Messages in this thread | | | From | Sukadev Bhattiprolu <> | Subject | [PATCH v7 0/4] Add support for parametrized events | Date | Mon, 26 Jan 2015 17:43:03 -0800 |
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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,core=?
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".
Notes on how perf-list displays parameterized events
PARAMETERIZED EVENTS --------------------
Some pmu events listed by 'perf list' will be displayed with '=?' in them. For example:
hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,core=?/
This means that when provided as an event, a value for ? must also be supplied. For example:
perf stat -e \ 'hv_24x7/HPM_THREAD_NAP_CCYC__PHYS_CORE,core=2' ...
Cody P Schafer (6): perf: provide sysfs_show for struct perf_pmu_events_attr perf: add PMU_EVENT_ATTR_STRING() helper powerpc/perf/hv-24x7: parse catalog and populate sysfs with events powerpc/perf/{hv-gpci, hv-common}: generate requests with counters annotated powerpc/perf/hv-gpci: add the remaining gpci requests powerpc/perf/hv-24x7: Document sysfs event description entries
Sukadev Bhattiprolu (1): perf: define EVENT_DEFINE_RANGE_FORMAT_LITE helper
.../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 | 793 ++++++++++++++++++++- arch/powerpc/perf/hv-24x7.h | 12 +- arch/powerpc/perf/hv-common.c | 10 +- arch/powerpc/perf/hv-common.h | 10 + arch/powerpc/perf/hv-gpci-requests.h | 261 +++++++ arch/powerpc/perf/hv-gpci.c | 23 + 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 | 12 + 18 files changed, 1396 insertions(+), 47 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
-- 1.8.3.1
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