linux-kernel - Re: [PATCH] ACPI : Update platform device numa node based on

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Message-ID: <13204058.j7zPSh58G6@aspire.rjw.lan>
Date:   Wed, 29 Mar 2017 00:15:09 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     shankerd@...eaurora.org
Cc:     Len Brown <lenb@...nel.org>,
        linux-acpi <linux-acpi@...r.kernel.org>,
        linux-kernel <linux-kernel@...r.kernel.org>,
        Vikram Sethi <vikrams@...eaurora.org>
Subject: Re: [PATCH] ACPI : Update platform device numa node based on _PXM method

On Tuesday, March 28, 2017 05:14:13 PM Shanker Donthineni wrote:
> Hi Rafael,
> 
> 
> On 03/28/2017 04:43 PM, Rafael J. Wysocki wrote:
> > On Tuesday, March 21, 2017 09:54:30 AM Shanker Donthineni wrote:
> >> The optional _PXM method evaluates to an integer that identifies the
> >> proximity domain of a device object. This patch implements support for
> >> ACPI _PXM method and updates the platform device numa node id using
> >> acpi_get_node(), which provides the PXM to NUMA mapping information.
> >>
> >> Signed-off-by: Shanker Donthineni <shankerd@...eaurora.org>
> > What exactly is the motivation here?
> 
> We have a couple of platform devices some of them are attached
> to socket0 and others to a different socket. We would like to covert
> memory allocations in Qualcomm platform device drivers to a NUMA
> aware allocation to improve performance.

All of the above information should be there in the patch changelog and
presumably the patch should be a part of a larger series so the way this
feature is going to be used is more clear.

Thanks,
Rafael