linux-kernel - perf documentation: update format and events ABI files

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Message-ID: <alpine.DEB.2.10.1307151656050.6555@vincent-weaver-1.um.maine.edu>
Date:	Mon, 15 Jul 2013 17:04:50 -0400 (EDT)
From:	Vince Weaver <vincent.weaver@...ne.edu>
To:	linux-kernel@...r.kernel.org
cc:	Jiri Olsa <jolsa@...hat.com>, linux-perf-users@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>, mingo@...nel.org,
	acme@...hat.com, Stephane Eranian <eranian@...il.com>
Subject: perf documentation: update format and events ABI files


This updates the sysfs-bus-event_source-devices-events and
sysfs-bus-event_source-devices-format Documentation to more
closely match the values current kernels are exporting.

The big change is the allowing of decimal values in the events file;
this was an ABI change in the 3.10 kernel.

It also documents more completely how non-contiguous values work in the 
format file.  I have to say it would have been much easier for parser 
writers if the format value had been a simple mask rather than having to 
take a value, parse it, and then do an arbitracy number of shift/masks
to split up the value to pass in.

Signed-off-by: Vince Weaver <vincent.weaver@...ne.edu>

diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
index 3c1cc24..43aae08 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-events
@@ -1,30 +1,51 @@
-What:		/sys/devices/cpu/events/
+What:		/sys/bus/event_source/devices/<dev>/events
+
+Date:		2013/01/08
+
+Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
+
+Description:	Generic performance monitoring events
+
+		A collection of performance monitoring events that are
+		supported by the PMU (performance monitoring unit)
+		specified by "<dev>". These events can be monitored
+		using the 'perf(1)' tool.
+
+		The contents of each file is a list of attribute names
+		(as found in the corresponding
+			/sys/bus/event_source/devices/<dev>/format
+		file) separated by commas.  Each entry has
+		an optional value (either hex or decimal).  If no
+		value is specified than it is assumed to be a single-bit
+		field with a value of 1.
+
+		An example of what you might find:
+			event=0x2,inv,ldlat=3
+
+
+What:		/sys/devices/cpu/events/branch-instructions
 		/sys/devices/cpu/events/branch-misses
-		/sys/devices/cpu/events/cache-references
+		/sys/devices/cpu/events/bus-cycles
 		/sys/devices/cpu/events/cache-misses
-		/sys/devices/cpu/events/stalled-cycles-frontend
-		/sys/devices/cpu/events/branch-instructions
-		/sys/devices/cpu/events/stalled-cycles-backend
-		/sys/devices/cpu/events/instructions
+		/sys/devices/cpu/events/cache-references
 		/sys/devices/cpu/events/cpu-cycles
+		/sys/devices/cpu/events/instructions
+		/sys/devices/cpu/events/stalled-cycles-backend
+		/sys/devices/cpu/events/stalled-cycles-frontend
 
 Date:		2013/01/08
 
 Contact:	Linux kernel mailing list <linux-kernel@...r.kernel.org>
 
-Description:	Generic performance monitoring events
+Description:	Generic CPU performance monitoring events
 
 		A collection of performance monitoring events that may be
 		supported by many/most CPUs. These events can be monitored
 		using the 'perf(1)' tool.
 
-		The contents of each file would look like:
-
-			event=0xNNNN
-
-		where 'N' is a hex digit and the number '0xNNNN' shows the
-		"raw code" for the perf event identified by the file's
-		"basename".
+		The format of these files matches that of
+		/sys/bus/event_source/devices/<dev>/events as described
+		previously in this file.
 
 
 What: 		/sys/devices/cpu/events/PM_1PLUS_PPC_CMPL
diff --git a/Documentation/ABI/testing/sysfs-bus-event_source-devices-format b/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
index 77f47ff..4f7ee5e 100644
--- a/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
+++ b/Documentation/ABI/testing/sysfs-bus-event_source-devices-format
@@ -15,6 +15,12 @@ Description:
 			attr2 = 'config:0-7'
 			attr3 = 'config:12-35'
 
-		Example: 'config1:1,6-10,44'
+		Example: event = 'config1:1,6-10,44'
 		Defines contents of attribute that occupies bits 1,6-10,44 of
 		perf_event_attr::config1.
+
+		In this example, the events file would have the value 
+			event=0x7f
+		to set all of the specified bits (they will be split up).
+		You would not use 0x10000007c2 (which is what the bits
+		actually passed into config1 would look like).
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