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authorTom Zanussi <tom.zanussi@linux.intel.com>2018-01-15 20:52:00 -0600
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-03-10 16:05:59 -0500
commitc282a386a39771588fe4cfdc01bbb8a255092e38 (patch)
tree9080cc188e40f7fdc6a9e65f573ef3f3e14c57bf /tools/perf/scripts/python/export-to-postgresql.py
parent02205a6752f223779a1b0e9e8ffacbea6e717851 (diff)
tracing: Add 'onmatch' hist trigger action support
Add an 'onmatch(matching.event).<synthetic_event_name>(param list)' hist trigger action which is invoked with the set of variables or event fields named in the 'param list'. The result is the generation of a synthetic event that consists of the values contained in those variables and/or fields at the time the invoking event was hit. As an example the below defines a simple synthetic event using a variable defined on the sched_wakeup_new event, and shows the event definition with unresolved fields, since the sched_wakeup_new event with the testpid variable hasn't been defined yet: # echo 'wakeup_new_test pid_t pid; int prio' >> \ /sys/kernel/debug/tracing/synthetic_events # cat /sys/kernel/debug/tracing/synthetic_events wakeup_new_test pid_t pid; int prio The following hist trigger both defines a testpid variable and specifies an onmatch() trace action that uses that variable along with a non-variable field to generate a wakeup_new_test synthetic event whenever a sched_wakeup_new event occurs, which because of the 'if comm == "cyclictest"' filter only happens when the executable is cyclictest: # echo 'hist:testpid=pid:keys=$testpid:\ onmatch(sched.sched_wakeup_new).wakeup_new_test($testpid, prio) \ if comm=="cyclictest"' >> \ /sys/kernel/debug/tracing/events/sched/sched_wakeup_new/trigger Creating and displaying a histogram based on those events is now just a matter of using the fields and new synthetic event in the tracing/events/synthetic directory, as usual: # echo 'hist:keys=pid,prio:sort=pid,prio' >> \ /sys/kernel/debug/tracing/events/synthetic/wakeup_new_test/trigger Link: http://lkml.kernel.org/r/8c2a574bcb7530c876629c901ecd23911b14afe8.1516069914.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Rajvi Jingar <rajvi.jingar@intel.com> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
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