linux-kernel - Re: [PATCH v7 1/7] Documentation: DT: arm: add support for sockets defining package boundaries

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Message-ID: <alpine.DEB.2.21.9999.1906261724000.23534@viisi.sifive.com>
Date:   Wed, 26 Jun 2019 17:31:37 -0700 (PDT)
From:   Paul Walmsley <paul.walmsley@...ive.com>
To:     Sudeep Holla <sudeep.holla@....com>,
        Atish Patra <atish.patra@....com>
cc:     linux-kernel@...r.kernel.org, Rob Herring <robh@...nel.org>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <anup@...infault.org>,
        Catalin Marinas <catalin.marinas@....com>,
        "David S. Miller" <davem@...emloft.net>,
        devicetree@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Ingo Molnar <mingo@...nel.org>,
        Jonathan Cameron <Jonathan.Cameron@...wei.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        linux-riscv@...ts.infradead.org,
        Mark Rutland <mark.rutland@....com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        Morten Rasmussen <morten.rasmussen@....com>,
        Otto Sabart <ottosabart@...erm.com>,
        Palmer Dabbelt <palmer@...ive.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Richard Fontana <rfontana@...hat.com>,
        Rob Herring <robh+dt@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>,
        linux-arm-kernel@...ts.infradead.org,
        Russell King <linux@...linux.org.uk>
Subject: Re: [PATCH v7 1/7] Documentation: DT: arm: add support for sockets
 defining package boundaries

Hi Sudeep, Atish,

On Mon, 17 Jun 2019, Atish Patra wrote:

> From: Sudeep Holla <sudeep.holla@....com>
> 
> The current ARM DT topology description provides the operating system
> with a topological view of the system that is based on leaf nodes
> representing either cores or threads (in an SMT system) and a
> hierarchical set of cluster nodes that creates a hierarchical topology
> view of how those cores and threads are grouped.
> 
> However this hierarchical representation of clusters does not allow to
> describe what topology level actually represents the physical package or
> the socket boundary, which is a key piece of information to be used by
> an operating system to optimize resource allocation and scheduling.
> 
> Lets add a new "socket" node type in the cpu-map node to describe the
> same.
> 
> Signed-off-by: Sudeep Holla <sudeep.holla@....com>
> Reviewed-by: Rob Herring <robh@...nel.org>

This one doesn't apply cleanly here on top of v5.2-rc2, Linus's master 
branch, and next-20190626.  The reject file is below.  Am I missing 
a patch?


- Paul

--- Documentation/devicetree/bindings/arm/topology.txt
+++ Documentation/devicetree/bindings/arm/topology.txt
@@ -185,13 +206,15 @@ Bindings for cluster/cpu/thread nodes are defined as follows:
 4 - Example dts
 ===========================================
 
-Example 1 (ARM 64-bit, 16-cpu system, two clusters of clusters):
+Example 1 (ARM 64-bit, 16-cpu system, two clusters of clusters in a single
+physical socket):
 
 cpus {
 	#size-cells = <0>;
 	#address-cells = <2>;
 
 	cpu-map {
+		socket0 {
 			cluster0 {
 				cluster0 {
 					core0 {