Re: [PATCH v7 0/9] Add metrics for neoverse-n2-v2

[John Garry]

On 13/01/2023 09:22, Jing Zhang wrote:
> Changes since v6:
> - Split patch #1 into 3 smaller patches as suggested by Ian.
> - Change perf_pmu__get_slots into perf_pmu__cpu_slots_per_cycle,
>    per John's suggestion;
> - Return NAN instead of 0 in perf_pmu__cpu_slots_per_cycle weak
>    function, per John's suggestion;
> - Factor out pmu_core__find_same function, per John's suggestion.
> - Link:https://urldefense.com/v3/__https://lore.kernel.org/all/1673017529-1429208-1-git-send-email-renyu.zj@xxxxxxxxxxxxxxxxx/__;!!ACWV5N9M2RV99hQ!LhBq67uDCOsz1k7ZF4aQPHF0Bp8FsMr-ZNgCnBSUKF4qJTFODfnkId7lw_NXqB4qZUCpu-jbY8z8LTckoqFGz2Q8bA$  

This looks fine. But for this code:

On 13/01/2023 09:22, Jing Zhang wrote:
> +double perf_pmu__cpu_slots_per_cycle(void)
> +{
> +	char path[PATH_MAX];
> +	unsigned long long slots = 0;

I would prefer if this returned NAN (and not 0) for when we can't find a 
pmu or the value from ./caps/slots is zero, but I am not going to get 
too hung up on that.

For series:

Reviewed-by: John Garry <john.g.garry@xxxxxxxxxx>