diff options
| -rw-r--r-- | Documentation/technical/api-trace2.txt | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/Documentation/technical/api-trace2.txt b/Documentation/technical/api-trace2.txt index 80ffceada0..18b79128fd 100644 --- a/Documentation/technical/api-trace2.txt +++ b/Documentation/technical/api-trace2.txt @@ -604,7 +604,13 @@ only present on the "start" and "atexit" events. ==== Event-Specific Key/Value Pairs `"version"`:: - This event gives the version of the executable and the EVENT format. + This event gives the version of the executable and the EVENT format. It + should always be the first event in a trace session. The EVENT format + version will be incremented if new event types are added, if existing + fields are removed, or if there are significant changes in + interpretation of existing events or fields. Smaller changes, such as + adding a new field to an existing event, will not require an increment + to the EVENT format version. + ------------ { |