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Diffstat (limited to 'kernel/Documentation/ABI/testing/sysfs-bus-event_source-devices-events')
| -rw-r--r-- | kernel/Documentation/ABI/testing/sysfs-bus-event_source-devices-events | 94 |
1 files changed, 94 insertions, 0 deletions
diff --git a/kernel/Documentation/ABI/testing/sysfs-bus-event_source-devices-events b/kernel/Documentation/ABI/testing/sysfs-bus-event_source-devices-events new file mode 100644 index 000000000..505f080d2 --- /dev/null +++ b/kernel/Documentation/ABI/testing/sysfs-bus-event_source-devices-events @@ -0,0 +1,94 @@ +What: /sys/devices/cpu/events/ + /sys/devices/cpu/events/branch-misses + /sys/devices/cpu/events/cache-references + /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/cpu-cycles + +Date: 2013/01/08 + +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> + +Description: Generic 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". + + +What: /sys/bus/event_source/devices/<pmu>/events/<event> +Date: 2014/02/24 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> +Description: Per-pmu performance monitoring events specific to the running system + + Each file (except for some of those with a '.' in them, '.unit' + and '.scale') in the 'events' directory describes a single + performance monitoring event supported by the <pmu>. The name + of the file is the name of the event. + + File contents: + + <term>[=<value>][,<term>[=<value>]]... + + Where <term> is one of the terms listed under + /sys/bus/event_source/devices/<pmu>/format/ and <value> is + a number is base-16 format with a '0x' prefix (lowercase only). + If a <term> is specified alone (without an assigned value), it + is implied that 0x1 is assigned to that <term>. + + Examples (each of these lines would be in a seperate file): + + event=0x2abc + event=0x423,inv,cmask=0x3 + domain=0x1,offset=0x8,starting_index=0xffff + domain=0x1,offset=0x8,core=? + + Each of the assignments indicates a value to be assigned to a + particular set of bits (as defined by the format file + corresponding to the <term>) in the perf_event structure passed + to the perf_open syscall. + + In the case of the last example, a value replacing "?" would + need to be provided by the user selecting the particular event. + This is referred to as "event parameterization". Event + parameters have the format 'param=?'. + +What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit +Date: 2014/02/24 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> +Description: Perf event units + + A string specifying the English plural numerical unit that <event> + (once multiplied by <event>.scale) represents. + + Example: + + Joules + +What: /sys/bus/event_source/devices/<pmu>/events/<event>.scale +Date: 2014/02/24 +Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org> +Description: Perf event scaling factors + + A string representing a floating point value expressed in + scientific notation to be multiplied by the event count + recieved from the kernel to match the unit specified in the + <event>.unit file. + + Example: + + 2.3283064365386962890625e-10 + + This is provided to avoid performing floating point arithmetic + in the kernel. |