Messages in this thread | | | From | Mathieu Poirier <> | Subject | [PATCH 0/6] perf: Driver specific configuration for PMU | Date | Tue, 19 Jul 2016 16:53:50 -0600 |
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This patchset adds the possiblity of specifying PMU driver configuration directly from the perf command line. Anything that falls within the event specifiers '/.../' and that is preceeded by the '@' symbol is treated as a configurable. Two formats are supported, @cfg and @cfg=config.
For example:
perf record -e some_event/@cfg1/ ...
or
perf record -e some_event/@cfg2=config/ ...
or
perf record -e some_event/@cfg1,@cfg2=config/ ...
The above are all valid configuration and will see the strings 'cfg1' and 'cfg2=config' sent to the PMU driver for parsing and interpretation using the existing ioctl() mechanism.
The primary customers for this feature are the CoreSight drivers where the selection of a sink (where trace data is accumulated) needs to be done in a previous, and separated step, from the launching of the perf command.
As such something that used to be a two-step process:
# echo 1 > /sys/bus/coresight/devices/20070000.etr/enable_sink # perf record -e cs_etm//u --per-thread uname
is integrated in a single command:
# perf record -e cs_etm/@sink=20070000.etr/u --per-thread uname
The patches include both the kernel and user space part so that the solution is complete and found in a single place.
Last but not least it is based on 4.7-rc7 assumes that these patches [1] have been applied.
Thanks, Mathieu
[1]. https://lkml.org/lkml/2016/7/14/642
Mathieu Poirier (6): perf/core: Adding PMU driver specific configuration perf: Passing struct perf_event to function setup_aux() perf tools: add infrastructure for PMU specific configuration perf tools: pushing driver configuration down to the kernel coresight: adding sink parameter to function coresight_build_path() coresight: etm-perf: incorporating sink definition from cmd line
arch/x86/events/intel/bts.c | 4 +- arch/x86/events/intel/pt.c | 5 +- drivers/hwtracing/coresight/coresight-etm-perf.c | 105 ++++++++++++++++++++++- drivers/hwtracing/coresight/coresight-priv.h | 3 +- drivers/hwtracing/coresight/coresight.c | 40 ++++++--- include/linux/perf_event.h | 11 ++- include/uapi/linux/perf_event.h | 1 + kernel/events/core.c | 16 ++++ kernel/events/ring_buffer.c | 2 +- tools/perf/builtin-record.c | 9 ++ tools/perf/util/evlist.c | 24 ++++++ tools/perf/util/evlist.h | 3 + tools/perf/util/evsel.c | 33 +++++++ tools/perf/util/evsel.h | 7 ++ tools/perf/util/parse-events.c | 67 +++++++++++---- tools/perf/util/parse-events.h | 1 + tools/perf/util/parse-events.l | 12 +++ tools/perf/util/parse-events.y | 11 +++ 18 files changed, 314 insertions(+), 40 deletions(-)
-- 2.7.4
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