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authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>2014-06-06 07:13:52 +0000
committerArnaldo Carvalho de Melo <acme@redhat.com>2014-06-09 14:34:09 -0300
commitb4bf1130cdee7d5247bd3171530869809f5aca54 (patch)
tree3953290fe4598bc5557d5fe66f47f7519008e7f6 /tools
parent36d789a4d75f3826faa6e75b018942b63ffed1a0 (diff)
perf probe: Show error code and description in verbose mode
Show error code and description only in verbose mode if 'perf probe' command failed. Current 'perf probe' shows error code with final error message, and that is meaningless for many users. This changes error messages to show the error code and its description only in verbose mode (-v option). Without this patch: ----- # perf probe -a do_execve@hoge Probe point 'do_execve@hoge' not found. Error: Failed to add events. (-2) ----- With this patch, normally the message doesn't show the misterious error number: ----- # perf probe -a do_execve@hoge Probe point 'do_execve@hoge' not found. Error: Failed to add events. ----- And in verbose mode, it also shows additional error messages as below: ----- # perf probe -va do_execve@hoge probe-definition(0): do_execve@hoge symbol:do_execve file:hoge line:0 offset:0 return:0 lazy:(null) 0 arguments Looking at the vmlinux_path (6 entries long) Using /lib/modules/3.15.0-rc8+/build/vmlinux for symbols Open Debuginfo file: /lib/modules/3.15.0-rc8+/build/vmlinux Try to find probe point from debuginfo. Probe point 'do_execve@hoge' not found. Error: Failed to add events. Reason: No such file or directory (Code: -2) ----- Reported-by: Arnaldo Carvalho de Melo <acme@kernel.org> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20140606071352.6788.76943.stgit@kbuild-fedora.novalocal Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/builtin-probe.c23
1 files changed, 14 insertions, 9 deletions
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index cdcd4eb3a57d..c63fa2925075 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -288,6 +288,13 @@ static void cleanup_params(void)
memset(&params, 0, sizeof(params));
}
+static void pr_err_with_code(const char *msg, int err)
+{
+ pr_err("%s", msg);
+ pr_debug(" Reason: %s (Code: %d)", strerror(-err), err);
+ pr_err("\n");
+}
+
static int
__cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
{
@@ -379,7 +386,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
}
ret = parse_probe_event_argv(argc, argv);
if (ret < 0) {
- pr_err(" Error: Parse Error. (%d)\n", ret);
+ pr_err_with_code(" Error: Command Parse Error.", ret);
return ret;
}
}
@@ -419,8 +426,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
}
ret = show_perf_probe_events();
if (ret < 0)
- pr_err(" Error: Failed to show event list. (%d)\n",
- ret);
+ pr_err_with_code(" Error: Failed to show event list.", ret);
return ret;
}
if (params.show_funcs) {
@@ -445,8 +451,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
strfilter__delete(params.filter);
params.filter = NULL;
if (ret < 0)
- pr_err(" Error: Failed to show functions."
- " (%d)\n", ret);
+ pr_err_with_code(" Error: Failed to show functions.", ret);
return ret;
}
@@ -464,7 +469,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
ret = show_line_range(&params.line_range, params.target);
if (ret < 0)
- pr_err(" Error: Failed to show lines. (%d)\n", ret);
+ pr_err_with_code(" Error: Failed to show lines.", ret);
return ret;
}
if (params.show_vars) {
@@ -485,7 +490,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
strfilter__delete(params.filter);
params.filter = NULL;
if (ret < 0)
- pr_err(" Error: Failed to show vars. (%d)\n", ret);
+ pr_err_with_code(" Error: Failed to show vars.", ret);
return ret;
}
#endif
@@ -493,7 +498,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
if (params.dellist) {
ret = del_perf_probe_events(params.dellist);
if (ret < 0) {
- pr_err(" Error: Failed to delete events. (%d)\n", ret);
+ pr_err_with_code(" Error: Failed to delete events.", ret);
return ret;
}
}
@@ -504,7 +509,7 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
params.target,
params.force_add);
if (ret < 0) {
- pr_err(" Error: Failed to add events. (%d)\n", ret);
+ pr_err_with_code(" Error: Failed to add events.", ret);
return ret;
}
}

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