1What:		/sys/devices/cpu/events/
2		/sys/devices/cpu/events/branch-misses
3		/sys/devices/cpu/events/cache-references
4		/sys/devices/cpu/events/cache-misses
5		/sys/devices/cpu/events/stalled-cycles-frontend
6		/sys/devices/cpu/events/branch-instructions
7		/sys/devices/cpu/events/stalled-cycles-backend
8		/sys/devices/cpu/events/instructions
9		/sys/devices/cpu/events/cpu-cycles
10
11Date:		2013/01/08
12
13Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
14
15Description:	Generic performance monitoring events
16
17		A collection of performance monitoring events that may be
18		supported by many/most CPUs. These events can be monitored
19		using the 'perf(1)' tool.
20
21		The contents of each file would look like:
22
23			event=0xNNNN
24
25		where 'N' is a hex digit and the number '0xNNNN' shows the
26		"raw code" for the perf event identified by the file's
27		"basename".
28
29
30What: /sys/bus/event_source/devices/<pmu>/events/<event>
31Date: 2014/02/24
32Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
33Description:	Per-pmu performance monitoring events specific to the running system
34
35		Each file (except for some of those with a '.' in them, '.unit'
36		and '.scale') in the 'events' directory describes a single
37		performance monitoring event supported by the <pmu>. The name
38		of the file is the name of the event.
39
40		File contents:
41
42			<term>[=<value>][,<term>[=<value>]]...
43
44		Where <term> is one of the terms listed under
45		/sys/bus/event_source/devices/<pmu>/format/ and <value> is
46		a number is base-16 format with a '0x' prefix (lowercase only).
47		If a <term> is specified alone (without an assigned value), it
48		is implied that 0x1 is assigned to that <term>.
49
50		Examples (each of these lines would be in a seperate file):
51
52			event=0x2abc
53			event=0x423,inv,cmask=0x3
54			domain=0x1,offset=0x8,starting_index=0xffff
55			domain=0x1,offset=0x8,core=?
56
57		Each of the assignments indicates a value to be assigned to a
58		particular set of bits (as defined by the format file
59		corresponding to the <term>) in the perf_event structure passed
60		to the perf_open syscall.
61
62		In the case of the last example, a value replacing "?" would
63		need to be provided by the user selecting the particular event.
64		This is referred to as "event parameterization". Event
65		parameters have the format 'param=?'.
66
67What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit
68Date: 2014/02/24
69Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
70Description:	Perf event units
71
72		A string specifying the English plural numerical unit that <event>
73		(once multiplied by <event>.scale) represents.
74
75		Example:
76
77			Joules
78
79What: /sys/bus/event_source/devices/<pmu>/events/<event>.scale
80Date: 2014/02/24
81Contact:	Linux kernel mailing list <linux-kernel@vger.kernel.org>
82Description:	Perf event scaling factors
83
84		A string representing a floating point value expressed in
85		scientific notation to be multiplied by the event count
86		recieved from the kernel to match the unit specified in the
87		<event>.unit file.
88
89		Example:
90
91			2.3283064365386962890625e-10
92
93		This is provided to avoid performing floating point arithmetic
94		in the kernel.
95