[RFC PATCH 2/2] perf: add support for trace-cmd plugins

[David Ahern <dsahern@gmail.com>]

Improves pretty printing of events when using perf-script. e.g.,
perf record -p 8731 -e kvm:* -fo /tmp/perf.data -- sleep 1

Currently when dumping kvm events you ugliness like this:
$ perf script -i /tmp/perf.data
Warning: bad op token {
Warning: failed to read event print fmt for kvm_emulate_insn
...
        qemu-kvm  8734 [006] 826443.468554: kvm_emulate_insn:
<...>-8734  [006]     0.000000000: kvm_emulate_insn:
[FAILED TO PARSE] rip=18446744071579001937 csbase=0 len=6
insn=<89><B7> flags=9 failed=0

Ignoring the duplication of data the event is not readable.
With this patch and using the kvm plugin for trace-cmd you get:

        qemu-kvm  8734 [006] 826443.468554: kvm_emulate_insn:
0:ffffffff81026451: mov %esi, 0xff5fb000(%rdi)

which is a bit more readable.

Signed-off-by: David Ahern <dsahern@gmail.com>
---
 tools/perf/util/trace-event-parse.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/tools/perf/util/trace-event-parse.c b/tools/perf/util/trace-event-parse.c
index df2fddb..7b149c5 100644
--- a/tools/perf/util/trace-event-parse.c
+++ b/tools/perf/util/trace-event-parse.c
@@ -27,6 +27,7 @@
 #include "../perf.h"
 #include "util.h"
 #include "trace-event.h"
+#include "tracecmd-plugins.h"
 
 int header_page_size_size;
 int header_page_ts_size;
@@ -36,6 +37,7 @@ struct pevent *perf_pevent;
 static struct pevent *pevent;
 
 bool latency_format;
+struct plugin_list *list;
 
 int read_trace_init(int file_bigendian, int host_bigendian)
 {
@@ -45,6 +47,8 @@ int read_trace_init(int file_bigendian, int host_bigendian)
 	perf_pevent = pevent_alloc();
 	pevent = perf_pevent;
 
+	list = tracecmd_load_plugins(pevent);
+
 	pevent_set_flag(pevent, PEVENT_NSEC_OUTPUT);
 	pevent_set_file_bigendian(pevent, file_bigendian);
 	pevent_set_host_bigendian(pevent, host_bigendian);
-- 
1.7.10.1