linux-kernel - Re: [PATCHv5 07/10] acpi/hmat: Register performance attributes

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Date:   Wed, 6 Feb 2019 12:24:58 +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>,
        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: [PATCHv5 07/10] acpi/hmat: Register performance attributes

On Thu, 24 Jan 2019 16:07:21 -0700
Keith Busch <keith.busch@...el.com> wrote:

> Register the local attached performace access attributes with the memory's
performance

> 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 and matching pairings at this time.
> 
> Signed-off-by: Keith Busch <keith.busch@...el.com>
> ---
>  drivers/acpi/hmat/Kconfig |  1 +
>  drivers/acpi/hmat/hmat.c  | 14 ++++++++++++++
>  2 files changed, 15 insertions(+)
> 
> diff --git a/drivers/acpi/hmat/Kconfig b/drivers/acpi/hmat/Kconfig
> index c9637e2e7514..08e972ead159 100644
> --- a/drivers/acpi/hmat/Kconfig
> +++ b/drivers/acpi/hmat/Kconfig
> @@ -2,6 +2,7 @@
>  config ACPI_HMAT
>  	bool "ACPI Heterogeneous Memory Attribute Table Support"
>  	depends on ACPI_NUMA
> +	select HMEM_REPORTING
>  	help
>  	 If set, this option causes the kernel to set the memory NUMA node
>  	 relationships and access attributes in accordance with ACPI HMAT
> diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c
> index 85fd835c2e23..917e6122b3f0 100644
> --- a/drivers/acpi/hmat/hmat.c
> +++ b/drivers/acpi/hmat/hmat.c
> @@ -430,6 +430,19 @@ static __init void hmat_register_target_initiators(struct memory_target *target)
>  		hmat_register_if_local(target, initiator);
>  }
>  
> +static __init void hmat_register_target_perf(struct memory_target *target)
> +{
> +	unsigned mem_nid = pxm_to_node(target->memory_pxm);
> +	struct node_hmem_attrs hmem_attrs = {
> +		.read_bandwidth	= target->read_bandwidth,
> +		.write_bandwidth= target->write_bandwidth,
> +		.read_latency	= target->read_latency,
> +		.write_latency	= target->write_latency,
> +	};
> +
> +	node_set_perf_attrs(mem_nid, &hmem_attrs, 0);
> +}
> +
>  static __init void hmat_register_targets(void)
>  {
>  	struct memory_target *target, *tnext;
> @@ -439,6 +452,7 @@ static __init void hmat_register_targets(void)
>  	list_for_each_entry_safe(target, tnext, &targets, node) {
>  		list_del(&target->node);
>  		hmat_register_target_initiators(target);
> +		hmat_register_target_perf(target);
>  		kfree(target);
>  	}
>