linux-kernel - Re: [PATCHv7 08/10] acpi/hmat: Register performance attributes

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Date:   Mon, 11 Mar 2019 11:21:52 +0000
From:   Jonathan Cameron <jonathan.cameron@...wei.com>
To:     Keith Busch <keith.busch@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-mm@...ck.org>, <linux-api@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Rafael Wysocki <rafael@...nel.org>,
        "Dave Hansen" <dave.hansen@...el.com>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCHv7 08/10] acpi/hmat: Register performance attributes

On Wed, 27 Feb 2019 15:50:36 -0700
Keith Busch <keith.busch@...el.com> wrote:

> Save the best performace access attributes and register these with the

performance

> memory's node if HMAT provides the locality table. While HMAT does make
> it possible to know performance for all possible initiator-target
> pairings, we export only the local pairings at this time.
> 
> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
> Signed-off-by: Keith Busch <keith.busch@...el.com>

Jonathan
> ---
>  drivers/acpi/hmat/Kconfig |  5 ++++-
>  drivers/acpi/hmat/hmat.c  | 10 +++++++++-
>  2 files changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/acpi/hmat/Kconfig b/drivers/acpi/hmat/Kconfig
> index 13cddd612a52..95a29964dbea 100644
> --- a/drivers/acpi/hmat/Kconfig
> +++ b/drivers/acpi/hmat/Kconfig
> @@ -2,7 +2,10 @@
>  config ACPI_HMAT
>  	bool "ACPI Heterogeneous Memory Attribute Table Support"
>  	depends on ACPI_NUMA
> +	select HMEM_REPORTING
>  	help
>  	 If set, this option has the kernel parse and report the
>  	 platform's ACPI HMAT (Heterogeneous Memory Attributes Table),
> -	 and register memory initiators with their targets.
> +	 register memory initiators with their targets, and export
> +	 performance attributes through the node's sysfs device if
> +	 provided.
> diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c
> index bb6a11653729..5b469c98a454 100644
> --- a/drivers/acpi/hmat/hmat.c
> +++ b/drivers/acpi/hmat/hmat.c
> @@ -549,12 +549,20 @@ static __init void hmat_register_target_initiators(struct memory_target *target)
>  	}
>  }
>  
> +static __init void hmat_register_target_perf(struct memory_target *target)
> +{
> +	unsigned mem_nid = pxm_to_node(target->memory_pxm);
> +	node_set_perf_attrs(mem_nid, &target->hmem_attrs, 0);
> +}
> +
>  static __init void hmat_register_targets(void)
>  {
>  	struct memory_target *target;
>  
> -	list_for_each_entry(target, &targets, node)
> +	list_for_each_entry(target, &targets, node) {
>  		hmat_register_target_initiators(target);
> +		hmat_register_target_perf(target);
> +	}
>  }
>  
>  static __init void hmat_free_structures(void)