linux-kernel - Re: [RFC PATCH] Documentation: DT: arm: add support for sockets defining package boundaries

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Date:   Tue, 20 Nov 2018 12:24:58 +0000
From:   Sudeep Holla <sudeep.holla@....com>
To:     Atish Patra <atish.patra@....com>
Cc:     Rob Herring <robh@...nel.org>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "palmer@...ive.com" <palmer@...ive.com>,
        "anup@...infault.org" <anup@...infault.org>,
        Damien Le Moal <Damien.LeMoal@....com>,
        "mick@....forth.gr" <mick@....forth.gr>,
        "mark.rutland@....com" <mark.rutland@....com>,
        "zong@...estech.com" <zong@...estech.com>,
        "alankao@...estech.com" <alankao@...estech.com>
Subject: Re: [RFC PATCH] Documentation: DT: arm: add support for sockets
 defining package boundaries

On Mon, Nov 19, 2018 at 05:18:42PM -0800, Atish Patra wrote:
> On 11/12/18 3:37 PM, Rob Herring wrote:
> > On Wed, Nov 07, 2018 at 05:13:44PM +0000, Sudeep Holla wrote:
> > > 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>
> > > ---
> > >   .../devicetree/bindings/arm/topology.txt      | 52 ++++++++++++++-----
> > >   1 file changed, 39 insertions(+), 13 deletions(-)
> > > 
> > > (Note patch generated with -b option to avoid 60+ of whitespace changes)
> > > 
> > > Hi Rob,
> > > 
> > > You had expressed your interest to generalise the CPU topology bindings
> > > accross multiple architectures. Do you want to move to the generic
> > > bindings before adding this $subject socket support or is it OK to
> > > finalise on this and then move the majority(based on the agreement)
> > > to generic binding.
> > 
> > Doesn't really matter to me as long as Risc-V folks are in agreement.
> > 
> > Otherwise, this looks fine to me.
> > 
> > Rob
> > 
> > 
> I can apply this patch in my unify topology series and resend everything
> together as one series.

Thanks for that. You can drop RFC when reposting. Remember to use -b
for ignoring space changes on this patch along with -M for renames in
your original patch series.

--
Regards,
Sudeep