[PATCH -tip perf/probes 2/5] perf/probes: Improve error messages

[Masami Hiramatsu]

Improve error messages in perf-probe so that users can figure
out problems easily.

Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Reported-by: Ingo Molnar <mingo@xxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Jim Keniston <jkenisto@xxxxxxxxxx>
Cc: Ananth N Mavinakayanahalli <ananth@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Frank Ch. Eigler <fche@xxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jason Baron <jbaron@xxxxxxxxxx>
Cc: K.Prasad <prasad@xxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
---

 tools/perf/builtin-probe.c     |   21 ++++++++++++++-------
 tools/perf/util/probe-finder.c |    3 ++-
 2 files changed, 16 insertions(+), 8 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index a99a366..454ddfc 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -294,10 +294,11 @@ static int write_new_event(int fd, const char *buf)
 {
 	int ret;
 
-	printf("Adding new event: %s\n", buf);
 	ret = write(fd, buf, strlen(buf));
 	if (ret <= 0)
-		die("failed to create event.");
+		die("Failed to create event.");
+	else
+		printf("Added new event: %s\n", buf);
 
 	return ret;
 }
@@ -310,7 +311,7 @@ static int synthesize_probe_event(struct probe_point *pp)
 	int i, len, ret;
 	pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
 	if (!buf)
-		die("calloc");
+		die("Failed to allocate memory by calloc.");
 	ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
 	if (ret <= 0 || ret >= MAX_CMDLEN)
 		goto error;
@@ -363,7 +364,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
 		if (ret == -E2BIG)
 			semantic_error("probe point is too long.");
 		else if (ret < 0)
-			die("snprintf");
+			die("Failed to synthesize a probe point.");
 	}
 
 #ifndef NO_LIBDWARF
@@ -375,7 +376,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
 	else
 		fd = open_default_vmlinux();
 	if (fd < 0)
-		die("vmlinux/module file open");
+		die("Could not open vmlinux/module file.");
 
 	/* Searching probe points */
 	for (j = 0; j < session.nr_probe; j++) {
@@ -396,8 +397,14 @@ setup_probes:
 	/* Settng up probe points */
 	snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
 	fd = open(buf, O_WRONLY, O_APPEND);
-	if (fd < 0)
-		die("kprobe_events open");
+	if (fd < 0) {
+		if (errno == ENOENT)
+			die("kprobe_events file does not exist"
+			    " - please rebuild with CONFIG_KPROBE_TRACER.");
+		else
+			die("Could not open kprobe_events file: %s",
+			    strerror(errno));
+	}
 	for (j = 0; j < session.nr_probe; j++) {
 		pp = &session.probes[j];
 		if (pp->found == 1) {
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index db96186..86cead3 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -688,7 +688,8 @@ int find_probepoint(int fd, struct probe_point *pp)
 
 	ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
 	if (ret != DW_DLV_OK)
-		die("Failed to call dwarf_init(). Maybe, not a dwarf file.\n");
+		die("Not found dwarf info in the vmlinux"
+		    " - please rebuild with CONFIG_DEBUG_INFO.\n");
 
 	pp->found = 0;
 	while (++cu_number) {


-- 
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@xxxxxxxxxx
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