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Diffstat (limited to 'docs/tracing.txt')
| -rw-r--r-- | docs/tracing.txt | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/docs/tracing.txt b/docs/tracing.txt index c541133368..453cc4a63d 100644 --- a/docs/tracing.txt +++ b/docs/tracing.txt @@ -139,6 +139,10 @@ having a common prefix in a batch. For example, virtio-blk trace events could be enabled using: trace-event virtio_blk_* on +If a line in the "-trace events=<file>" file begins with a '-', the trace event +will be disabled instead of enabled. This is useful when a wildcard was used +to enable an entire family of events but one noisy event needs to be disabled. + == Trace backends == The "tracetool" script automates tedious trace event code generation and also @@ -185,15 +189,6 @@ records the char* pointer value instead of the string that is pointed to. ==== Monitor commands ==== -* info trace - Display the contents of trace buffer. This command dumps the trace buffer - with simple formatting. For full pretty-printing, use the simpletrace.py - script on a binary trace file. - - The trace buffer is written into until full. The full trace buffer is - flushed and emptied. This means the 'info trace' will display few or no - entries if the buffer has just been flushed. - * trace-file on|off|flush|set <path> Enable/disable/flush the trace file or set the trace file name. |