perf Documentation: sysfs events/ interfaces
Add documentation for the <event>, <event>.scale, and <event>.unit files in sysfs. <event>.scale and <event>.unit were undocumented. <event> was previously documented only for specific powerpc pmu events. Signed-off-by: Cody P Schafer <dev@codyps.com> Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Anshuman Khandual <khandual@linux.vnet.ibm.com> Cc: Cody P Schafer <dev@codyps.com> Cc: Haren Myneni <hbabu@us.ibm.com> Cc: Haren Myneni <hbabu@us.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Michael Ellerman <michaele@au1.ibm.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/1412143402-26061-4-git-send-email-sukadev@linux.vnet.ibm.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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@ -599,3 +599,63 @@ Description: POWER-systems specific performance monitoring events
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Further, multiple terms like 'event=0xNNNN' can be specified
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and separated with comma. All available terms are defined in
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the /sys/bus/event_source/devices/<dev>/format file.
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What: /sys/bus/event_source/devices/<pmu>/events/<event>
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Date: 2014/02/24
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description: Per-pmu performance monitoring events specific to the running system
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Each file (except for some of those with a '.' in them, '.unit'
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and '.scale') in the 'events' directory describes a single
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performance monitoring event supported by the <pmu>. The name
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of the file is the name of the event.
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File contents:
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<term>[=<value>][,<term>[=<value>]]...
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Where <term> is one of the terms listed under
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/sys/bus/event_source/devices/<pmu>/format/ and <value> is
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a number is base-16 format with a '0x' prefix (lowercase only).
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If a <term> is specified alone (without an assigned value), it
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is implied that 0x1 is assigned to that <term>.
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Examples (each of these lines would be in a seperate file):
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event=0x2abc
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event=0x423,inv,cmask=0x3
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domain=0x1,offset=0x8,starting_index=0xffff
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Each of the assignments indicates a value to be assigned to a
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particular set of bits (as defined by the format file
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corresponding to the <term>) in the perf_event structure passed
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to the perf_open syscall.
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What: /sys/bus/event_source/devices/<pmu>/events/<event>.unit
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Date: 2014/02/24
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description: Perf event units
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A string specifying the English plural numerical unit that <event>
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(once multiplied by <event>.scale) represents.
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Example:
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Joules
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What: /sys/bus/event_source/devices/<pmu>/events/<event>.scale
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Date: 2014/02/24
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Contact: Linux kernel mailing list <linux-kernel@vger.kernel.org>
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Description: Perf event scaling factors
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A string representing a floating point value expressed in
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scientific notation to be multiplied by the event count
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recieved from the kernel to match the unit specified in the
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<event>.unit file.
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Example:
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2.3283064365386962890625e-10
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This is provided to avoid performing floating point arithmetic
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in the kernel.
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