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perf parse-events: Handle uncore event aliases in small groups properly

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Perf stat doesn't count the uncore event aliases from the same uncore
block in a group, for example:

  perf stat -e '{unc_m_cas_count.all,unc_m_clockticks}' -a -I 1000
  #           time             counts unit events
       1.000447342      <not counted>      unc_m_cas_count.all
       1.000447342      <not counted>      unc_m_clockticks
       2.000740654      <not counted>      unc_m_cas_count.all
       2.000740654      <not counted>      unc_m_clockticks

The output is very misleading. It gives a wrong impression that the
uncore event doesn't work.

An uncore block could be composed by several PMUs. An uncore event alias
is a joint name which means the same event runs on all PMUs of a block.
Perf doesn't support mixed events from different PMUs in the same group.
It is wrong to put uncore event aliases in a big group.

The right way is to split the big group into multiple small groups which
only include the events from the same PMU.

Only uncore event aliases from the same uncore block should be specially
handled here. It doesn't make sense to mix the uncore events with other
uncore events from different blocks or even core events in a group.

With the patch:
  #           time             counts unit events
     1.001557653            140,833      unc_m_cas_count.all
     1.001557653      1,330,231,332      unc_m_clockticks
     2.002709483             85,007      unc_m_cas_count.all
     2.002709483      1,429,494,563      unc_m_clockticks

Reported-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: Agustin Vega-Frias <agustinv@codeaurora.org>
Cc: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
Cc: Jin Yao <yao.jin@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Shaokun Zhang <zhangshaokun@hisilicon.com>
Cc: Will Deacon <will.deacon@arm.com>
Link: http://lkml.kernel.org/r/1525727623-19768-1-git-send-email-kan.liang@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Kan Liang 2018-05-07 14:13:43 -07:00 committed by Arnaldo Carvalho de Melo
parent 5654997838
commit 3cdc5c2cb9
4 changed files with 137 additions and 9 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
tools/perf/util/evsel.h
View file

@ -127,6 +127,7 @@ struct perf_evsel {
bool precise_max;
bool ignore_missing_thread;
bool forced_leader;
bool use_uncore_alias;
/* parse modifier helper */
int exclude_GH;
int nr_members;

