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authorMasami Hiramatsu <mhiramat@kernel.org>2016-07-19 01:12:41 +0900
committerArnaldo Carvalho de Melo <acme@redhat.com>2016-07-18 19:46:34 -0300
commite70493429bb1acaad829caae01c61dd7056fe671 (patch)
treedf9148b84c01f2ab1a24cfa4c1534368b316febd /tools
parent9a6c582d57a0fc37fa4e13a69d9129fb3d98a401 (diff)
downloadlinux-e70493429bb1acaad829caae01c61dd7056fe671.tar.bz2
perf probe: Warn unmatched function filter correctly
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>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/map.c3
-rw-r--r--tools/perf/util/probe-event.c12
2 files changed, 13 insertions, 2 deletions
diff --git a/tools/perf/util/map.c b/tools/perf/util/map.c
index b39b12a1208d..728129ac653a 100644
--- a/tools/perf/util/map.c
+++ b/tools/perf/util/map.c
@@ -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);
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index d4f8835c0a27..953dc1ab2ed7 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -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))