perf annotate: Show better message when no vmlinux is found
In both --tui and --stdio, in 'annotate', 'top', 'report' when trying to
annotate a kernel symbol having just access to a kallsyms file, that
doesn't have the DWARF info needed for annotation.
Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Tom Zanussi <tzanussi@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 70ec422..0d0830c 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -295,12 +295,23 @@
}
if (dso->origin == DSO__ORIG_KERNEL) {
+ char bf[BUILD_ID_SIZE * 2 + 16] = " with build id ";
+ char *build_id_msg = NULL;
+
if (dso->annotate_warned)
goto out_free_filename;
+
+ if (dso->has_build_id) {
+ build_id__sprintf(dso->build_id,
+ sizeof(dso->build_id), bf + 15);
+ build_id_msg = bf;
+ }
err = -ENOENT;
dso->annotate_warned = 1;
- pr_err("Can't annotate %s: No vmlinux file was found in the "
- "path\n", sym->name);
+ pr_err("Can't annotate %s: No vmlinux file%s was found in the "
+ "path.\nPlease use 'perf buildid-cache -av vmlinux' or "
+ "--vmlinux vmlinux.\n",
+ sym->name, build_id_msg ?: "");
goto out_free_filename;
}