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authorAndi Kleen <ak@linux.intel.com>2015-11-05 19:06:07 -0800
committerArnaldo Carvalho de Melo <acme@redhat.com>2015-11-06 10:20:48 -0300
commit62ec9b3f02a9bccaf699bd4691db98f779c3075f (patch)
tree304607c77ef4d6cb3defc5bae0744ffbac5034b0
parente0547311133159bf95f7998726e4e4932d78d8ce (diff)
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perf annotate: Inform the user about objdump failures in --stdio
When the browser fails to annotate it is difficult for users to find out what went wrong. Add some errors for objdump failures that are displayed in the UI. Note it would be even better to handle these errors smarter, like falling back to the binary when the debug info is somehow corrupted. But for now just giving a better error is an improvement. Committer note: This works for --stdio, where errors just scroll by the screen: # perf annotate --stdio intel_idle Failure running objdump --start-address=0xffffffff81418290 --stop-address=0xffffffff814183ae -l -d --no-show-raw -S -C /root/.debug/.build-id/28/2777c262e6b3c0451375163c9a81c893218ab1 2>/dev/null|grep -v /root/.debug/.build-id/28/2777c262e6b3c0451375163c9a81c893218ab1|expand Percent | Source code & Disassembly of vmlinux for cycles:pp ------------------------------------------------------------------ And with that one can use that command line to try to find out more about what happened instead of getting a blank screen, an improvement. We need tho to improve this further to get it to work with other UIs, like --tui and --gtk, where it continues showing a blank screen, no messages, as the pr_err() used is enough just for --stdio. Signed-off-by: Andi Kleen <ak@linux.intel.com> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: http://lkml.kernel.org/r/1446779167-18949-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
-rw-r--r--tools/perf/util/annotate.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index 0fc8d7a2fea5..f2974da0185a 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1084,6 +1084,7 @@ int symbol__annotate(struct symbol *sym, struct map *map, size_t privsize)
struct kcore_extract kce;
bool delete_extract = false;
int lineno = 0;
+ int nline;
if (filename)
symbol__join_symfs(symfs_filename, filename);
@@ -1179,6 +1180,9 @@ fallback:
ret = decompress_to_file(m.ext, symfs_filename, fd);
+ if (ret)
+ pr_err("Cannot decompress %s %s\n", m.ext, symfs_filename);
+
free(m.ext);
close(fd);
@@ -1204,13 +1208,25 @@ fallback:
pr_debug("Executing: %s\n", command);
file = popen(command, "r");
- if (!file)
+ if (!file) {
+ pr_err("Failure running %s\n", command);
+ /*
+ * If we were using debug info should retry with
+ * original binary.
+ */
goto out_remove_tmp;
+ }
- while (!feof(file))
+ nline = 0;
+ while (!feof(file)) {
if (symbol__parse_objdump_line(sym, map, file, privsize,
&lineno) < 0)
break;
+ nline++;
+ }
+
+ if (nline == 0)
+ pr_err("No output from %s\n", command);
/*
* kallsyms does not have symbol sizes so there may a nop at the end.