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Re: [PATCH v4 02/15] xen/cpufreq: extract _PSD info from "struct xen_processor_performance"
- To: "Penny, Zheng" <penny.zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 12 May 2025 17:45:25 +0200
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- Cc: "Huang, Ray" <Ray.Huang@xxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, "Orzel, Michal" <Michal.Orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Mon, 12 May 2025 15:45:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 06.05.2025 09:22, Penny, Zheng wrote:
>> -----Original Message-----
>> From: Jan Beulich <jbeulich@xxxxxxxx>
>> Sent: Monday, April 28, 2025 11:32 PM
>>
>> On 14.04.2025 09:40, Penny Zheng wrote:
>>> --- a/xen/drivers/cpufreq/cpufreq.c
>>> +++ b/xen/drivers/cpufreq/cpufreq.c
>>> + {
>>> + case XEN_PX_INIT:
>>> + if ( shared_type )
>>> + *shared_type = processor_pminfo[cpu]->perf.shared_type;
>>> + if ( domain_info )
>>> + *domain_info = processor_pminfo[cpu]->perf.domain_info;
>>
>> Does this need to be a structure copy? Can't you hand back just a pointer,
>> with the
>> function parameter being const struct xen_psd_package **?
>>
>
> I've considered handing backing a pointer, then maybe we need to allocate
> space for
> "struct xen_psd_package **domain_info = xvzalloc(struct xen_psd_package *);",
> and XVFREE(xxx)
> it in each exit, especially cpufreq_add_cpu() has a lot exits, which could be
> a few code churn.
> So I chose the struct copy to have the smallest change.
I fear I don't see why such allocations (of space holding a single pointer)
would be necessary. Afaict all you need is a local variable of the specific
(pointer) type, the address of which you pass into here.
Jan
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