perf inject: Lazy build-id mmap2 event insertion

Add -B option that lazily inserts mmap2 events thereby dropping all
mmap events without samples. This is similar to the behavior of -b
where only build_id events are inserted when a dso is accessed in a
sample.

File size savings can be significant in system-wide mode, consider:

  $ perf record -g -a -o perf.data sleep 1
  $ perf inject -B -i perf.data -o perf.new.data
  $ ls -al perf.data perf.new.data
           5147049 perf.data
           2248493 perf.new.data

Give test coverage of the new option in pipe test.

Signed-off-by: Ian Rogers <[email protected]>
Acked-by: Namhyung Kim <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Anne Macedo <[email protected]>
Cc: Casey Chen <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Sun Haiyong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

2 files changed, 12 insertions, 0 deletions

diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index e781c8d56a9a..d729438b7d65 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -116,6 +116,7 @@ static void map__init(struct map *map, u64 start, u64 end, u64 pgoff,
 	map__set_mapping_type(map, MAPPING_TYPE__DSO);
 	assert(map__erange_warned(map) == false);
 	assert(map__priv(map) == false);
+	assert(map__hit(map) == false);
 }
 
 struct map *map__new(struct machine *machine, u64 start, u64 len,
diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 6c43f31a9fe0..4262f5a143be 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -35,6 +35,7 @@ DECLARE_RC_STRUCT(map) {
 	enum mapping_type	mapping_type:8;
 	bool			erange_warned;
 	bool			priv;
+	bool			hit;
 };
 
 struct kmap;
@@ -83,6 +84,11 @@ static inline bool map__priv(const struct map *map)
 	return RC_CHK_ACCESS(map)->priv;
 }
 
+static inline bool map__hit(const struct map *map)
+{
+	return RC_CHK_ACCESS(map)->hit;
+}
+
 static inline refcount_t *map__refcnt(struct map *map)
 {
 	return &RC_CHK_ACCESS(map)->refcnt;
@@ -287,6 +293,11 @@ static inline void map__set_priv(struct map *map)
 	RC_CHK_ACCESS(map)->priv = true;
 }
 
+static inline void map__set_hit(struct map *map)
+{
+	RC_CHK_ACCESS(map)->hit = true;
+}
+
 static inline void map__set_erange_warned(struct map *map)
 {
 	RC_CHK_ACCESS(map)->erange_warned = true;