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authorRickard Green <[email protected]>2016-01-05 16:55:04 +0100
committerRickard Green <[email protected]>2016-01-20 11:10:37 +0100
commit858c6f7fa44f7b2dc363b359198d6522dd60e914 (patch)
treefdad35b9a7a9904d7dc4586aced86c79fb46a78c /lib/kernel/doc
parentdf18cd270ad682cedc8c21990641b0bdb8788092 (diff)
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Introduce time warp safe trace timestamp formats
New timestamp options for trace, sequential trace, and system profile: - monotonic_timestamp - strict_monotonic_timestamp
Diffstat (limited to 'lib/kernel/doc')
-rw-r--r--lib/kernel/doc/src/seq_trace.xml28
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/kernel/doc/src/seq_trace.xml b/lib/kernel/doc/src/seq_trace.xml
index 3439111035..9f191d488d 100644
--- a/lib/kernel/doc/src/seq_trace.xml
+++ b/lib/kernel/doc/src/seq_trace.xml
@@ -127,6 +127,34 @@ seq_trace:set_token(OldToken), % activate the trace token again
enables/disables a timestamp to be generated for each
traced event. Default is <c>false</c>.</p>
</item>
+ <tag><c>set_token(strict_monotonic_timestamp, <anno>Bool</anno>)</c></tag>
+ <item>
+ <p>A trace token flag (<c>true | false</c>) which
+ enables/disables a strict monotonic timestamp to be generated
+ for each traced event. Default is <c>false</c>. Timestamps will
+ consist of
+ <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(),
+ erlang:unique_integer([monotonic])}</c>.</p>
+ </item>
+ <tag><c>set_token(monotonic_timestamp, <anno>Bool</anno>)</c></tag>
+ <item>
+ <p>A trace token flag (<c>true | false</c>) which
+ enables/disables a strict monotonic timestamp to be generated
+ for each traced event. Default is <c>false</c>. Timestamps
+ 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>
+ </item>
+ <p>If multiple timestamp flags are passed, <c>timestamp</c> has
+ precedence over <c>strict_monotonic_timestamp</c> which
+ in turn has precedence over <c>monotonic_timestamp</c>. All
+ timestamp flags are remembered, so if two are passed
+ and the one with highest precedence later is disabled
+ the other one will become active.</p>
</taglist>
</desc>
</func>