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, 8 insertions, 1 deletions

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index c1e54035e8cf..61c6d70732c9 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -54,6 +54,7 @@ static struct {
         struct perf_probe_event events[MAX_PROBES];
         struct strlist *dellist;
         struct line_range line_range;
+        int max_probe_points;
 } params;
 
 
@@ -179,6 +180,8 @@ static const struct option options[] = {
                    "file", "vmlinux pathname"),
 #endif
         OPT__DRY_RUN(&probe_event_dry_run),
+        OPT_INTEGER('\0', "max-probes", &params.max_probe_points,
+                 "Set how many probe points can be found for a probe."),
         OPT_END()
 };
 
@@ -200,6 +203,9 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
                 }
         }
 
+        if (params.max_probe_points == 0)
+                params.max_probe_points = MAX_PROBES;
+
         if ((!params.nevents && !params.dellist && !params.list_events &&
              !params.show_lines))
                 usage_with_options(probe_usage, options);
@@ -246,7 +252,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
 
         if (params.nevents) {
                 ret = add_perf_probe_events(params.events, params.nevents,
-                                            params.force_add);
+                                            params.force_add,
+                                            params.max_probe_points);
                 if (ret < 0) {
                         pr_err("  Error: Failed to add events. (%d)\n", ret);
                         return ret;