diff options
| -rw-r--r-- | tools/perf/Documentation/perf-top.txt | 38 | ||||
| -rw-r--r-- | tools/perf/builtin-top.c | 10 | ||||
| -rw-r--r-- | tools/perf/util/top.h | 2 |
3 files changed, 49 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-top.txt b/tools/perf/Documentation/perf-top.txt index cfea87c6f38e..5596129a71cf 100644 --- a/tools/perf/Documentation/perf-top.txt +++ b/tools/perf/Documentation/perf-top.txt @@ -266,6 +266,44 @@ Default is to monitor all CPUS. Record events of type PERF_RECORD_NAMESPACES and display it with the 'cgroup_id' sort key. +--switch-on EVENT_NAME:: + Only consider events after this event is found. + + E.g.: + + Find out where broadcast packets are handled + + perf probe -L icmp_rcv + + Insert a probe there: + + perf probe icmp_rcv:59 + + Start perf top and ask it to only consider the cycles events when a + broadcast packet arrives This will show a menu with two entries and + will start counting when a broadcast packet arrives: + + perf top -e cycles,probe:icmp_rcv --switch-on=probe:icmp_rcv + + Alternatively one can ask for --group and then two overhead columns + will appear, the first for cycles and the second for the switch-on event. + + perf top --group -e cycles,probe:icmp_rcv --switch-on=probe:icmp_rcv + + This may be interesting to measure a workload only after some initialization + phase is over, i.e. insert a perf probe at that point and use the above + examples replacing probe:icmp_rcv with the just-after-init probe. + +--switch-off EVENT_NAME:: + Stop considering events after this event is found. + +--show-on-off-events:: + Show the --switch-on/off events too. This has no effect in 'perf top' now + but probably we'll make the default not to show the switch-on/off events + on the --group mode and if there is only one event besides the off/on ones, + go straight to the histogram browser, just like 'perf top' with no events + explicitely specified does. + INTERACTIVE PROMPTING KEYS -------------------------- diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c index 78e7efc597a6..5970723cd55a 100644 --- a/tools/perf/builtin-top.c +++ b/tools/perf/builtin-top.c @@ -1148,8 +1148,11 @@ static int deliver_event(struct ordered_events *qe, evsel = perf_evlist__id2evsel(session->evlist, sample.id); assert(evsel != NULL); - if (event->header.type == PERF_RECORD_SAMPLE) + if (event->header.type == PERF_RECORD_SAMPLE) { + if (evswitch__discard(&top->evswitch, evsel)) + return 0; ++top->samples; + } switch (sample.cpumode) { case PERF_RECORD_MISC_USER: @@ -1534,6 +1537,7 @@ int cmd_top(int argc, const char **argv) "number of thread to run event synthesize"), OPT_BOOLEAN(0, "namespaces", &opts->record_namespaces, "Record namespaces events"), + OPTS_EVSWITCH(&top.evswitch), OPT_END() }; struct evlist *sb_evlist = NULL; @@ -1567,6 +1571,10 @@ int cmd_top(int argc, const char **argv) goto out_delete_evlist; } + status = evswitch__init(&top.evswitch, top.evlist, stderr); + if (status) + goto out_delete_evlist; + if (symbol_conf.report_hierarchy) { /* disable incompatible options */ symbol_conf.event_group = false; diff --git a/tools/perf/util/top.h b/tools/perf/util/top.h index 2023e0bf6165..dc4bb6e52a83 100644 --- a/tools/perf/util/top.h +++ b/tools/perf/util/top.h @@ -3,6 +3,7 @@ #define __PERF_TOP_H 1 #include "tool.h" +#include "evswitch.h" #include "annotate.h" #include <linux/types.h> #include <stddef.h> @@ -18,6 +19,7 @@ struct perf_top { struct evlist *evlist; struct record_opts record_opts; struct annotation_options annotation_opts; + struct evswitch evswitch; /* * Symbols will be added here in perf_event__process_sample and will * get out after decayed. |