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Subject[PATCH RFC V7 2/7] perf tools: Force period term to overload global settings
Date
From: Jiri Olsa <jolsa@kernel.org>

Currently the command line option settings beats the
per event period settings:

With no global settings, we get per-event configuration:

$ perf record -e 'cpu/instructions,period=20000/' sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 20000 ...

With 'c' option period setup, we get 'c' option value:
$ perf record -e 'cpu/instructions,period=20000/' -c 1000 sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 1000 ...

This patch makes the per-event settings overload the
global 'c' option setup:

$ perf record -e 'cpu/instructions,period=20000/' -c 1000 sleep 1
$ perf evlist -v
... { sample_period, sample_freq }: 20000 ...

I think the making the per-event settings to overload any other
config makes more sense than current state. However it breaks
the current 'period' term handling, which might cause some
noise.. so let's see ;-).

Also fixing parse event tests with the new behaviour.

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Kan Liang <kan.liang@intel.com>
---
tools/perf/Documentation/perf-record.txt | 2 +-
tools/perf/tests/parse-events.c | 12 ++++++++++--
tools/perf/util/evsel.c | 2 ++
tools/perf/util/evsel.h | 1 +
tools/perf/util/parse-events.c | 3 ++-
5 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 63ee040..ac41350 100644
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -46,7 +46,7 @@ OPTIONS
/sys/bus/event_sources/devices/<pmu>/format/*

There are also some params which are not defined in .../<pmu>/format/*.
- These params can be used to set event defaults.
+ These params can be used to overload default config values per event.
Here is a list of the params.
- 'period': Set event sampling period

diff --git a/tools/perf/tests/parse-events.c b/tools/perf/tests/parse-events.c
index d76963f..f65bb89 100644
--- a/tools/perf/tests/parse-events.c
+++ b/tools/perf/tests/parse-events.c
@@ -82,8 +82,12 @@ static int test__checkevent_symbolic_name_config(struct perf_evlist *evlist)
TEST_ASSERT_VAL("wrong type", PERF_TYPE_HARDWARE == evsel->attr.type);
TEST_ASSERT_VAL("wrong config",
PERF_COUNT_HW_CPU_CYCLES == evsel->attr.config);
+ /*
+ * The period value gets configured within perf_evlist__config,
+ * while this test executes only parse events method.
+ */
TEST_ASSERT_VAL("wrong period",
- 100000 == evsel->attr.sample_period);
+ 0 == evsel->attr.sample_period);
TEST_ASSERT_VAL("wrong config1",
0 == evsel->attr.config1);
TEST_ASSERT_VAL("wrong config2",
@@ -406,7 +410,11 @@ static int test__checkevent_pmu(struct perf_evlist *evlist)
TEST_ASSERT_VAL("wrong config", 10 == evsel->attr.config);
TEST_ASSERT_VAL("wrong config1", 1 == evsel->attr.config1);
TEST_ASSERT_VAL("wrong config2", 3 == evsel->attr.config2);
- TEST_ASSERT_VAL("wrong period", 1000 == evsel->attr.sample_period);
+ /*
+ * The period value gets configured within perf_evlist__config,
+ * while this test executes only parse events method.
+ */
+ TEST_ASSERT_VAL("wrong period", 0 == evsel->attr.sample_period);

return 0;
}
diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
index 048d61d..7d3acba 100644
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -594,6 +594,8 @@ static void apply_config_terms(struct perf_event_attr *attr __maybe_unused,

list_for_each_entry(term, config_terms, list) {
switch (term->type) {
+ case PERF_EVSEL__CONFIG_TERM_PERIOD:
+ attr->sample_period = term->val.period;
default:
break;
}
diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
index 0339819..a7d2175 100644
--- a/tools/perf/util/evsel.h
+++ b/tools/perf/util/evsel.h
@@ -38,6 +38,7 @@ struct cgroup_sel;
* perf_evsel::config_terms list head.
*/
enum {
+ PERF_EVSEL__CONFIG_TERM_PERIOD,
PERF_EVSEL__CONFIG_TERM_MAX,
};

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 3271d13..09bee93 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -596,7 +596,6 @@ do { \
break;
case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
CHECK_TYPE_VAL(NUM);
- attr->sample_period = term->val.num;
break;
case PARSE_EVENTS__TERM_TYPE_BRANCH_SAMPLE_TYPE:
/*
@@ -649,6 +648,8 @@ do { \

list_for_each_entry(term, head_config, list) {
switch (term->type_term) {
+ case PARSE_EVENTS__TERM_TYPE_SAMPLE_PERIOD:
+ ADD_CONFIG_TERM(PERIOD, period, term->val.num);
default:
break;
}
--
1.8.3.1


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