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authorMasami Hiramatsu <mhiramat@redhat.com>2009-12-15 16:32:25 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-15 20:22:04 +0100
commitd761b08bff0a9b653f6bd248cea50322e7eccb14 (patch)
treeec57220663387ceb65a6e34c78f80c2998ee64e6 /tools/perf/util/probe-event.c
parentperf probe: Support event name for --add option (diff)
downloadlinux-d761b08bff0a9b653f6bd248cea50322e7eccb14.tar.xz
linux-d761b08bff0a9b653f6bd248cea50322e7eccb14.zip
perf probe: Reject second attempt of adding same-name event
Reject second attempt of adding same-name event. This patch also provides --force option which allows user to add additional probe events on the same-name event. e.g. (the first attempt : success) ./perf probe schedule Added new event: probe:schedule (on schedule+0) (the second attempt : failure) ./perf probe schedule:11 Error: event "schedule" already exists. (Use -f to force duplicates.) Fatal: Can't add new event. (the second attempt with -f : successfully added) ./perf probe -f schedule:11 Added new event: probe:schedule_1 (on schedule+45) 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: <20091215153225.17436.15166.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/util/probe-event.c')
-rw-r--r--tools/perf/util/probe-event.c24
1 files changed, 21 insertions, 3 deletions
diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 3b4cf456165c..b05d532a4e4c 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -482,7 +482,7 @@ static void write_trace_kprobe_event(int fd, const char *buf)
}
static void get_new_event_name(char *buf, size_t len, const char *base,
- struct strlist *namelist)
+ struct strlist *namelist, bool allow_suffix)
{
int i, ret;
@@ -493,6 +493,12 @@ static void get_new_event_name(char *buf, size_t len, const char *base,
if (!strlist__has_entry(namelist, buf))
return;
+ if (!allow_suffix) {
+ pr_warning("Error: event \"%s\" already exists. "
+ "(Use -f to force duplicates.)\n", base);
+ die("Can't add new event.");
+ }
+
/* Try to add suffix */
for (i = 1; i < MAX_EVENT_INDEX; i++) {
ret = e_snprintf(buf, len, "%s_%d", base, i);
@@ -505,13 +511,15 @@ static void get_new_event_name(char *buf, size_t len, const char *base,
die("Too many events are on the same function.");
}
-void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
+void add_trace_kprobe_events(struct probe_point *probes, int nr_probes,
+ bool force_add)
{
int i, j, fd;
struct probe_point *pp;
char buf[MAX_CMDLEN];
char event[64];
struct strlist *namelist;
+ bool allow_suffix;
fd = open_kprobe_events(O_RDWR, O_APPEND);
/* Get current event names */
@@ -524,9 +532,12 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
if (!pp->group)
pp->group = strdup(PERFPROBE_GROUP);
DIE_IF(!pp->event || !pp->group);
+ /* If force_add is true, suffix search is allowed */
+ allow_suffix = force_add;
for (i = 0; i < pp->found; i++) {
/* Get an unused new event name */
- get_new_event_name(event, 64, pp->event, namelist);
+ get_new_event_name(event, 64, pp->event, namelist,
+ allow_suffix);
snprintf(buf, MAX_CMDLEN, "%c:%s/%s %s\n",
pp->retprobe ? 'r' : 'p',
pp->group, event,
@@ -538,6 +549,13 @@ void add_trace_kprobe_events(struct probe_point *probes, int nr_probes)
show_perf_probe_event(event, buf, pp);
/* Add added event name to namelist */
strlist__add(namelist, event);
+ /*
+ * Probes after the first probe which comes from same
+ * user input are always allowed to add suffix, because
+ * there might be several addresses corresponding to
+ * one code line.
+ */
+ allow_suffix = true;
}
}
/* Show how to use the event. */