130
tools/perf/util/parse-events.c
View file

@ -1219,13 +1219,16 @@ int parse_events_add_numeric(struct parse_events_state *parse_state,
int parse_events_add_pmu(struct parse_events_state *parse_state,
struct list_head *list, char *name,
struct list_head *head_config, bool auto_merge_stats)
struct list_head *head_config,
bool auto_merge_stats,
bool use_alias)
{
struct perf_event_attr attr;
struct perf_pmu_info info;
struct perf_pmu *pmu;
struct perf_evsel *evsel;
struct parse_events_error *err = parse_state->error;
bool use_uncore_alias;
LIST_HEAD(config_terms);
pmu = perf_pmu__find(name);
@ -1244,11 +1247,14 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
memset(&attr, 0, sizeof(attr));
}
use_uncore_alias = (pmu->is_uncore && use_alias);
if (!head_config) {
attr.type = pmu->type;
evsel = __add_event(list, &parse_state->idx, &attr, NULL, pmu, NULL, auto_merge_stats);
if (evsel) {
evsel->pmu_name = name;
evsel->use_uncore_alias = use_uncore_alias;
return 0;
} else {
return -ENOMEM;
@ -1282,6 +1288,7 @@ int parse_events_add_pmu(struct parse_events_state *parse_state,
evsel->metric_expr = info.metric_expr;
evsel->metric_name = info.metric_name;
evsel->pmu_name = name;
evsel->use_uncore_alias = use_uncore_alias;
}
return evsel ? 0 : -ENOMEM;
@ -1317,7 +1324,8 @@ int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
list_add_tail(&term->list, head);
if (!parse_events_add_pmu(parse_state, list,
pmu->name, head, true)) {
pmu->name, head,
true, true)) {
pr_debug("%s -> %s/%s/\n", str,
pmu->name, alias->str);
ok++;
@ -1339,7 +1347,120 @@ int parse_events__modifier_group(struct list_head *list,
return parse_events__modifier_event(list, event_mod, true);
}
void parse_events__set_leader(char *name, struct list_head *list)
/*
* Check if the two uncore PMUs are from the same uncore block
* The format of the uncore PMU name is uncore_#blockname_#pmuidx
*/
static bool is_same_uncore_block(const char *pmu_name_a, const char *pmu_name_b)
{
char *end_a, *end_b;
end_a = strrchr(pmu_name_a, '_');
end_b = strrchr(pmu_name_b, '_');
if (!end_a || !end_b)
return false;
if ((end_a - pmu_name_a) != (end_b - pmu_name_b))
return false;
return (strncmp(pmu_name_a, pmu_name_b, end_a - pmu_name_a) == 0);
}
static int
parse_events__set_leader_for_uncore_aliase(char *name, struct list_head *list,
struct parse_events_state *parse_state)
{
struct perf_evsel *evsel, *leader;
uintptr_t *leaders;
bool is_leader = true;
int i, nr_pmu = 0, total_members, ret = 0;
leader = list_first_entry(list, struct perf_evsel, node);
evsel = list_last_entry(list, struct perf_evsel, node);
total_members = evsel->idx - leader->idx + 1;
leaders = calloc(total_members, sizeof(uintptr_t));
if (WARN_ON(!leaders))
return 0;
/*
* Going through the whole group and doing sanity check.
* All members must use alias, and be from the same uncore block.
* Also, storing the leader events in an array.
*/
__evlist__for_each_entry(list, evsel) {
/* Only split the uncore group which members use alias */
if (!evsel->use_uncore_alias)
goto out;
/* The events must be from the same uncore block */
if (!is_same_uncore_block(leader->pmu_name, evsel->pmu_name))
goto out;
if (!is_leader)
continue;
/*
* If the event's PMU name starts to repeat, it must be a new
* event. That can be used to distinguish the leader from
* other members, even they have the same event name.
*/
if ((leader != evsel) && (leader->pmu_name == evsel->pmu_name)) {
is_leader = false;
continue;
}
/* The name is always alias name */
WARN_ON(strcmp(leader->name, evsel->name));
/* Store the leader event for each PMU */
leaders[nr_pmu++] = (uintptr_t) evsel;
}
/* only one event alias */
if (nr_pmu == total_members) {
parse_state->nr_groups--;
goto handled;
}
/*
* An uncore event alias is a joint name which means the same event
* runs on all PMUs of a block.
* Perf doesn't support mixed events from different PMUs in the same
* group. The big group has to be split into multiple small groups
* which only include the events from the same PMU.
*
* Here the uncore event aliases must be from the same uncore block.
* The number of PMUs must be same for each alias. The number of new
* small groups equals to the number of PMUs.
* Setting the leader event for corresponding members in each group.
*/
i = 0;
__evlist__for_each_entry(list, evsel) {
if (i >= nr_pmu)
i = 0;
evsel->leader = (struct perf_evsel *) leaders[i++];
}
/* The number of members and group name are same for each group */
for (i = 0; i < nr_pmu; i++) {
evsel = (struct perf_evsel *) leaders[i];
evsel->nr_members = total_members / nr_pmu;
evsel->group_name = name ? strdup(name) : NULL;
}
/* Take the new small groups into account */
parse_state->nr_groups += nr_pmu - 1;
handled:
ret = 1;
out:
free(leaders);
return ret;
}
void parse_events__set_leader(char *name, struct list_head *list,
struct parse_events_state *parse_state)
{
struct perf_evsel *leader;
@ -1348,6 +1469,9 @@ void parse_events__set_leader(char *name, struct list_head *list)
return;
}
if (parse_events__set_leader_for_uncore_aliase(name, list, parse_state))
return;
__perf_evlist__set_leader(list);
leader = list_entry(list->next, struct perf_evsel, node);
leader->group_name = name ? strdup(name) : NULL;

7
tools/perf/util/parse-events.h
View file

@ -167,7 +167,9 @@ int parse_events_add_breakpoint(struct list_head *list, int *idx,
void *ptr, char *type, u64 len);
int parse_events_add_pmu(struct parse_events_state *parse_state,
struct list_head *list, char *name,
struct list_head *head_config, bool auto_merge_stats);
struct list_head *head_config,
bool auto_merge_stats,
bool use_alias);
int parse_events_multi_pmu_add(struct parse_events_state *parse_state,
char *str,
@ -178,7 +180,8 @@ int parse_events_copy_term_list(struct list_head *old,
enum perf_pmu_event_symbol_type
perf_pmu__parse_check(const char *name);
void parse_events__set_leader(char *name, struct list_head *list);
void parse_events__set_leader(char *name, struct list_head *list,
struct parse_events_state *parse_state);
void parse_events_update_lists(struct list_head *list_event,
struct list_head *list_all);
void parse_events_evlist_error(struct parse_events_state *parse_state,

8
tools/perf/util/parse-events.y
View file

@ -161,7 +161,7 @@ PE_NAME '{' events '}'
struct list_head *list = $3;
inc_group_count(list, _parse_state);
parse_events__set_leader($1, list);
parse_events__set_leader($1, list, _parse_state);
$$ = list;
}
|
@ -170,7 +170,7 @@ PE_NAME '{' events '}'
struct list_head *list = $2;
inc_group_count(list, _parse_state);
parse_events__set_leader(NULL, list);
parse_events__set_leader(NULL, list, _parse_state);
$$ = list;
}
@ -232,7 +232,7 @@ PE_NAME opt_event_config
YYABORT;
ALLOC_LIST(list);
if (parse_events_add_pmu(_parse_state, list, $1, $2, false)) {
if (parse_events_add_pmu(_parse_state, list, $1, $2, false, false)) {
struct perf_pmu *pmu = NULL;
int ok = 0;
char *pattern;
@ -251,7 +251,7 @@ PE_NAME opt_event_config
free(pattern);
YYABORT;
}
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true))
if (!parse_events_add_pmu(_parse_state, list, pmu->name, terms, true, false))
ok++;
parse_events_terms__delete(terms);
}