From 18f0707c218ebdeb6024ecffd7704d3582e0b91c Mon Sep 17 00:00:00 2001
From: Rickard Green <rickard@erlang.org>
Date: Tue, 2 Feb 2016 16:20:19 +0100
Subject: Use nano second time unit in tracing

---
 erts/doc/src/erl_driver.xml            | 5 +++--
 erts/doc/src/erlang.xml                | 9 +++++----
 erts/emulator/beam/erl_trace.c         | 3 ++-
 erts/emulator/test/trace_bif_SUITE.erl | 4 ++--
 lib/kernel/doc/src/seq_trace.xml       | 5 +++--
 5 files changed, 15 insertions(+), 11 deletions(-)

diff --git a/erts/doc/src/erl_driver.xml b/erts/doc/src/erl_driver.xml
index e338e95938..34dc8af238 100644
--- a/erts/doc/src/erl_driver.xml
+++ b/erts/doc/src/erl_driver.xml
@@ -1052,8 +1052,9 @@ typedef struct ErlIOVec {
       <desc>
         <marker id="driver_get_now"></marker>
 	<warning><p><em>This function is deprecated! Do not use it!</em>
-	Use the documented 
-	<seealso marker="#time_measurement">time measurement functionality</seealso>
+	Use <seealso marker="#erl_drv_monotonic_time"><c>erl_drv_monotonic_time()</c></seealso>
+	(perhaps in combination with
+	<seealso marker="#erl_drv_time_offset"><c>erl_drv_time_offset()</c></seealso>)
 	instead.</p></warning>
         <p>This function reads a timestamp into the memory pointed to by
           the parameter <c>now</c>. See the description of <seealso marker="#ErlDrvNowData">ErlDrvNowData</seealso> for
diff --git a/erts/doc/src/erlang.xml b/erts/doc/src/erlang.xml
index 79d3f66ea8..c9eb838230 100644
--- a/erts/doc/src/erlang.xml
+++ b/erts/doc/src/erlang.xml
@@ -7744,7 +7744,8 @@ ok
             <p>Timestamps in profile messages will use
 	    <seealso marker="time_correction#Erlang_Monotonic_Time">Erlang
 	    monotonic time</seealso>. The time-stamp (Ts) has the same
-	    format and value as produced by <c>erlang:monotonic_time()</c>.</p>
+	    format and value as produced by
+	    <c>erlang:monotonic_time(nano_seconds)</c>.</p>
           </item>
           <tag><c>runnable_procs</c></tag>
           <item>
@@ -7772,7 +7773,7 @@ ok
 	    <seealso marker="time_correction#Erlang_Monotonic_Time">Erlang
 	    monotonic time</seealso> and a monotonically increasing
 	    integer. The time-stamp (Ts) has the same format and value
-	    as produced by <c>{erlang:monotonic_time(),
+	    as produced by <c>{erlang:monotonic_time(nano_seconds),
 	    erlang:unique_integer([monotonic])}</c>.</p>
           </item>
           <tag><c>timestamp</c></tag>
@@ -8161,7 +8162,7 @@ timestamp() ->
 	    <seealso marker="time_correction#Erlang_Monotonic_Time">Erlang
 	    monotonic time</seealso> time-stamp in all trace messages. The
             time-stamp (Ts) has the same format and value as produced by
-            <c>erlang:monotonic_time()</c>. This flag overrides
+            <c>erlang:monotonic_time(nano_seconds)</c>. This flag overrides
 	    the <c>cpu_timestamp</c> flag.</p>
           </item>
           <tag><c>strict_monotonic_timestamp</c></tag>
@@ -8171,7 +8172,7 @@ timestamp() ->
 	    monotonic time</seealso> and a monotonically increasing
 	    integer in all trace messages. The time-stamp (Ts) has the
 	    same format and value as produced by
-            <c>{erlang:monotonic_time(),
+            <c>{erlang:monotonic_time(nano_seconds),
 	    erlang:unique_integer([monotonic])}</c>. This flag overrides
 	    the <c>cpu_timestamp</c> flag.</p>
           </item>
diff --git a/erts/emulator/beam/erl_trace.c b/erts/emulator/beam/erl_trace.c
index 2243639099..8a4c0ab1f2 100644
--- a/erts/emulator/beam/erl_trace.c
+++ b/erts/emulator/beam/erl_trace.c
@@ -165,7 +165,8 @@ take_timestamp(ErtsTraceTimeStamp *tsp, int ts_type)
     case ERTS_TRACE_FLG_STRICT_MONOTONIC_TIMESTAMP: {
 	Uint hsz = 0;
 	ErtsMonotonicTime mtime = erts_get_monotonic_time(NULL);
-	mtime += ERTS_MONOTONIC_OFFSET_NATIVE;
+	mtime = ERTS_MONOTONIC_TO_NSEC(mtime);
+	mtime += ERTS_MONOTONIC_OFFSET_NSEC;
 	hsz = (IS_SSMALL(mtime) ?
 	       (Uint) 0
 	       : ERTS_SINT64_HEAP_SIZE((Sint64) mtime));
diff --git a/erts/emulator/test/trace_bif_SUITE.erl b/erts/emulator/test/trace_bif_SUITE.erl
index 760666d077..96b7dd159f 100644
--- a/erts/emulator/test/trace_bif_SUITE.erl
+++ b/erts/emulator/test/trace_bif_SUITE.erl
@@ -314,9 +314,9 @@ receive_trace_msg_ts_return_to({trace_ts, Pid, return_to, {M,F,A}}, PrevTs, TsTy
 make_ts(timestamp) ->
     erlang:now();
 make_ts(monotonic_timestamp) ->
-    erlang:monotonic_time();
+    erlang:monotonic_time(nano_seconds);
 make_ts(strict_monotonic_timestamp) ->
-    MT = erlang:monotonic_time(),
+    MT = erlang:monotonic_time(nano_seconds),
     UMI = erlang:unique_integer([monotonic]),
     {MT, UMI}.
 
diff --git a/lib/kernel/doc/src/seq_trace.xml b/lib/kernel/doc/src/seq_trace.xml
index 9f191d488d..f4fcd222ec 100644
--- a/lib/kernel/doc/src/seq_trace.xml
+++ b/lib/kernel/doc/src/seq_trace.xml
@@ -136,7 +136,7 @@ seq_trace:set_token(OldToken), % activate the trace token again
 	    <seealso marker="erts:time_correction#Erlang_Monotonic_Time">Erlang
 	    monotonic time</seealso> and a monotonically increasing
 	    integer. The time-stamp has the same format and value
-	    as produced by <c>{erlang:monotonic_time(),
+	    as produced by <c>{erlang:monotonic_time(nano_seconds),
 	    erlang:unique_integer([monotonic])}</c>.</p>
           </item>
           <tag><c>set_token(monotonic_timestamp, <anno>Bool</anno>)</c></tag>
@@ -147,7 +147,8 @@ seq_trace:set_token(OldToken), % activate the trace token again
 	    will use
 	    <seealso marker="erts:time_correction#Erlang_Monotonic_Time">Erlang
 	    monotonic time</seealso>. The time-stamp has the same
-	    format and value as produced by <c>erlang:monotonic_time()</c>.</p>
+	    format and value as produced by
+	    <c>erlang:monotonic_time(nano_seconds)</c>.</p>
           </item>
 	  <p>If multiple timestamp flags are passed, <c>timestamp</c> has
 	  precedence over <c>strict_monotonic_timestamp</c> which
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