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Subject[PATCH 02/17] perf util: Add more debug message on failure path
Date
From: Namhyung Kim <namhyung.kim@lge.com>

It's helpful for debugging on tracing features.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/util/header.c | 4 ++-
tools/perf/util/trace-event-read.c | 53 ++++++++++++++++++++++++++------------
2 files changed, 39 insertions(+), 18 deletions(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index f558f83769af..11b08f24ba42 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2700,8 +2700,10 @@ static int perf_evsel__prepare_tracepoint_event(struct perf_evsel *evsel,
}

event = pevent_find_event(pevent, evsel->attr.config);
- if (event == NULL)
+ if (event == NULL) {
+ pr_debug("cannot find event format for %d\n", (int)evsel->attr.config);
return -1;
+ }

if (!evsel->name) {
snprintf(bf, sizeof(bf), "%s:%s", event->system, event->name);
diff --git a/tools/perf/util/trace-event-read.c b/tools/perf/util/trace-event-read.c
index e084e5e654b6..0e3b3f527320 100644
--- a/tools/perf/util/trace-event-read.c
+++ b/tools/perf/util/trace-event-read.c
@@ -262,39 +262,53 @@ static int read_header_files(struct pevent *pevent)

static int read_ftrace_file(struct pevent *pevent, unsigned long long size)
{
+ int ret;
char *buf;

buf = malloc(size);
- if (buf == NULL)
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
return -1;
+ }

- if (do_read(buf, size) < 0) {
- free(buf);
- return -1;
+ ret = do_read(buf, size);
+ if (ret < 0) {
+ pr_debug("error reading ftrace file.\n");
+ goto out;
}

- parse_ftrace_file(pevent, buf, size);
+ ret = parse_ftrace_file(pevent, buf, size);
+ if (ret < 0)
+ pr_debug("error parsing ftrace file.\n");
+out:
free(buf);
- return 0;
+ return ret;
}

static int read_event_file(struct pevent *pevent, char *sys,
unsigned long long size)
{
+ int ret;
char *buf;

buf = malloc(size);
- if (buf == NULL)
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
return -1;
+ }

- if (do_read(buf, size) < 0) {
+ ret = do_read(buf, size);
+ if (ret < 0) {
free(buf);
- return -1;
+ goto out;
}

- parse_event_file(pevent, buf, size, sys);
+ ret = parse_event_file(pevent, buf, size, sys);
+ if (ret < 0)
+ pr_debug("error parsing event file.\n");
+out:
free(buf);
- return 0;
+ return ret;
}

static int read_ftrace_files(struct pevent *pevent)
@@ -347,6 +361,7 @@ static int read_saved_cmdline(struct pevent *pevent)
{
unsigned long long size;
char *buf;
+ int ret;

/* it can have 0 size */
size = read8(pevent);
@@ -354,18 +369,22 @@ static int read_saved_cmdline(struct pevent *pevent)
return 0;

buf = malloc(size + 1);
- if (buf == NULL)
+ if (buf == NULL) {
+ pr_debug("memory allocation failure\n");
return -1;
+ }

- if (do_read(buf, size) < 0) {
- free(buf);
- return -1;
+ ret = do_read(buf, size);
+ if (ret < 0) {
+ pr_debug("error reading saved cmdlines\n");
+ goto out;
}

parse_saved_cmdline(pevent, buf, size);
-
+ ret = 0;
+out:
free(buf);
- return 0;
+ return ret;
}

ssize_t trace_report(int fd, struct pevent **ppevent, bool __repipe)
--
1.7.11.7


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