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Re: [PATCH v5 07/18] xen/cpufreq: disable px statistic info in amd-cppc mode
- To: Penny Zheng <Penny.Zheng@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 12 Jun 2025 15:02:48 +0200
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- Cc: ray.huang@xxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 12 Jun 2025 13:03:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 27.05.2025 10:48, Penny Zheng wrote:
> We want to bypass construction of px statistic info, while not bypassing
> cpufreq_statistic_lock initialization for a good reason, in
> cpufreq_statistic_init() for amd-cppc mode, as P-states is not necessary
> there.
>
> Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>
> Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
I was considering to put this in together with patch 02 (if and when you
confirmed
that it can go in with the one hunk dropped), but then noticed that ...
> --- a/xen/drivers/cpufreq/utility.c
> +++ b/xen/drivers/cpufreq/utility.c
> @@ -98,6 +98,9 @@ int cpufreq_statistic_init(unsigned int cpu)
> if ( !pmpt )
> return -EINVAL;
>
> + if ( !(pmpt->init & XEN_PX_INIT) )
> + return 0;
... this check is pointless with how things are right now (the same check
living at
the top of the sole caller). Hence I think this change should be folded into
patch
04. Perhaps to be accompanied by a sentence why cpufreq_statistic_exit() doesn't
need a similar guard.
Jan
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