linux-kernel - [PATCH v3 3/5] perf evlist: Always use arch_evlist__add_default

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Date:   Fri, 10 Jun 2022 10:54:47 +0800
From:   zhengjun.xing@...ux.intel.com
To:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...el.com, jolsa@...nel.org, namhyung@...nel.org
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        irogers@...gle.com, ak@...ux.intel.com, kan.liang@...ux.intel.com,
        zhengjun.xing@...ux.intel.com
Subject: [PATCH v3 3/5] perf evlist: Always use arch_evlist__add_default_attrs()

From: Kan Liang <kan.liang@...ux.intel.com>

Current perf stat uses the evlist__add_default_attrs() to add the
generic default attrs, and uses arch_evlist__add_default_attrs()
to add the Arch specific default attrs, e.g., Topdown for X86.

It works well for the non-hybrid platforms. However, for a hybrid
platform, the hard code generic default attrs don't work.

Uses arch_evlist__add_default_attrs() to replace the
evlist__add_default_attrs(). The arch_evlist__add_default_attrs() is
modified to invoke the same __evlist__add_default_attrs() for the
generic default attrs. No functional change.

Add default_null_attrs[] to indicate the Arch specific attrs.
No functional change for the Arch specific default attrs either.

Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
Signed-off-by: Zhengjun Xing <zhengjun.xing@...ux.intel.com>
---
Change log:
  v3:
    * no change since v1.

 tools/perf/arch/x86/util/evlist.c | 7 ++++++-
 tools/perf/builtin-stat.c         | 6 +++++-
 tools/perf/util/evlist.c          | 9 +++++++--
 tools/perf/util/evlist.h          | 7 +++++--
 4 files changed, 23 insertions(+), 6 deletions(-)

diff --git a/tools/perf/arch/x86/util/evlist.c b/tools/perf/arch/x86/util/evlist.c
index 68f681ad54c1..777bdf182a58 100644
--- a/tools/perf/arch/x86/util/evlist.c
+++ b/tools/perf/arch/x86/util/evlist.c
@@ -8,8 +8,13 @@
 #define TOPDOWN_L1_EVENTS	"{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound}"
 #define TOPDOWN_L2_EVENTS	"{slots,topdown-retiring,topdown-bad-spec,topdown-fe-bound,topdown-be-bound,topdown-heavy-ops,topdown-br-mispredict,topdown-fetch-lat,topdown-mem-bound}"
 
-int arch_evlist__add_default_attrs(struct evlist *evlist)
+int arch_evlist__add_default_attrs(struct evlist *evlist,
+				   struct perf_event_attr *attrs,
+				   size_t nr_attrs)
 {
+	if (nr_attrs)
+		return __evlist__add_default_attrs(evlist, attrs, nr_attrs);
+
 	if (!pmu_have_event("cpu", "slots"))
 		return 0;
 
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 6ac79d95f3b5..837c3ca91af1 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1777,6 +1777,9 @@ static int add_default_attributes(void)
 	(PERF_COUNT_HW_CACHE_OP_PREFETCH	<<  8) |
 	(PERF_COUNT_HW_CACHE_RESULT_MISS	<< 16)				},
 };
+
+	struct perf_event_attr default_null_attrs[] = {};
+
 	/* Set attrs if no event is selected and !null_run: */
 	if (stat_config.null_run)
 		return 0;
@@ -1958,7 +1961,8 @@ static int add_default_attributes(void)
 			return -1;
 
 		stat_config.topdown_level = TOPDOWN_MAX_LEVEL;
-		if (arch_evlist__add_default_attrs(evsel_list) < 0)
+		/* Platform specific attrs */
+		if (evlist__add_default_attrs(evsel_list, default_null_attrs) < 0)
 			return -1;
 	}
 
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c
index 48af7d379d82..efa5f006b5c6 100644
--- a/tools/perf/util/evlist.c
+++ b/tools/perf/util/evlist.c
@@ -342,9 +342,14 @@ int __evlist__add_default_attrs(struct evlist *evlist, struct perf_event_attr *a
 	return evlist__add_attrs(evlist, attrs, nr_attrs);
 }
 
-__weak int arch_evlist__add_default_attrs(struct evlist *evlist __maybe_unused)
+__weak int arch_evlist__add_default_attrs(struct evlist *evlist,
+					  struct perf_event_attr *attrs,
+					  size_t nr_attrs)
 {
-	return 0;
+	if (!nr_attrs)
+		return 0;
+
+	return __evlist__add_default_attrs(evlist, attrs, nr_attrs);
 }
 
 struct evsel *evlist__find_tracepoint_by_id(struct evlist *evlist, int id)
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h
index 1bde9ccf4e7d..129095c0fe6d 100644
--- a/tools/perf/util/evlist.h
+++ b/tools/perf/util/evlist.h
@@ -107,10 +107,13 @@ static inline int evlist__add_default(struct evlist *evlist)
 int __evlist__add_default_attrs(struct evlist *evlist,
 				     struct perf_event_attr *attrs, size_t nr_attrs);
 
+int arch_evlist__add_default_attrs(struct evlist *evlist,
+				   struct perf_event_attr *attrs,
+				   size_t nr_attrs);
+
 #define evlist__add_default_attrs(evlist, array) \
-	__evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
+	arch_evlist__add_default_attrs(evlist, array, ARRAY_SIZE(array))
 
-int arch_evlist__add_default_attrs(struct evlist *evlist);
 struct evsel *arch_evlist__leader(struct list_head *list);
 
 int evlist__add_dummy(struct evlist *evlist);
-- 
2.25.1