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perf probe: Warn unmatched function filter correctly

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Warn unmatched function filter correctly instead of warning
"symbol-loading error", since that can be a filter issue.

From the technical point of view, this adds a filter chech in map__load
and if there is a filter, it returns -2 (filter-out), instead of -1
(error), and perf-probe checks it and change message.

E.g. without this fix:

  # perf probe -F rt_sp*
  no symbols found in [kernel.kallsyms], maybe install a debug package?
  Failed to load symbols in kernel

With this fix:

  # perf probe -F rt_sp*
  no symbols passed the given filter.
  Failed to find symbols matched to "rt_sp*"
    Error: Failed to show functions.

Reported-and-Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/146885835596.16106.2293540792775552481.stgit@devbox
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2016-07-19 01:12:41 +09:00 committed by Arnaldo Carvalho de Melo
parent 9a6c582d57
commit e70493429b
2 changed files with 13 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
tools/perf/util/map.c
View File

@ -312,6 +312,9 @@ int map__load(struct map *map, symbol_filter_t filter)
pr_warning("%.*s was updated (is prelink enabled?). "
"Restart the long running apps that use it!\n",
(int)real_len, name);
} else if (filter) {
pr_warning("no symbols passed the given filter.\n");
return -2; /* Empty but maybe by the filter */
} else {
pr_warning("no symbols found in %s, maybe install "
"a debug package?\n", name);

12
tools/perf/util/probe-event.c
View File

@ -3312,8 +3312,16 @@ int show_available_funcs(const char *target, struct strfilter *_filter,
/* Load symbols with given filter */
available_func_filter = _filter;
if (map__load(map, filter_available_functions)) {
pr_err("Failed to load symbols in %s\n", (target) ? : "kernel");
ret = map__load(map, filter_available_functions);
if (ret) {
if (ret == -2) {
char *str = strfilter__string(_filter);
pr_err("Failed to find symbols matched to \"%s\"\n",
str);
free(str);
} else
pr_err("Failed to load symbols in %s\n",
(target) ? : "kernel");
goto end;
}
if (!dso__sorted_by_name(map->dso, map->type))