BUG is?
> -George
>
> michele.paolino wrote:
>
>> Following George's advices I have rewrited my scheduler. But now serial
>> console's log report me a bug in a function of timer.c
>>
>> (XEN) ****************************************
>> (XEN) Panic on CPU 0:
>> (XEN) Xen BUG at timer.c:184
>> (XEN) ****************************************
>>
>> This is caused by cpumask_raise_softirq() in my wake() function. What can
>> I do?
>>
>> Michele
>>
>> On Thu, Feb 25, 2010 at 10:25 PM, George Dunlap <
>> george.dunlap@eu.citrix.com <mailto:george.dunlap@eu.citrix.com>> wrote:
>>
>>    The problem is that you're choosing a random vcpu to run, without
>>    considering whether it *wants* to run or not.  In this case,
>>    you're running a vcpu before it's even been completely set up yet
>>    (write_cr3 is failing because the guest *has* no cr3 ready yet).
>>
>>    The normal way schedulers deal with this is to keep one list of
>>    all vcpus (or all domains), and another list with "runnable"
>>    vcpus.  You can keep track of which vcpus are runnable with the
>>    vcpu_wake() callback and by using vcpu_runnable() in schedule().
>>
>>    At very least, your loop in schedule should check vcpu_runnable()
>>    before selecting it.
>>
>>    -George
>>
>>
>>    michele.paolino wrote:
>>
>>        Here's my random scheduler. It works until I start a virtual
>>        machine (error file attached is the serial console's log).
>>        In xen call trace there isn't any of my functions.
>>        To generate random numbers I'm using the hash (MD5) of NOW()
>>        function.
>>        I would also Know why at boot time there are two calls at
>>        vcpu_init function for vcpu with id = 0 ??
>>
>>        Thanks
>>        Michele
>>
>>
>>
>>
>

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