linux-kernel - Re: [PATCH V6 0/7] ACPI: Support Generic Initiator proximity domains

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Message-ID: <dc5f5502-09c6-d476-db0e-0af3412bb031@gmail.com>
Date:   Wed, 18 Dec 2019 12:32:06 +0100
From:   Brice Goglin <brice.goglin@...il.com>
To:     Jonathan Cameron <Jonathan.Cameron@...wei.com>, linux-mm@...ck.org,
        linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, x86@...nel.org
Cc:     Keith Busch <keith.busch@...el.com>, jglisse@...hat.com,
        "Rafael J . Wysocki" <rjw@...ysocki.net>, linuxarm@...wei.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Tao Xu <tao3.xu@...el.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Hanjun Guo <guohanjun@...wei.com>,
        Sudeep Holla <sudeep.holla@....com>
Subject: Re: [PATCH V6 0/7] ACPI: Support Generic Initiator proximity domains

Le 16/12/2019 à 16:38, Jonathan Cameron a écrit :
> Introduces a new type of NUMA node for cases where we want to represent
> the access characteristics of a non CPU initiator of memory requests,
> as these differ from all those for existing nodes containing CPUs and/or
> memory.
>
> These Generic Initiators are presented by the node access0 class in
> sysfs in the same way as a CPU.   It seems likely that there will be
> usecases in which the best 'CPU' is desired and Generic Initiators
> should be ignored.  The final few patches in this series introduced
> access1 which is a new performance class in the sysfs node description
> which presents only CPU to memory relationships.  Test cases for this
> are described below.


Hello Jonathan

If I want to test this with a fake GI, what are the minimal set of
changes I should put in my ACPI tables? Can I just specify a dummy GI in
SRAT? What handle should I use there?

Thanks

Brice