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authorArnaldo Carvalho de Melo <acme@redhat.com>2013-09-06 15:19:01 -0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2013-09-09 15:50:44 -0300
commitccf53eac2097fb47bc40875ffb22c2d10fa8c46c (patch)
tree66a3953917d06265a9bac53e71a95d9f4757f62a /tools
parent72f4a11d2fb16792f5e5107922652366194cfd66 (diff)
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perf trace: Handle perf.data files with no tracepoints
Before: perf trace -i perf.data Segmentation fault (core dumped) # After: # perf trace -i perf.data Data file does not have raw_syscalls:sys_enter events # When there are no tracepoints in a perf.data file the struct pevent that contains the list of tracepoints that will be used to lookup the tracepoint id by name will not be populated, causing a NULL deref. And we don't need to do all that dance to look at pevents for an entry with a slighly different name to then lookup the tracepoint by its id on the evlist, just use the perf_evlist__find_tracepoint_by_name() routine, that will find the tracepoint, if present. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-egcm21k1e6gcyxpcgjxtmsq3@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools')
-rw-r--r--tools/perf/util/session.c40
1 files changed, 7 insertions, 33 deletions
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 476caa129a20..0308d9ee7a77 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -1620,52 +1620,26 @@ int __perf_session__set_tracepoints_handlers(struct perf_session *session,
const struct perf_evsel_str_handler *assocs,
size_t nr_assocs)
{
- struct perf_evlist *evlist = session->evlist;
- struct event_format *format;
struct perf_evsel *evsel;
- char *tracepoint, *name;
size_t i;
int err;
for (i = 0; i < nr_assocs; i++) {
- err = -ENOMEM;
- tracepoint = strdup(assocs[i].name);
- if (tracepoint == NULL)
- goto out;
-
- err = -ENOENT;
- name = strchr(tracepoint, ':');
- if (name == NULL)
- goto out_free;
-
- *name++ = '\0';
- format = pevent_find_event_by_name(session->pevent,
- tracepoint, name);
- if (format == NULL) {
- /*
- * Adding a handler for an event not in the session,
- * just ignore it.
- */
- goto next;
- }
-
- evsel = perf_evlist__find_tracepoint_by_id(evlist, format->id);
+ /*
+ * Adding a handler for an event not in the session,
+ * just ignore it.
+ */
+ evsel = perf_evlist__find_tracepoint_by_name(session->evlist, assocs[i].name);
if (evsel == NULL)
- goto next;
+ continue;
err = -EEXIST;
if (evsel->handler.func != NULL)
- goto out_free;
+ goto out;
evsel->handler.func = assocs[i].handler;
-next:
- free(tracepoint);
}
err = 0;
out:
return err;
-
-out_free:
- free(tracepoint);
- goto out;
}