linux-kernel - Re: [PATCHv4 05/13] Documentation/ABI: Add new node sysfs attributes

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Date:   Fri, 18 Jan 2019 11:21:34 +0000
From:   Jonathan Cameron <jonathan.cameron@...wei.com>
To:     Keith Busch <keith.busch@...el.com>
CC:     <linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
        <linux-mm@...ck.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael Wysocki" <rafael@...nel.org>,
        Dave Hansen <dave.hansen@...el.com>,
        "Dan Williams" <dan.j.williams@...el.com>
Subject: Re: [PATCHv4 05/13] Documentation/ABI: Add new node sysfs
 attributes

On Wed, 16 Jan 2019 10:57:56 -0700
Keith Busch <keith.busch@...el.com> wrote:

> Add entries for memory initiator and target node class attributes.
> 
> Signed-off-by: Keith Busch <keith.busch@...el.com>
> ---
>  Documentation/ABI/stable/sysfs-devices-node | 25 ++++++++++++++++++++++++-
>  1 file changed, 24 insertions(+), 1 deletion(-)
> 
> diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node
> index 3e90e1f3bf0a..a9c47b4b0eee 100644
> --- a/Documentation/ABI/stable/sysfs-devices-node
> +++ b/Documentation/ABI/stable/sysfs-devices-node
> @@ -90,4 +90,27 @@ Date:		December 2009
>  Contact:	Lee Schermerhorn <lee.schermerhorn@...com>
>  Description:
>  		The node's huge page size control/query attributes.
> -		See Documentation/admin-guide/mm/hugetlbpage.rst
> \ No newline at end of file
> +		See Documentation/admin-guide/mm/hugetlbpage.rst
> +
> +What:		/sys/devices/system/node/nodeX/classY/
> +Date:		December 2018
> +Contact:	Keith Busch <keith.busch@...el.com>
> +Description:
> +		The node's relationship to other nodes for access class "Y".
> +
> +What:		/sys/devices/system/node/nodeX/classY/initiator_nodelist
> +Date:		December 2018
> +Contact:	Keith Busch <keith.busch@...el.com>
> +Description:
> +		The node list of memory initiators that have class "Y" access
> +		to this node's memory. CPUs and other memory initiators in
> +		nodes not in the list accessing this node's memory may have
> +		different performance.
> +
> +What:		/sys/devices/system/node/nodeX/classY/target_nodelist
> +Date:		December 2018
> +Contact:	Keith Busch <keith.busch@...el.com>
> +Description:
> +		The node list of memory targets that this initiator node has
> +		class "Y" access. Memory accesses from this node to nodes not
> +		in this list may have differet performance.

Different performance from what?  In the other thread we established that
these target_nodelists are kind of a backwards reference, they all have
their characteristics anyway.  Perhaps this just needs to say:
"Memory access from this node to these targets may have different performance"?

i.e. Don't make the assumption I did that they should all be the same!