From: "Rafael J. Wysocki" <rafael@kernel.org>
To: Keith Busch <keith.busch@intel.com>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
ACPI Devel Maling List <linux-acpi@vger.kernel.org>,
Linux Memory Management List <linux-mm@kvack.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Rafael Wysocki <rafael@kernel.org>,
Dave Hansen <dave.hansen@intel.com>,
Dan Williams <dan.j.williams@intel.com>
Subject: Re: [PATCHv4 08/13] Documentation/ABI: Add node performance attributes
Date: Thu, 17 Jan 2019 16:09:32 +0100 [thread overview]
Message-ID: <CAJZ5v0iV8qt3_1BP_4fPN77CC7yLXT4QMW=q+jWdts+e5rf8dg@mail.gmail.com> (raw)
In-Reply-To: <20190116175804.30196-9-keith.busch@intel.com>
On Wed, Jan 16, 2019 at 6:59 PM Keith Busch <keith.busch@intel.com> wrote:
>
> Add descriptions for memory class initiator performance access attributes.
Again, I would combine this with the previous patch.
> Signed-off-by: Keith Busch <keith.busch@intel.com>
> ---
> Documentation/ABI/stable/sysfs-devices-node | 28 ++++++++++++++++++++++++++++
> 1 file changed, 28 insertions(+)
>
> diff --git a/Documentation/ABI/stable/sysfs-devices-node b/Documentation/ABI/stable/sysfs-devices-node
> index a9c47b4b0eee..2217557f29d3 100644
> --- a/Documentation/ABI/stable/sysfs-devices-node
> +++ b/Documentation/ABI/stable/sysfs-devices-node
> @@ -114,3 +114,31 @@ 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.
> +
> +What: /sys/devices/system/node/nodeX/classY/read_bandwidth
> +Date: December 2018
> +Contact: Keith Busch <keith.busch@intel.com>
> +Description:
> + This node's read bandwidth in MB/s available to memory
> + initiators in nodes found in this class's initiators_nodelist.
> +
> +What: /sys/devices/system/node/nodeX/classY/read_latency
> +Date: December 2018
> +Contact: Keith Busch <keith.busch@intel.com>
> +Description:
> + This node's read latency in nanoseconds available to memory
> + initiators in nodes found in this class's initiators_nodelist.
I'm not sure if the term "read latency" is sufficient here. Is this
the latency between sending a request and getting a response or
between sending the request and when the data actually becomes
available?
Moreover, is it the worst-case latency or the average latency?
> +
> +What: /sys/devices/system/node/nodeX/classY/write_bandwidth
> +Date: December 2018
> +Contact: Keith Busch <keith.busch@intel.com>
> +Description:
> + This node's write bandwidth in MB/s available to memory
> + initiators in nodes found in this class's initiators_nodelist.
> +
> +What: /sys/devices/system/node/nodeX/classY/write_latency
> +Date: December 2018
> +Contact: Keith Busch <keith.busch@intel.com>
> +Description:
> + This node's write latency in nanoseconds available to memory
> + initiators in nodes found in this class's initiators_nodelist.
> --
Same questions as for the read latency apply here.
next prev parent reply other threads:[~2019-01-17 15:09 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-16 17:57 [PATCHv4 00/13] Heterogeneuos memory node attributes Keith Busch
2019-01-16 17:57 ` [PATCHv4 01/13] acpi: Create subtable parsing infrastructure Keith Busch
2019-01-16 17:57 ` [PATCHv4 02/13] acpi: Add HMAT to generic parsing tables Keith Busch
2019-01-16 17:57 ` [PATCHv4 03/13] acpi/hmat: Parse and report heterogeneous memory Keith Busch
2019-01-17 11:00 ` Rafael J. Wysocki
2019-01-16 17:57 ` [PATCHv4 04/13] node: Link memory nodes to their compute nodes Keith Busch
2019-01-17 11:26 ` Rafael J. Wysocki
2019-01-16 17:57 ` [PATCHv4 05/13] Documentation/ABI: Add new node sysfs attributes Keith Busch
2019-01-17 11:41 ` Rafael J. Wysocki
2019-01-18 20:42 ` Keith Busch
2019-01-18 21:08 ` Dan Williams
2019-01-19 9:01 ` Greg Kroah-Hartman
2019-01-19 16:56 ` Dan Williams
2019-01-20 16:19 ` Rafael J. Wysocki
2019-01-20 17:34 ` Dan Williams
2019-01-21 9:54 ` Rafael J. Wysocki
2019-01-20 16:16 ` Rafael J. Wysocki
2019-01-22 16:36 ` Keith Busch
2019-01-22 16:51 ` Rafael J. Wysocki
2019-01-22 16:54 ` Rafael J. Wysocki
2019-01-18 11:21 ` Jonathan Cameron
2019-01-18 16:35 ` Dan Williams
2019-01-16 17:57 ` [PATCHv4 06/13] acpi/hmat: Register processor domain to its memory Keith Busch
2019-01-17 12:11 ` Rafael J. Wysocki
2019-01-17 17:01 ` Dan Williams
2019-01-16 17:57 ` [PATCHv4 07/13] node: Add heterogenous memory access attributes Keith Busch
2019-01-17 15:03 ` Rafael J. Wysocki
2019-01-17 15:41 ` Greg Kroah-Hartman
2019-01-16 17:57 ` [PATCHv4 08/13] Documentation/ABI: Add node performance attributes Keith Busch
2019-01-17 15:09 ` Rafael J. Wysocki [this message]
2019-01-16 17:58 ` [PATCHv4 09/13] acpi/hmat: Register " Keith Busch
2019-01-17 15:21 ` Rafael J. Wysocki
2019-01-16 17:58 ` [PATCHv4 10/13] node: Add memory caching attributes Keith Busch
2019-01-17 16:00 ` Rafael J. Wysocki
2019-02-09 8:20 ` Brice Goglin
2019-02-10 17:19 ` Jonathan Cameron
2019-02-11 15:23 ` Keith Busch
2019-02-12 8:11 ` Brice Goglin
2019-02-12 8:49 ` Jonathan Cameron
2019-02-12 17:31 ` Keith Busch
2019-01-16 17:58 ` [PATCHv4 11/13] Documentation/ABI: Add node cache attributes Keith Busch
2019-01-17 16:25 ` Rafael J. Wysocki
2019-01-16 17:58 ` [PATCHv4 12/13] acpi/hmat: Register memory side " Keith Busch
2019-01-17 17:42 ` Rafael J. Wysocki
2019-01-16 17:58 ` [PATCHv4 13/13] doc/mm: New documentation for memory performance Keith Busch
2019-01-17 12:58 ` [PATCHv4 00/13] Heterogeneuos memory node attributes Balbir Singh
2019-01-17 15:44 ` Keith Busch
2019-01-18 13:16 ` Balbir Singh
2019-01-17 18:18 ` Jonathan Cameron
2019-01-17 19:47 ` Keith Busch
2019-01-18 11:12 ` Jonathan Cameron
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