perf tools: Add AUX area tracing index

Add an index of AUX area tracing events within a perf.data file.

perf record uses a special user event PERF_RECORD_FINISHED_ROUND to
enable sorting of events in chunks instead of having to sort all events
altogether.

AUX area tracing events contain data that can span back to the very
beginning of the recording period. i.e. they do not obey the rules of
PERF_RECORD_FINISHED_ROUND.

By adding an index, AUX area tracing events can be found in advance and
the PERF_RECORD_FINISHED_ROUND approach works as usual.

The index is recorded with the auxtrace feature in the perf.data file.
A session reads the index but does not process it.  An AUX area decoder
can queue all the AUX area data in advance using
auxtrace_queues__process_index() or otherwise process the index in some
custom manner.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1430404667-10593-3-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 15 insertions, 0 deletions

diff --git a/tools/perf/builtin-inject.c b/tools/perf/builtin-inject.c
index c5f6515f0723..6d4bbde066fd 100644
--- a/tools/perf/builtin-inject.c
+++ b/tools/perf/builtin-inject.c
@@ -122,6 +122,18 @@ static s64 perf_event__repipe_auxtrace(struct perf_tool *tool,
                                                   tool);
         int ret;
 
+        if (!inject->output.is_pipe) {
+                off_t offset;
+
+                offset = lseek(inject->output.fd, 0, SEEK_CUR);
+                if (offset == -1)
+                        return -errno;
+                ret = auxtrace_index__auxtrace_event(&session->auxtrace_index,
+                                                     event, offset);
+                if (ret < 0)
+                        return ret;
+        }
+
         if (perf_data_file__is_pipe(session->file) || !session->one_mmap) {
                 ret = output_bytes(inject, event, event->header.size);
                 if (ret < 0)
@@ -487,6 +499,9 @@ static int __cmd_inject(struct perf_inject *inject)
                 output_data_offset = 4096;
         }
 
+        if (!inject->itrace_synth_opts.set)
+                auxtrace_index__free(&session->auxtrace_index);
+
         if (!file_out->is_pipe)
                 lseek(fd, output_data_offset, SEEK_SET);