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 preceded 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. It is based on [1] and assumes this set [2] has been applied. I will be happy to merge the patchsets if it easier for maintainers to apply, simply let me know. Thanks, Mathieu Changes for V4: - Pushing PMU driver configuration for 'perf top'. - Rebased to the latest perf/core branch[1]. Changes for V3: - Added comment for function drv_str() that explains the reason for keeping the entire token intact. - Added driver config terms to the existing list of config terms. - Added documenation for driver specific configuration. - Pushing PMU driver configuration for 'perf stat' as well. - Preventing users from selecting a sink from sysFS _and_ perf. Changes for V2: - Rebased to [1] as per Jiri's request. [1]. git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core (c369e0a1a8fa) [2]. https://lkml.org/lkml/2016/7/20/519 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 | 43 +++++++--- 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/include/uapi/linux/perf_event.h | 1 + tools/perf/Documentation/perf-record.txt | 12 +++ tools/perf/builtin-record.c | 9 ++ tools/perf/builtin-stat.c | 8 ++ tools/perf/builtin-top.c | 11 +++ tools/perf/util/evlist.c | 21 +++++ tools/perf/util/evlist.h | 3 + tools/perf/util/evsel.c | 24 ++++++ tools/perf/util/evsel.h | 5 ++ tools/perf/util/parse-events.c | 7 +- tools/perf/util/parse-events.h | 1 + tools/perf/util/parse-events.l | 22 +++++ tools/perf/util/parse-events.y | 11 +++ 22 files changed, 301 insertions(+), 24 deletions(-) -- 2.7.4
