perf tools: Fix dso_id inode generation comparison

Synthesized MMAP events have zero ino_generation, so do not compare
them to DSOs with a real ino_generation otherwise we end up with a DSO
without a build id.

Fixes: 0e3149f86b99ddab ("perf dso: Move dso_id from 'struct map' to 'struct dso'")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: kvm@vger.kernel.org
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20220711093218.10967-2-adrian.hunter@intel.com
[ Added clarification to the comment from Ian + more detailed explanation from Adrian ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/dsos.c b/tools/perf/util/dsos.c
index b97366f..2bd23e4 100644 (file)
--- a/tools/perf/util/dsos.c
+++ b/tools/perf/util/dsos.c
@@ -23,8 +23,19 @@ static int __dso_id__cmp(struct dso_id *a, struct dso_id *b)
        if (a->ino > b->ino) return -1;
        if (a->ino < b->ino) return 1;
 
-       if (a->ino_generation > b->ino_generation) return -1;
-       if (a->ino_generation < b->ino_generation) return 1;
+       /*
+        * Synthesized MMAP events have zero ino_generation, avoid comparing
+        * them with MMAP events with actual ino_generation.
+        *
+        * I found it harmful because the mismatch resulted in a new
+        * dso that did not have a build ID whereas the original dso did have a
+        * build ID. The build ID was essential because the object was not found
+        * otherwise. - Adrian
+        */
+       if (a->ino_generation && b->ino_generation) {
+               if (a->ino_generation > b->ino_generation) return -1;
+               if (a->ino_generation < b->ino_generation) return 1;
+       }
 
        return 0;
 }