1 What: /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
13 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
15 Description: Generic performance monitoring events
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.
21 The contents of each file would look like:
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
30 What: /sys/bus/event_source/devices/<pmu>/events/<event>
32 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
33 Description: Per-pmu performance monitoring events specific to the running system
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.
42 <term>[=<value>][,<term>[=<value>]]...
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>.
50 Examples (each of these lines would be in a seperate file):
53 event=0x423,inv,cmask=0x3
54 domain=0x1,offset=0x8,starting_index=0xffff
56 Each of the assignments indicates a value to be assigned to a
57 particular set of bits (as defined by the format file
58 corresponding to the <term>) in the perf_event structure passed
59 to the perf_open syscall.
61 What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit
63 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
64 Description: Perf event units
66 A string specifying the English plural numerical unit that <event>
67 (once multiplied by <event>.scale) represents.
73 What: /sys/bus/event_source/devices/<pmu>/events/<event>.scale
75 Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
76 Description: Perf event scaling factors
78 A string representing a floating point value expressed in
79 scientific notation to be multiplied by the event count
80 recieved from the kernel to match the unit specified in the
85 2.3283064365386962890625e-10
87 This is provided to avoid performing floating point arithmetic