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[tip:perf/urgent] perf probe: Fix to show which probe point is not found
- From: tip-bot for Masami Hiramatsu <mhiramat at redhat dot com>
- To: linux-tip-commits at vger dot kernel dot org
- Cc: acme at redhat dot com, mingo at redhat dot com, peterz at infradead dot org, fweisbec at gmail dot com, dle-develop at lists dot sourceforge dot net, rostedt at goodmis dot org, jbaron at redhat dot com, tglx at linutronix dot de, mhiramat at redhat dot com, systemtap at sources dot redhat dot com, linux-kernel at vger dot kernel dot org, hpa at zytor dot com, paulus at samba dot org, fche at redhat dot com, jkenisto at us dot ibm dot com, hch at infradead dot org, ananth at in dot ibm dot com, srikar at linux dot vnet dot ibm dot com, mingo at elte dot hu, prasad at linux dot vnet dot ibm dot com
- Date: Tue, 15 Dec 2009 19:27:49 GMT
- Subject: [tip:perf/urgent] perf probe: Fix to show which probe point is not found
- Git-commit-id: 7ef17aafc98406d01ebbf7fe98ef1332b70d20bb
- References: <20091215153247.17436.49068.stgit@dhcp-100-2-132.bos.redhat.com>
- Reply-to: mingo at redhat dot com, acme at redhat dot com, peterz at infradead dot org, fweisbec at gmail dot com, dle-develop at lists dot sourceforge dot net, rostedt at goodmis dot org, jbaron at redhat dot com, tglx at linutronix dot de, mhiramat at redhat dot com, systemtap at sources dot redhat dot com, linux-kernel at vger dot kernel dot org, hpa at zytor dot com, paulus at samba dot org, fche at redhat dot com, jkenisto at us dot ibm dot com, hch at infradead dot org, ananth at in dot ibm dot com, srikar at linux dot vnet dot ibm dot com, prasad at linux dot vnet dot ibm dot com, mingo at elte dot hu
Commit-ID: 7ef17aafc98406d01ebbf7fe98ef1332b70d20bb
Gitweb: http://git.kernel.org/tip/7ef17aafc98406d01ebbf7fe98ef1332b70d20bb
Author: Masami Hiramatsu <mhiramat@redhat.com>
AuthorDate: Tue, 15 Dec 2009 10:32:47 -0500
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Tue, 15 Dec 2009 20:22:05 +0100
perf probe: Fix to show which probe point is not found
Fix perf probe to show which probe point is not found.
With out this patch, it shows just "No probe point found."
This doesn't help users if they specify several probes.
e.g.
# perf probe -f --add schedule --add test
Fatal: No probe point found.
This patch makes error message more helpful as below.
# perf probe --add schedule --add test
Fatal: Probe point 'test' not found. - probe not added.
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.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>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091215153247.17436.49068.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---
tools/perf/builtin-probe.c | 7 +++++--
tools/perf/util/probe-event.c | 34 ++++++++++++++++++++++++----------
tools/perf/util/probe-event.h | 1 +
3 files changed, 30 insertions(+), 12 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 6b0e4cf..520b064 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -265,8 +265,11 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
ret = find_probepoint(fd, pp);
if (ret > 0)
continue;
- if (ret == 0) /* No error but failed to find probe point. */
- die("No probe point found.");
+ if (ret == 0) { /* No error but failed to find probe point. */
+ synthesize_perf_probe_point(pp);
+ die("Probe point '%s' not found. - probe not added.",
+ pp->probes[0]);
+ }
/* Error path */
if (session.need_dwarf) {
if (ret == -ENOENT)
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index b05d532..2ca6215 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -249,11 +249,12 @@ void parse_trace_kprobe_event(const char *str, struct probe_point *pp)
argv_free(argv);
}
-int synthesize_perf_probe_event(struct probe_point *pp)
+/* Synthesize only probe point (not argument) */
+int synthesize_perf_probe_point(struct probe_point *pp)
{
char *buf;
char offs[64] = "", line[64] = "";
- int i, len, ret;
+ int ret;
pp->probes[0] = buf = zalloc(MAX_CMDLEN);
if (!buf)
@@ -274,10 +275,24 @@ int synthesize_perf_probe_event(struct probe_point *pp)
offs, pp->retprobe ? "%return" : "", line);
else
ret = e_snprintf(buf, MAX_CMDLEN, "%s%s", pp->file, line);
- if (ret <= 0)
- goto error;
- len = ret;
+ if (ret <= 0) {
+error:
+ free(pp->probes[0]);
+ pp->probes[0] = NULL;
+ }
+ return ret;
+}
+
+int synthesize_perf_probe_event(struct probe_point *pp)
+{
+ char *buf;
+ int i, len, ret;
+ len = synthesize_perf_probe_point(pp);
+ if (len < 0)
+ return 0;
+
+ buf = pp->probes[0];
for (i = 0; i < pp->nr_args; i++) {
ret = e_snprintf(&buf[len], MAX_CMDLEN - len, " %s",
pp->args[i]);
@@ -290,6 +305,7 @@ int synthesize_perf_probe_event(struct probe_point *pp)
return pp->found;
error:
free(pp->probes[0]);
+ pp->probes[0] = NULL;
return ret;
}
@@ -319,6 +335,7 @@ int synthesize_trace_kprobe_event(struct probe_point *pp)
return pp->found;
error:
free(pp->probes[0]);
+ pp->probes[0] = NULL;
return ret;
}
@@ -418,7 +435,7 @@ static void show_perf_probe_event(const char *event, const char *place,
/* List up current perf-probe events */
void show_perf_probe_events(void)
{
- int fd, nr;
+ int fd;
struct probe_point pp;
struct strlist *rawlist;
struct str_node *ent;
@@ -430,10 +447,7 @@ void show_perf_probe_events(void)
strlist__for_each(ent, rawlist) {
parse_trace_kprobe_event(ent->s, &pp);
/* Synthesize only event probe point */
- nr = pp.nr_args;
- pp.nr_args = 0;
- synthesize_perf_probe_event(&pp);
- pp.nr_args = nr;
+ synthesize_perf_probe_point(&pp);
/* Show an event */
show_perf_probe_event(pp.event, pp.probes[0], &pp);
clear_probe_point(&pp);
diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h
index 8fd3052..7f1d499 100644
--- a/tools/perf/util/probe-event.h
+++ b/tools/perf/util/probe-event.h
@@ -7,6 +7,7 @@
extern void parse_perf_probe_event(const char *str, struct probe_point *pp,
bool *need_dwarf);
+extern int synthesize_perf_probe_point(struct probe_point *pp);
extern int synthesize_perf_probe_event(struct probe_point *pp);
extern void parse_trace_kprobe_event(const char *str, struct probe_point *pp);
extern int synthesize_trace_kprobe_event(struct probe_point *pp);