perf probe: Add --max-probes option

Add --max-probes option to change the maximum limit of
findable probe points per event, since inlined function can be
expanded into thousands of probe points. Default value is 128.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Suggested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
LKML-Reference: <20100421195640.24664.62984.stgit@localhost6.localdomain6>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 10 insertions, 7 deletions

diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c
index 5d3baec216e3..9ded38ced234 100644
--- a/tools/perf/util/probe-event.c
+++ b/tools/perf/util/probe-event.c
@@ -150,7 +150,8 @@ static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
 
 /* Try to find perf_probe_event with debuginfo */
 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
-                                           struct kprobe_trace_event **tevs)
+                                           struct kprobe_trace_event **tevs,
+                                           int max_tevs)
 {
         bool need_dwarf = perf_probe_event_need_dwarf(pev);
         int fd, ntevs;
@@ -166,7 +167,7 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
         }
 
         /* Searching trace events corresponding to probe event */
-        ntevs = find_kprobe_trace_events(fd, pev, tevs);
+        ntevs = find_kprobe_trace_events(fd, pev, tevs, max_tevs);
         close(fd);
 
         if (ntevs > 0) {        /* Succeeded to find trace events */
@@ -318,7 +319,8 @@ static int convert_to_perf_probe_point(struct kprobe_trace_point *tp,
 }
 
 static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev,
-                                struct kprobe_trace_event **tevs __unused)
+                                struct kprobe_trace_event **tevs __unused,
+                                int max_tevs __unused)
 {
         if (perf_probe_event_need_dwarf(pev)) {
                 pr_warning("Debuginfo-analysis is not supported.\n");
@@ -1408,14 +1410,15 @@ static int __add_kprobe_trace_events(struct perf_probe_event *pev,
 }
 
 static int convert_to_kprobe_trace_events(struct perf_probe_event *pev,
-                                          struct kprobe_trace_event **tevs)
+                                          struct kprobe_trace_event **tevs,
+                                          int max_tevs)
 {
         struct symbol *sym;
         int ret = 0, i;
         struct kprobe_trace_event *tev;
 
         /* Convert perf_probe_event with debuginfo */
-        ret = try_to_find_kprobe_trace_events(pev, tevs);
+        ret = try_to_find_kprobe_trace_events(pev, tevs, max_tevs);
         if (ret != 0)
                 return ret;
 
@@ -1487,7 +1490,7 @@ struct __event_package {
 };
 
 int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
-                          bool force_add)
+                          bool force_add, int max_tevs)
 {
         int i, j, ret;
         struct __event_package *pkgs;
@@ -1506,7 +1509,7 @@ int add_perf_probe_events(struct perf_probe_event *pevs, int npevs,
                 pkgs[i].pev = &pevs[i];
                 /* Convert with or without debuginfo */
                 ret  = convert_to_kprobe_trace_events(pkgs[i].pev,
-                                                      &pkgs[i].tevs);
+                                                      &pkgs[i].tevs, max_tevs);
                 if (ret < 0)
                         goto end;
                 pkgs[i].ntevs = ret;