perf diff: Display data file info ahead of the diff output

Data files are referenced through the index of the file on the command
line. Adding list of data files for each index to ease up navigation for
user.

It's displayed only if in verbose mode.

Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lkml.kernel.org/n/tip-dfjxa6n116ughjjxohpkuvi8@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
index 0cfe99ea905642703cb13d6848ace4ed3bca17c6..9574ba18bc7b3d252a28e686118be9ccb1b3a66c 100644 (file)
--- a/tools/perf/builtin-diff.c
+++ b/tools/perf/builtin-diff.c
@@ -481,6 +481,21 @@ static void hists__process(struct hists *base, struct hists *new)
        hists__fprintf(base, true, 0, 0, 0, stdout);
 }
 
+static void data__fprintf(void)
+{
+       struct data__file *d;
+       int i;
+
+       fprintf(stdout, "# Data files:\n");
+
+       data__for_each_file(i, d)
+               fprintf(stdout, "#  [%d] %s %s\n",
+                       d->idx, d->file,
+                       !d->idx ? "(Baseline)" : "");
+
+       fprintf(stdout, "#\n");
+}
+
 static void data_process(void)
 {
        struct perf_evlist *evlist_old = data__files[0].session->evlist;
@@ -500,6 +515,9 @@ static void data_process(void)
 
                first = false;
 
+               if (verbose)
+                       data__fprintf();
+
                hists__process(&evsel_old->hists, &evsel_new->hists);
        }
 }