[PATCH v4 00/10] Add support for parameterized events from sysfs

From: Sukadev Bhattiprolu
Date: Wed Sep 24 2014 - 15:27:54 EST

What this patchset does:

- the first patch (override sysfs in tools/perf via SYSFS_PATH) was sent out
previously, but needed a resend anyhow. Having it is useful for testing the
later changes to tools/perf.
- the second patch is a bugfix to the powerpc hv-24x7 code which was
previously sent out, which is a good idea to have when testing these patches
on POWER8 hardware.

- document perf sysfs and the changes to add parameterized events
- semi-notably: removes the growing list of specific POWER cpu events and
begins documenting them generically, much like the docs for
/sys/modules/MODULENAME do for modules.
- tools/perf changes to support parameterized events
- export some parameterized events from the powerpc pmus hv_24x7 and hv_gpci

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):



In the case of the last example, a value replacing "phys_cpu"
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 (and how to use them,
again culled from an included patch):


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


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

perf stat -e 'hv_gpci/dtbp_ptitc,phys_processor_idx=0x2/' ...

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

- [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.
- [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 (10):
tools/perf: support parsing parameterized events
tools/perf: extend format_alias() to include event parameters
perf: provide sysfs_show for struct perf_pmu_events_attr
powerpc/perf/hv-24x7: parse catalog and populate sysfs with events
perf: add PMU_EVENT_ATTR_STRING() helper
powerpc/perf/{hv-gpci,hv-common}: generate requests with counters
powerpc/perf/hv-gpci: add the remaining gpci requests
perf Documentation: add event parameters
tools/perf: Document parameterized and symbolic events
powerpc/perf/hv-24x7: Document sysfs event description entries

.../testing/sysfs-bus-event_source-devices-events | 6 +
.../testing/sysfs-bus-event_source-devices-hv_24x7 | 22 +
arch/powerpc/perf/hv-24x7-catalog.h | 25 +
arch/powerpc/perf/hv-24x7-domains.h | 28 +
arch/powerpc/perf/hv-24x7.c | 787 ++++++++++++++++++++-
arch/powerpc/perf/hv-24x7.h | 12 +-
arch/powerpc/perf/hv-common.c | 10 +-
arch/powerpc/perf/hv-gpci-requests.h | 262 +++++++
arch/powerpc/perf/hv-gpci.c | 8 +
arch/powerpc/perf/hv-gpci.h | 37 +-
arch/powerpc/perf/req-gen/_begin.h | 13 +
arch/powerpc/perf/req-gen/_clear.h | 5 +
arch/powerpc/perf/req-gen/_end.h | 4 +
arch/powerpc/perf/req-gen/_request-begin.h | 15 +
arch/powerpc/perf/req-gen/_request-end.h | 8 +
arch/powerpc/perf/req-gen/perf.h | 155 ++++
include/linux/perf_event.h | 10 +
kernel/events/core.c | 8 +
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 | 91 ++-
23 files changed, 1492 insertions(+), 60 deletions(-)
create mode 100644 arch/powerpc/perf/hv-24x7-domains.h
create mode 100644 arch/powerpc/perf/hv-gpci-requests.h
create mode 100644 arch/powerpc/perf/req-gen/_begin.h
create mode 100644 arch/powerpc/perf/req-gen/_clear.h
create mode 100644 arch/powerpc/perf/req-gen/_end.h
create mode 100644 arch/powerpc/perf/req-gen/_request-begin.h
create mode 100644 arch/powerpc/perf/req-gen/_request-end.h
create mode 100644 arch/powerpc/perf/req-gen/perf.h


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