Add members to LttTrace to support time adjustments

[lttv.git] / ltt / tracefile.c

diff --git a/ltt/tracefile.c b/ltt/tracefile.c
index d61f4af879f2425ef243abc63549dbdbd6e5b848..2ac0fa5865a15a1ef10acf234045c95c935992ca 100644 (file)
--- a/ltt/tracefile.c
+++ b/ltt/tracefile.c
@@ -80,8 +80,6 @@ GQuark LTT_TRACEFILE_NAME_METADATA;
 #define PAGE_MASK (~(page_size-1))
 #define PAGE_ALIGN(addr)  (((addr)+page_size-1)&PAGE_MASK)
 
-LttTrace *father_trace = NULL;
-
 /* set the offset of the fields belonging to the event,
    need the information of the archecture */
 //void set_fields_offsets(LttTracefile *tf, LttEventType *event_type);
@@ -164,12 +162,6 @@ static int parse_trace_header(ltt_subbuffer_header_t *header,
                                          &vheader->start_freq);
           t->freq_scale = ltt_get_uint32(LTT_GET_BO(tf),
                                          &vheader->freq_scale);
-          if(father_trace) {
-            t->start_freq = father_trace->start_freq;
-            t->freq_scale = father_trace->freq_scale;
-          } else {
-            father_trace = t;
-          }
           t->start_tsc = ltt_get_uint64(LTT_GET_BO(tf),
                                         &vheader->cycle_count_begin);
           t->start_monotonic = 0;
@@ -179,10 +171,9 @@ static int parse_trace_header(ltt_subbuffer_header_t *header,
                                        &vheader->start_time_usec);
           t->start_time.tv_nsec *= 1000; /* microsec to nanosec */
 
-          t->start_time_from_tsc = ltt_time_from_uint64(
-              (double)t->start_tsc
-              * 1000000000.0 * tf->trace->freq_scale
-              / (double)t->start_freq);
+         t->start_time_from_tsc =
+                 ltt_time_from_uint64(tsc_to_uint64(t->freq_scale,
+                                 t->start_freq, t->start_tsc));
         }
       }
       break;
@@ -880,6 +871,8 @@ LttTrace *ltt_trace_open(const gchar *pathname)
   g_assert(!ret);
 
   t->num_cpu = group->len;
+  t->drift = 1.;
+  t->offset = 0.;
   
   //ret = allocate_marker_data(t);
   //if (ret)
@@ -1162,28 +1155,22 @@ fail:
   return 1;
 }
 
+/*
+ * Convert a value in "TSC scale" to a value in nanoseconds
+ */
+guint64 tsc_to_uint64(guint32 freq_scale, uint64_t start_freq, guint64 tsc)
+{
+       return (double) tsc * NANOSECONDS_PER_SECOND * freq_scale / start_freq;
+}
+
 /* Given a TSC value, return the LttTime (seconds,nanoseconds) it
  * corresponds to.
  */
-
 LttTime ltt_interpolate_time_from_tsc(LttTracefile *tf, guint64 tsc)
 {
-  LttTime time;
-  
-  if(tsc > tf->trace->start_tsc) {
-    time = ltt_time_from_uint64(
-        (double)(tsc - tf->trace->start_tsc) 
-                                    * 1000000000.0 * tf->trace->freq_scale
-                                    / (double)tf->trace->start_freq);
-    time = ltt_time_add(tf->trace->start_time_from_tsc, time);
-  } else {
-    time = ltt_time_from_uint64(
-        (double)(tf->trace->start_tsc - tsc)
-                                    * 1000000000.0 * tf->trace->freq_scale
-                                    / (double)tf->trace->start_freq);
-    time = ltt_time_sub(tf->trace->start_time_from_tsc, time);
-  }
-  return time;
+       return ltt_time_from_uint64(tsc_to_uint64(tf->trace->freq_scale,
+                       tf->trace->start_freq, tf->trace->drift * tsc +
+                       tf->trace->offset));
 }
 
 /* Calculate the real event time based on the buffer boundaries */