-\-\-loglevel NAME
- Tracepoint loglevel range from 0 to loglevel. Listed in the help (\-h).
-\-\-loglevel-only NAME
- Tracepoint loglevel (only this loglevel).
-
- The loglevel or loglevel-only options should be combined with a
- tracepoint name or tracepoint wildcard.
-\-\-probe [addr | symbol | symbol+offset]
- Dynamic probe. Addr and offset can be octal (0NNN...), decimal (NNN...)
- or hexadecimal (0xNNN...)
-\-\-function [addr | symbol | symbol+offset]
- Dynamic function entry/return probe. Addr and offset can be octal
- (0NNN...), decimal (NNN...) or hexadecimal (0xNNN...)
-\-\-syscall
- System call event. Enabling syscalls tracing (kernel tracer), you will
- not be able to disable them with disable-event. This is a known
- limitation. You can disable the entire channel to do the trick.
-
-\-\-filter 'expression'
- Set a filter on a newly enabled event. Filter expression on event
- fields and context. Event recording depends on evaluation. Only
- specify on first activation of a given event within a session.
- Filter only allowed when enabling events within a session before
- tracing is started. If the filter fails to link with the event
- within the traced domain, the event will be discarded.
- Currently, filter is only implemented for the user-space tracer.
-
- Expression examples:
-
- 'intfield > 500 && intfield < 503'
- '(stringfield == "test" || intfield != 10) && intfield > 33'
- 'doublefield > 1.1 && intfield < 5.3'
-
- Wildcards are allowed at the end of strings:
- 'seqfield1 == "te*"'
- In string literals, the escape character is a '\\'. Use '\\*' for
- the '*' character, and '\\\\' for the '\\' character. Wildcard
- match any sequence of characters, including an empty sub-string
- (match 0 or more characters).
-
- Context information can be used for filtering. The examples
- below show usage of context filtering on process name (with a
- wildcard), process ID range, and unique thread ID for filtering.
- The process and thread ID of running applications can be found
- under columns "PID" and "LWP" of the "ps -eLf" command.
-
- '$ctx.procname == "demo*"'
- '$ctx.vpid >= 4433 && $ctx.vpid < 4455'
- '$ctx.vtid == 1234'