Re: [PATCH v2 4/4] thermal: intel: hfi: Increase the number of CPU capabilities per netlink event

["Zhang, Rui" <rui.zhang@intel.com>]

On Tue, 2024-05-07 at 20:43 -0700, Ricardo Neri wrote:
> The number of updated CPU capabilities per netlink event is hard-
> coded to
> 16. On systems with more than 16 CPUs (a common case), it takes more
> than
> one thermal netlink event to relay all the new capabilities after an
> HFI
> interrupt. This adds unnecessary overhead to both the kernel and user
> space
> entities.
> 
> Increase the number of CPU capabilities updated per event to 64. Any
> system
> with 64 CPUs or less can now update all the capabilities in a single
> thermal netlink event.
> 
> Signed-off-by: Ricardo Neri <ricardo.neri-calderon@linux.intel.com>

Acked-by: Zhang Rui <rui.zhang@intel.com>

-rui
> ---
> Cc: Len Brown <len.brown@intel.com>
> Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
> Cc: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com>
> Cc: Zhang Rui <rui.zhang@intel.com>
> Cc: linux-pm@vger.kernel.org
> Cc: linux-kernel@vger.kernel.org
> ---
> Changes since v2:
>  * Dropped the debugfs interface. Instead, increased the size of the
>    thermal netlink message size to 64 CPU capabilities.
> ---
>  drivers/thermal/intel/intel_hfi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/thermal/intel/intel_hfi.c
> b/drivers/thermal/intel/intel_hfi.c
> index c6658f8c5cca..a180a98bb9f1 100644
> --- a/drivers/thermal/intel/intel_hfi.c
> +++ b/drivers/thermal/intel/intel_hfi.c
> @@ -167,7 +167,7 @@ static DEFINE_MUTEX(hfi_instance_lock);
>  
>  static struct workqueue_struct *hfi_updates_wq;
>  #define HFI_UPDATE_DELAY_MS            100
> -#define HFI_THERMNL_CAPS_PER_EVENT     16
> +#define HFI_THERMNL_CAPS_PER_EVENT     64
>  
>  static void get_hfi_caps(struct hfi_instance *hfi_instance,
>                          struct thermal_genl_cpu_caps *cpu_caps)