From 7ef17aafc98406d01ebbf7fe98ef1332b70d20bb Mon Sep 17 00:00:00 2001 From: Masami Hiramatsu Date: Tue, 15 Dec 2009 10:32:47 -0500 Subject: 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 Cc: Paul Mackerras Cc: Arnaldo Carvalho de Melo Cc: Steven Rostedt Cc: Jim Keniston Cc: Ananth N Mavinakayanahalli Cc: Christoph Hellwig Cc: Frank Ch. Eigler Cc: Jason Baron Cc: K.Prasad Cc: Peter Zijlstra Cc: Srikar Dronamraju Cc: systemtap Cc: DLE Cc: Frederic Weisbecker LKML-Reference: <20091215153247.17436.49068.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar --- 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(-) (limited to 'tools') diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c index 6b0e4cf322d8..520b064b46d8 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 b05d532a4e4c..2ca62154f79b 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 8fd30525100c..7f1d499118c0 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); -- cgit v1.2.2