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Diffstat (limited to 'docs/tracing.txt')
| -rw-r--r-- | docs/tracing.txt | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt index 95ca16c05d..ea29f2c222 100644 --- a/docs/tracing.txt +++ b/docs/tracing.txt @@ -132,12 +132,19 @@ This functionality is also provided through monitor commands: means disabled. * trace-event NAME on|off - Enable/disable a given trace event. + Enable/disable a given trace event or a group of events having common prefix + through wildcard. The "-trace events=<file>" command line argument can be used to enable the events listed in <file> from the very beginning of the program. This file must contain one event name per line. +A basic wildcard matching is supported in both the monitor command "trace +-event" and the events list file. That means you can enable/disable the events +having a common prefix in a batch. For example, virtio-blk trace events could +be enabled using: + trace-event virtio_blk_* on + == Trace backends == The "tracetool" script automates tedious trace event code generation and also |