[PATCH v5 0/4] Add support for parametrized events

From: Sukadev Bhattiprolu
Date: Tue Dec 02 2014 - 21:10:07 EST


Description of "event parameters" from the documentation patch:

Event parameters are a basic way for partial events to be specified in
sysfs with per-event names given to the fields that need to be filled in
when using a particular event.

It is intended for supporting cases where the single 'cpu' parameter is
insufficient. For example, POWER 8 has events for physical
sockets/cores/cpus that are accessible from with virtual machines. To
keep using the single 'cpu' parameter we'd need to perform a mapping
between Linux's cpus and the physical machine's cpus (in this case
Linux is running under a hypervisor). This isn't possible because
bindings between our cpus and physical cpus may not be fixed, and we
probably won't have a "cpu" on each physical cpu.

Description of the sysfs contents when events are parameterized (copied from an
included patch):

Examples:

domain=0x1,offset=0x8,starting_index=$core

In the case of the last example, a value replacing "$core" would need
to be provided by the user selecting the particular event. This is
refered to as "event parameterization". All non-numerical values
indicate an event parameter.

Notes on how perf-list displays parameterized events

PARAMETERIZED EVENTS
--------------------

Some pmu events listed by 'perf list' will be displayed with '$xyz' in
them. For example:

hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,starting_index=$core/

This means that when provided as an event, a value for $core must also
be supplied. For example:

perf stat -e \
'hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,starting_index=2'
...

Changelog[v5]
- [Jiri Olsa, Peter Zijlstra] Use '$arg' notation rather than ?
to indicate event parameters.

- [Michael Ellerman] Separate the kernel and tool patches in the
patchset into different patchsets.

Changelog[v4]
- [Jiri Olsa] Rebase to perf/core tree (fix small merge conflict)

Changelog[v3]
- [Jiri Olsa] Changed the event parameters are specified. If
event file specifes 'param=val' make the usage 'param=123'
rather than 'val=123'. (patch 1,2/10)
- Shortened event names using "PHYS" and "VCPU" (patch 4/10)
- Print help message if invalid parameter is specified or required
parameter is missing.
- Moved 3 patches that are unrelated to parametrized events into
a separate patchset.
- Reordered patches so code changes come first.

Changelog[v2]
- [Joe Perches, David Laight] Use beNN_to_cpu() instead of guessing
the size from type.
- Use kmem_cache_free() to free page allocated with kmem_cache_alloc().
- Rebase to recent kernel


Cody P Schafer (4):
tools/perf: support parsing parameterized events
tools/perf: extend format_alias() to include event parameters
perf Documentation: add event parameters
tools/perf: Document parameterized and symbolic events

.../testing/sysfs-bus-event_source-devices-events | 6 ++
tools/perf/Documentation/perf-list.txt | 13 +++
tools/perf/Documentation/perf-record.txt | 12 +++
tools/perf/Documentation/perf-stat.txt | 20 ++++-
tools/perf/util/parse-events.h | 1 +
tools/perf/util/pmu.c | 92 +++++++++++++++++++---
6 files changed, 128 insertions(+), 16 deletions(-)

--
1.8.3.1

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