2013-07-15 21:56:14

by Vince Weaver

Subject: perf documentation: update Documentation/ABI/testing with missing perf-related files

Add documentation for various files perf_event creates under
/sys/bus/event_source/devices/<dev>/

Signed-off-by: Vince Weaver <[email protected]>

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices b/Documentation/ABI/testing/sysfs-bus-event_source-devices
new file mode 100644
index 0000000..ffa2e4b
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices
@@ -0,0 +1,50 @@
+What: /sys/bus/event_source/devices/<dev>/cpumask
+
+Date: 2012/09/10
+
+Contact: Linux kernel mailing list <[email protected]>
+
+Description: This value holds a representative core for each
+ socket in a system. It is meant to help when
+ creating a perf_event event for socket-wide events
+ like uncore and northbridge events.
+
+ The format is a comma separated list of cpu numbers,
+ one for each socket in the system that the PMU in
+ question can run on.
+
+ For example, on a two-socket Sandybridge-EP machine and
+ the cbox0 uncore the value of the file will be:
+ 0,8
+
+
+
+What: /sys/bus/event_source/devices/cpu/rdpmc
+
+Date: 2011/11/20
+
+Contact: Linux kernel mailing list <[email protected]>
+
+Description: Indicates whether a CPU allows userspace "rdpmc"
+ instructions (unprivileged reads of the performance
+ counter MSRs).
+
+ You can echo 0 to this value to disable user rdpmc
+ access.
+
+
+
+What: /sys/bus/event_source/devices/<dev>/type
+
+Date: 2013/01/08
+
+Contact: Linux kernel mailing list <[email protected]>
+
+Description: This value holds the PMU (Performance Monitor Unit) type
+ value that is passed into the perf_event_open()
+ attr:type field when opening an event.
+
+ The value is a decimal integer.
+
+
+

2013-07-16 08:36:27

by Jiri Olsa

Subject: Re: perf documentation: update Documentation/ABI/testing with missing perf-related files

On Mon, Jul 15, 2013 at 05:38:15PM -0400, Vince Weaver wrote:
>
> Add documentation for various files perf_event creates under
> /sys/bus/event_source/devices/<dev>/
>
> Signed-off-by: Vince Weaver <[email protected]>
>
> diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices b/Documentation/ABI/testing/sysfs-bus-event_source-devices
> new file mode 100644
> index 0000000..ffa2e4b
> --- /dev/null
> +++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices
> @@ -0,0 +1,50 @@
> +What: /sys/bus/event_source/devices/<dev>/cpumask
> +
> +Date: 2012/09/10
> +

nit, white space above

> +Contact: Linux kernel mailing list <[email protected]>
> +
> +Description: This value holds a representative core for each
> + socket in a system. It is meant to help when
> + creating a perf_event event for socket-wide events
> + like uncore and northbridge events.
> +
> + The format is a comma separated list of cpu numbers,
> + one for each socket in the system that the PMU in
> + question can run on.
> +
> + For example, on a two-socket Sandybridge-EP machine and
> + the cbox0 uncore the value of the file will be:
> + 0,8
> +

nit, white space above

> +
> +
> +What: /sys/bus/event_source/devices/cpu/rdpmc
> +
> +Date: 2011/11/20
> +
> +Contact: Linux kernel mailing list <[email protected]>
> +
> +Description: Indicates whether a CPU allows userspace "rdpmc"
> + instructions (unprivileged reads of the performance
> + counter MSRs).
> +
> + You can echo 0 to this value to disable user rdpmc
> + access.
> +
> +
> +
> +What: /sys/bus/event_source/devices/<dev>/type
> +
> +Date: 2013/01/08
> +
> +Contact: Linux kernel mailing list <[email protected]>
> +
> +Description: This value holds the PMU (Performance Monitor Unit) type
> + value that is passed into the perf_event_open()
> + attr:type field when opening an event.
> +
> + The value is a decimal integer.
> +
> +
> +

Acked-by: Jiri Olsa <[email protected]>

thanks,
jirka