linux-kernel - [PATCH 27/49] perf util: Save pmu name to struct perf_pmu

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Date:   Mon,  8 Feb 2021 07:25:24 -0800
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, acme@...nel.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     tglx@...utronix.de, bp@...en8.de, namhyung@...nel.org,
        jolsa@...hat.com, ak@...ux.intel.com, yao.jin@...ux.intel.com,
        alexander.shishkin@...ux.intel.com, adrian.hunter@...el.com
Subject: [PATCH 27/49] perf util: Save pmu name to struct perf_pmu_alias

From: Jin Yao <yao.jin@...ux.intel.com>

On hybrid platform, one event is available on one pmu
(such as, cpu_core or cpu_atom).

This patch saves the pmu name to the pmu field of struct perf_pmu_alias.
Then next we can know the pmu where the event can be enabled.

Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
---
 tools/perf/util/pmu.c | 17 +++++++++++++----
 tools/perf/util/pmu.h |  1 +
 2 files changed, 14 insertions(+), 4 deletions(-)

diff --git a/tools/perf/util/pmu.c b/tools/perf/util/pmu.c
index 44ef283..0c25457 100644
--- a/tools/perf/util/pmu.c
+++ b/tools/perf/util/pmu.c
@@ -283,6 +283,7 @@ void perf_pmu_free_alias(struct perf_pmu_alias *newalias)
 	zfree(&newalias->str);
 	zfree(&newalias->metric_expr);
 	zfree(&newalias->metric_name);
+	zfree(&newalias->pmu);
 	parse_events_terms__purge(&newalias->terms);
 	free(newalias);
 }
@@ -297,6 +298,10 @@ static bool perf_pmu_merge_alias(struct perf_pmu_alias *newalias,
 
 	list_for_each_entry(a, alist, list) {
 		if (!strcasecmp(newalias->name, a->name)) {
+			if (newalias->pmu && a->pmu &&
+			    !strcasecmp(newalias->pmu, a->pmu)) {
+				continue;
+			}
 			perf_pmu_update_alias(a, newalias);
 			perf_pmu_free_alias(newalias);
 			return true;
@@ -311,7 +316,8 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 				 char *unit, char *perpkg,
 				 char *metric_expr,
 				 char *metric_name,
-				 char *deprecated)
+				 char *deprecated,
+				 char *pmu)
 {
 	struct parse_events_term *term;
 	struct perf_pmu_alias *alias;
@@ -382,6 +388,7 @@ static int __perf_pmu__new_alias(struct list_head *list, char *dir, char *name,
 	}
 	alias->per_pkg = perpkg && sscanf(perpkg, "%d", &num) == 1 && num == 1;
 	alias->str = strdup(newval);
+	alias->pmu = pmu ? strdup(pmu) : NULL;
 
 	if (deprecated)
 		alias->deprecated = true;
@@ -407,7 +414,7 @@ static int perf_pmu__new_alias(struct list_head *list, char *dir, char *name, FI
 	strim(buf);
 
 	return __perf_pmu__new_alias(list, dir, name, NULL, buf, NULL, NULL, NULL,
-				     NULL, NULL, NULL, NULL);
+				     NULL, NULL, NULL, NULL, NULL);
 }
 
 static inline bool pmu_alias_info_file(char *name)
@@ -797,7 +804,8 @@ void pmu_add_cpu_aliases_map(struct list_head *head, struct perf_pmu *pmu,
 				(char *)pe->unit, (char *)pe->perpkg,
 				(char *)pe->metric_expr,
 				(char *)pe->metric_name,
-				(char *)pe->deprecated);
+				(char *)pe->deprecated,
+				(char *)pe->pmu);
 	}
 }
 
@@ -870,7 +878,8 @@ static int pmu_add_sys_aliases_iter_fn(struct pmu_event *pe, void *data)
 				      (char *)pe->perpkg,
 				      (char *)pe->metric_expr,
 				      (char *)pe->metric_name,
-				      (char *)pe->deprecated);
+				      (char *)pe->deprecated,
+				      NULL);
 	}
 
 	return 0;
diff --git a/tools/perf/util/pmu.h b/tools/perf/util/pmu.h
index 8164388..0e724d5 100644
--- a/tools/perf/util/pmu.h
+++ b/tools/perf/util/pmu.h
@@ -72,6 +72,7 @@ struct perf_pmu_alias {
 	bool deprecated;
 	char *metric_expr;
 	char *metric_name;
+	char *pmu;
 };
 
 struct perf_pmu *perf_pmu__find(const char *name);
-- 
2.7.4