Re: [Xen-devel] [PATCH v2 01/15] xen/arm: register mmio handler at runtime

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 04/08/2014 11:34 AM, Vijay Kilari wrote:
>>>>>
>>>>>>
>>>>>> [..]
>>>>>>
>>>>>>> diff --git a/xen/include/asm-arm/domain.h b/xen/include/asm-arm/domain.h
>>>>>>> index 50b9b54..23dac85 100644
>>>>>>> --- a/xen/include/asm-arm/domain.h
>>>>>>> +++ b/xen/include/asm-arm/domain.h
>>>>>>> @@ -116,6 +116,7 @@ struct arch_domain
>>>>>>>      struct hvm_domain hvm_domain;
>>>>>>>      xen_pfn_t *grant_table_gpfn;
>>>>>>>
>>>>>>> +    struct io_handler *io_handlers;
>>>>>>
>>>>>> Why do you need a pointer here? I think can can directly use
>>>>>> struct io_handler iohandlers.
>>>>>>
>>>>>   I just adds to increase the size of this arch_domain struct.
>>>>> so allocated memory at runtime.
>>>>
>>>> Do you hit the page size?
>>> Yes, I have faced page size exhausted issue which I have reported earlier
>>
>> Did you still have the issue when you moved out GICv stuff outside?
> Now I am not getting this issue. But I feel we are on the edge. So it
> is always better
> to allocate runtime.

Hmmmm... we are not on the edge with the current Xen:
   - arm32: sizeof(struct domain) = 1024
   - arm64: sizeof(struct domain) = 1408

Unless if you have added lots of fields in the structure, there is no
reason to use a pointer here.

Regards,

-- 
Julien Grall

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