perf map: Move maj/min/ino/ino_generation to separate struct

And this patch highlights where these fields are being used: in the sort
order where it uses it to compare maps and classify samples taking into
account not just the DSO, but those DSO id fields.

I think these should be used to differentiate DSOs with the same name
but different 'struct dso_id' fields, i.e. these fields should move to
'struct dso' and then be used as part of the key when doing lookups for
DSOs, in addition to the DSO name.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-8v5isitqy0dup47nnwkpc80f@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 11 insertions, 3 deletions

diff --git a/tools/perf/util/map.h b/tools/perf/util/map.h
index 0a6c45f85cd9..70d87dcbe35d 100644
--- a/tools/perf/util/map.h
+++ b/tools/perf/util/map.h
@@ -18,6 +18,16 @@ struct map_groups;
 struct machine;
 struct evsel;
 
+/*
+ * Data about backing storage DSO, comes from PERF_RECORD_MMAP2 meta events
+ */
+struct dso_id {
+	u32	maj;
+	u32	min;
+	u64	ino;
+	u64	ino_generation;
+};
+
 struct map {
 	union {
 		struct rb_node	rb_node;
@@ -30,9 +40,6 @@ struct map {
 	u32			prot;
 	u64			pgoff;
 	u64			reloc;
-	u32			maj, min; /* only valid for MMAP2 record */
-	u64			ino;      /* only valid for MMAP2 record */
-	u64			ino_generation;/* only valid for MMAP2 record */
 
 	/* ip -> dso rip */
 	u64			(*map_ip)(struct map *, u64);
@@ -40,6 +47,7 @@ struct map {
 	u64			(*unmap_ip)(struct map *, u64);
 
 	struct dso		*dso;
+	struct dso_id		dso_id;
 	refcount_t		refcnt;
 	u32			flags;
 };