diff --git a/tools/trace-malloc/spacetrace.c b/tools/trace-malloc/spacetrace.c
index cb3d578c4b3..e3a6586a88b 100644
--- a/tools/trace-malloc/spacetrace.c
+++ b/tools/trace-malloc/spacetrace.c
@@ -245,6 +245,26 @@ int showHelp(void)
     return retval;
 }
 
+/*
+** ticks2msec
+**
+** Convert platform specific ticks to msec time
+** Returns 0 on success.
+*/
+PRUint32 ticks2msec(tmreader* aReader, PRUint32 aTicks)
+{
+    PRUint32 retval = 0;
+    PRUint64 bigone = LL_INIT(0, 1000);
+    PRUint64 tmp64;
+
+    LL_UI2L(tmp64, aTicks);
+    LL_MUL(bigone, bigone, tmp64);
+    LL_UI2L(tmp64, aReader->ticksPerSec);
+    LL_DIV(bigone, bigone, tmp64);
+    LL_L2UI(retval, bigone);
+    return retval;
+}
+
 /*
 ** initOptions
 **
@@ -2222,7 +2242,7 @@ void tmEventHandler(tmreader* aReader, tmevent* aEvent)
                         {
                             eventType = TM_EVENT_FREE;
                         }
-                        trackEvent(aEvent->u.alloc.interval, eventType, callsite, aEvent->u.alloc.ptr, aEvent->u.alloc.size, oldcallsite, oldptr, oldsize);
+                        trackEvent(ticks2msec(aReader, aEvent->u.alloc.interval), eventType, callsite, aEvent->u.alloc.ptr, aEvent->u.alloc.size, oldcallsite, oldptr, oldsize);
                     }
                 }
                 else
diff --git a/tools/trace-malloc/tmreader.c b/tools/trace-malloc/tmreader.c
index da0a2231eaa..c493308ccef 100644
--- a/tools/trace-malloc/tmreader.c
+++ b/tools/trace-malloc/tmreader.c
@@ -43,6 +43,7 @@
 #endif
 #include "prlog.h"
 #include "plhash.h"
+#include "prnetdb.h"
 #include "nsTraceMalloc.h"
 #include "tmreader.h"
 
@@ -169,6 +170,8 @@ static int get_tmevent(FILE *fp, tmevent *event)
       case TM_EVENT_FREE:
         if (!get_uint32(fp, &event->u.alloc.interval))
             return 0;
+        if (!get_uint32(fp, &event->u.alloc.cost))
+            return 0;
         if (!get_uint32(fp, &event->u.alloc.ptr))
             return 0;
         if (!get_uint32(fp, &event->u.alloc.size))
@@ -176,11 +179,24 @@ static int get_tmevent(FILE *fp, tmevent *event)
         event->u.alloc.oldserial = 0;
         event->u.alloc.oldptr = 0;
         event->u.alloc.oldsize = 0;
+#if defined(DEBUG_dp)
+        if (c == TM_EVENT_MALLOC)
+            printf("%d malloc %d 0x%p\n", event->u.alloc.cost,
+                   event->u.alloc.size, event->u.alloc.ptr);
+        else if (c == TM_EVENT_CALLOC)
+            printf("%d calloc %d 0x%p\n", event->u.alloc.cost,
+                   event->u.alloc.size, event->u.alloc.ptr);
+        else
+            printf("%d free %d 0x%p\n", event->u.alloc.cost,
+                   event->u.alloc.size, event->u.alloc.ptr);
+#endif
         break;
 
       case TM_EVENT_REALLOC:
         if (!get_uint32(fp, &event->u.alloc.interval))
             return 0;
+        if (!get_uint32(fp, &event->u.alloc.cost))
+            return 0;
         if (!get_uint32(fp, &event->u.alloc.ptr))
             return 0;
         if (!get_uint32(fp, &event->u.alloc.size))
@@ -191,6 +207,10 @@ static int get_tmevent(FILE *fp, tmevent *event)
             return 0;
         if (!get_uint32(fp, &event->u.alloc.oldsize))
             return 0;
+#if defined(DEBUG_dp)
+        printf("%d realloc %d 0x%p %d\n", event->u.alloc.cost,
+               event->u.alloc.size, event->u.alloc.ptr, event->u.alloc.oldsize);
+#endif
         break;
 
       case TM_EVENT_STATS:
@@ -391,6 +411,16 @@ int tmreader_eventloop(tmreader *tmr, const char *filename,
         return 0;
     }
 
+    /* Read in ticks per second. Used to convert platform specific intervals to time values */
+    if (read(fileno(fp), &tmr->ticksPerSec, sizeof tmr->ticksPerSec) != sizeof tmr->ticksPerSec) {
+        fprintf(stderr, "%s: Cannot read ticksPerSec. Log file read error.\n",
+                tmr->program);
+        return 0;
+    }
+    tmr->ticksPerSec = PR_ntohl(tmr->ticksPerSec);
+#ifdef DEBUG_dp
+    printf("DEBUG: ticks per sec = %d\n", tmr->ticksPerSec);
+#endif
     while (get_tmevent(fp, &event)) {
         switch (event.type) {
           case TM_EVENT_LIBRARY: {
diff --git a/tools/trace-malloc/tmreader.h b/tools/trace-malloc/tmreader.h
index 3e0ba94ce56..23a3e2f0bca 100644
--- a/tools/trace-malloc/tmreader.h
+++ b/tools/trace-malloc/tmreader.h
@@ -65,12 +65,13 @@ struct tmevent {
             uint32  offset;
         } site;
         struct {
-            uint32  interval;
+            uint32  interval; /* in ticks */
             uint32  ptr;
             uint32  size;
             uint32  oldserial;
             uint32  oldptr;
             uint32  oldsize;
+            uint32  cost;     /* in ticks */
         } alloc;
         struct {
             nsTMStats tmstats;
@@ -155,6 +156,7 @@ struct tmreader {
     PLHashTable     *methods;
     PLHashTable     *callsites;
     tmcallsite      calltree_root;
+    uint32          ticksPerSec;
 };
 
 typedef void (*tmeventhandler)(tmreader *tmr, tmevent *event);