diff options
author | Masami Hiramatsu <mhiramat@redhat.com> | 2009-12-15 16:32:25 +0100 |
---|---|---|
committer | Ingo Molnar <mingo@elte.hu> | 2009-12-15 20:22:04 +0100 |
commit | d761b08bff0a9b653f6bd248cea50322e7eccb14 (patch) | |
tree | ec57220663387ceb65a6e34c78f80c2998ee64e6 /tools/perf/util/probe-event.c | |
parent | perf probe: Support event name for --add option (diff) | |
download | linux-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.c | 24 |
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. */ |