linux-kernel - [PATCH v12 6/6] docs: mm: numaperf.rst Add brief description for access class 1.

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Message-ID: <20200930140547.840251-7-Jonathan.Cameron@huawei.com>
Date:   Wed, 30 Sep 2020 22:05:47 +0800
From:   Jonathan Cameron <Jonathan.Cameron@...wei.com>
To:     <linux-mm@...ck.org>, <linux-acpi@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>, <x86@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        <rafael@...nel.org>, Ingo Molnar <mingo@...hat.com>
CC:     Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>, <linuxarm@...wei.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Brice Goglin <Brice.Goglin@...ia.fr>,
        "Sean V Kelley" <sean.v.kelley@...ux.intel.com>,
        <linux-api@...r.kernel.org>, "Borislav Petkov" <bp@...en8.de>,
        Hanjun Guo <guohanjun@...wei.com>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>
Subject: [PATCH v12 6/6] docs: mm: numaperf.rst Add brief description for access class 1.

Try to make minimal changes to the document which already describes
access class 0 in a generic fashion (including IO initiatiors that
are not CPUs).

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
---
 Documentation/admin-guide/mm/numaperf.rst | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/Documentation/admin-guide/mm/numaperf.rst b/Documentation/admin-guide/mm/numaperf.rst
index 4d69ef1de830..86f2a3c4b638 100644
--- a/Documentation/admin-guide/mm/numaperf.rst
+++ b/Documentation/admin-guide/mm/numaperf.rst
@@ -56,6 +56,11 @@ nodes' access characteristics share the same performance relative to other
 linked initiator nodes. Each target within an initiator's access class,
 though, do not necessarily perform the same as each other.
 
+The access class "1" is used to allow differentiation between initiators
+that are CPUs and hence suitable for generic task scheduling, and
+IO initiators such as GPUs and NICs.  Unlike access class 0, only
+nodes containing CPUs are considered.
+
 ================
 NUMA Performance
 ================
@@ -88,6 +93,9 @@ The latency attributes are provided in nanoseconds.
 The values reported here correspond to the rated latency and bandwidth
 for the platform.
 
+Access class 1 takes the same form but only includes values for CPU to
+memory activity.
+
 ==========
 NUMA Cache
 ==========
-- 
2.19.1