[sysprof/wip/visualizers] sysprof-dump: print relative time for samples

[Christian Hergert <chergert src gnome org>]

commit bc154617a31c717d46adcb86a3b52d8744961231
Author: Christian Hergert <chergert redhat com>
Date:   Sat Oct 8 20:30:06 2016 -0700

    sysprof-dump: print relative time for samples
    
    This can be handy to quickly look at the relative time using
    a double as the time.

 tools/sysprof-dump.c |    8 +++++++-
 1 files changed, 7 insertions(+), 1 deletions(-)
---
diff --git a/tools/sysprof-dump.c b/tools/sysprof-dump.c
index e5633c6..8c1c674 100644
--- a/tools/sysprof-dump.c
+++ b/tools/sysprof-dump.c
@@ -21,6 +21,8 @@
 
 #include "sp-capture-reader.h"
 
+#define NSEC_PER_SEC G_GINT64_CONSTANT(1000000000)
+
 gint
 main (gint argc,
       gchar *argv[])
@@ -29,6 +31,7 @@ main (gint argc,
   SpCaptureFrameType type;
   GHashTable *ctrtypes;
   GError *error = NULL;
+  gint64 begin_time;
 
   if (argc != 2)
     {
@@ -39,6 +42,8 @@ main (gint argc,
   reader = sp_capture_reader_new (argv[1], &error);
   ctrtypes = g_hash_table_new (NULL, NULL);
 
+  begin_time = sp_capture_reader_get_start_time (reader);
+
 #define SET_CTR_TYPE(i,t) g_hash_table_insert(ctrtypes, GINT_TO_POINTER(i), GINT_TO_POINTER(t))
 #define GET_CTR_TYPE(i) GPOINTER_TO_INT(g_hash_table_lookup(ctrtypes, GINT_TO_POINTER(i)))
 
@@ -126,9 +131,10 @@ main (gint argc,
         case SP_CAPTURE_FRAME_SAMPLE:
           {
             const SpCaptureSample *s =  sp_capture_reader_read_sample (reader);
+            gdouble ptime = (s->frame.time - begin_time) / (gdouble)NSEC_PER_SEC;
             guint i;
 
-            g_print ("SAMPLE: pid=%d time=%"G_GINT64_FORMAT"\n", s->frame.pid, s->frame.time);
+            g_print ("SAMPLE: pid=%d time=%"G_GINT64_FORMAT" (%lf)\n", s->frame.pid, s->frame.time, ptime);
 
             for (i = 0; i < s->n_addrs; i++)
               g_print ("  "SP_CAPTURE_ADDRESS_FORMAT"\n", s->addrs[i]);