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Re: [Xen-devel] [PATCH v9 1/6] x86: detect and initialize Cache QoS Monitoring feature

>>> On 18.03.14 at 15:44, "Xu, Dongxiao" <dongxiao.xu@xxxxxxxxx> wrote:
>> From: Andrew Cooper [mailto:andrew.cooper3@xxxxxxxxxx]
>> There is a sensible upper bound for rmid_max, in the init function.
>> There should be a set of pointers (one per socket), allocated on use,
>> which can contain rmid_max data.
>> Once allocated, they are large enough for any eventuality, and don't
>> need de/reallocating. This way, the amount of memory used is
>> sockets_inuse * rmid_max.
> Hmm, this might be a good proposal, since according to the SDM (figure 
> 17-20), the possible maximum rmid value may be 2^10=1024.
> Therefore for each socket, 2 pages are enough. (1024 * 8 = 8192)
> But we may need to track such per-socket structure in CPU online/offline 
> logic.
> Jan, what's your opinion?

Sounds reasonable if you can make it work cleanly.


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