linux-kernel - Re: [PATCHv6 08/10] acpi/hmat: Register performance attributes

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Message-ID: <CAJZ5v0giQ+Xbjem-FLsYGestzBq9BpmpaQk8Zsa7-ry+Z=1gWw@mail.gmail.com>
Date:   Wed, 20 Feb 2019 23:04:19 +0100
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Keith Busch <keith.busch@...el.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Memory Management List <linux-mm@...ck.org>,
        Linux API <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: [PATCHv6 08/10] acpi/hmat: Register performance attributes

On Thu, Feb 14, 2019 at 6:10 PM Keith Busch <keith.busch@...el.com> wrote:
>
> Save the best performance access attributes and register these with the
> 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.
>
> Signed-off-by: Keith Busch <keith.busch@...el.com>

Acked-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

> ---
>  drivers/acpi/hmat/hmat.c | 17 ++++++++++++++++-
>  1 file changed, 16 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/acpi/hmat/hmat.c b/drivers/acpi/hmat/hmat.c
> index b29f7160c7bb..6833c4897ff4 100644
> --- a/drivers/acpi/hmat/hmat.c
> +++ b/drivers/acpi/hmat/hmat.c
> @@ -549,12 +549,27 @@ 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);
> +
> +       if (!target->hmem_attrs.read_bandwidth &&
> +           !target->hmem_attrs.read_latency &&
> +           !target->hmem_attrs.write_bandwidth &&
> +           !target->hmem_attrs.write_latency)
> +               return;
> +
> +       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)
> --
> 2.14.4
>