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authorJiri Olsa <jolsa@redhat.com>2012-11-12 18:34:01 +0100
committerArnaldo Carvalho de Melo <acme@redhat.com>2012-11-14 16:52:03 -0300
commit774cb499ca9ab0e5950a149d1fe102b125da1cee (patch)
tree4beed0b9979eaeca8ec79f67b36e02fedd5eed5a /tools
parentcac21425578abddc4e9f529845832a57ba27ce0f (diff)
downloadlinux-774cb499ca9ab0e5950a149d1fe102b125da1cee.tar.gz
perf tools: Fix 'disabled' attribute config for record command
Currently the record command sets all events initially as disabled. There's non conditional perf_evlist__enable call, that enables all events before we exec tracee program. That actually screws whole enable_on_exec logic, because the event is enabled before the traced program got executed. What we actually want is: 1) For any type of traced program: - all independent events and group leaders are disabled - all group members are enabled Group members are ruled by group leaders. They need to be enabled, because the group scheduling relies on that. 2) For traced programs executed by perf: - all independent events and group leaders have enable_on_exec set - we don't specifically enable or disable any event during the record command Independent events and group leaders are initially disabled and get enabled by exec. Group members are ruled by group leaders as stated in 1). 3) For traced programs attached by perf (pid/tid): - we specifically enable or disable all events during the record command When attaching events to already running traced we enable/disable events specifically, as there's no initial traced exec call. Fixing appropriate perf_event_attr test case to cover this change. Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1352741644-16809-3-git-send-email-jolsa@redhat.com Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-record.c15
-rw-r--r--tools/perf/tests/attr/test-record-group1
-rw-r--r--tools/perf/tests/attr/test-record-group11
-rw-r--r--tools/perf/util/evsel.c42
4 files changed, 56 insertions, 3 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 371702785d6..268b356391f 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -701,7 +701,13 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
}
}
- perf_evlist__enable(evsel_list);
+ /*
+ * When perf is starting the traced process, all the events
+ * (apart from group members) have enable_on_exec=1 set,
+ * so don't spoil it by prematurely enabling them.
+ */
+ if (!perf_target__none(&opts->target))
+ perf_evlist__enable(evsel_list);
/*
* Let the child rip
@@ -724,7 +730,12 @@ static int __cmd_record(struct perf_record *rec, int argc, const char **argv)
waking++;
}
- if (done)
+ /*
+ * When perf is starting the traced process, at the end events
+ * die with the process and we wait for that. Thus no need to
+ * disable events in this case.
+ */
+ if (done && !perf_target__none(&opts->target))
perf_evlist__disable(evsel_list);
}
diff --git a/tools/perf/tests/attr/test-record-group b/tools/perf/tests/attr/test-record-group
index b945f770dc9..a6599e9a19d 100644
--- a/tools/perf/tests/attr/test-record-group
+++ b/tools/perf/tests/attr/test-record-group
@@ -15,3 +15,4 @@ sample_type=327
mmap=0
comm=0
enable_on_exec=0
+disabled=0
diff --git a/tools/perf/tests/attr/test-record-group1 b/tools/perf/tests/attr/test-record-group1
index 013572f2360..5a8359da38a 100644
--- a/tools/perf/tests/attr/test-record-group1
+++ b/tools/perf/tests/attr/test-record-group1
@@ -16,3 +16,4 @@ sample_type=327
mmap=0
comm=0
enable_on_exec=0
+disabled=0
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 6d4a5f6ed75..fc4faaa7afb 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -404,13 +404,40 @@ const char *perf_evsel__name(struct perf_evsel *evsel)
return evsel->name ?: "unknown";
}
+/*
+ * The enable_on_exec/disabled value strategy:
+ *
+ * 1) For any type of traced program:
+ * - all independent events and group leaders are disabled
+ * - all group members are enabled
+ *
+ * Group members are ruled by group leaders. They need to
+ * be enabled, because the group scheduling relies on that.
+ *
+ * 2) For traced programs executed by perf:
+ * - all independent events and group leaders have
+ * enable_on_exec set
+ * - we don't specifically enable or disable any event during
+ * the record command
+ *
+ * Independent events and group leaders are initially disabled
+ * and get enabled by exec. Group members are ruled by group
+ * leaders as stated in 1).
+ *
+ * 3) For traced programs attached by perf (pid/tid):
+ * - we specifically enable or disable all events during
+ * the record command
+ *
+ * When attaching events to already running traced we
+ * enable/disable events specifically, as there's no
+ * initial traced exec call.
+ */
void perf_evsel__config(struct perf_evsel *evsel,
struct perf_record_opts *opts)
{
struct perf_event_attr *attr = &evsel->attr;
int track = !evsel->idx; /* only the first counter needs these */
- attr->disabled = 1;
attr->sample_id_all = opts->sample_id_all_missing ? 0 : 1;
attr->inherit = !opts->no_inherit;
attr->read_format = PERF_FORMAT_TOTAL_TIME_ENABLED |
@@ -486,6 +513,19 @@ void perf_evsel__config(struct perf_evsel *evsel,
attr->mmap = track;
attr->comm = track;
+ /*
+ * XXX see the function comment above
+ *
+ * Disabling only independent events or group leaders,
+ * keeping group members enabled.
+ */
+ if (!evsel->leader)
+ attr->disabled = 1;
+
+ /*
+ * Setting enable_on_exec for independent events and
+ * group leaders for traced executed by perf.
+ */
if (perf_target__none(&opts->target) && (!evsel->leader))
attr->enable_on_exec = 1;
}