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perf/probes: Improve error messages 

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

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Frank Ch. Eigler <fche@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
LKML-Reference: <20091104001221.3454.52030.stgit@harusame>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu 2009-11-03 19:12:21 -05:00 committed by Ingo Molnar
parent c43f9d1e61
commit a7f4328b91
2 changed files with 14 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
tools/perf/builtin-probe.c
View File

@ -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 +397,13 @@ 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) {

2
tools/perf/util/probe-finder.c
View File

@ -688,7 +688,7 @@ 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("No dwarf info found in the vmlinux - please rebuild with CONFIG_DEBUG_INFO.\n");
pp->found = 0;
while (++cu_number) {