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- i synthesize instructions events
- b synthesize branches events (branch misses for Arm SPE)
- c synthesize branches events (calls only)
- r synthesize branches events (returns only)
- x synthesize transactions events
- w synthesize ptwrite events
- p synthesize power events (incl. PSB events for Intel PT)
- o synthesize other events recorded due to the use
- of aux-output (refer to perf record)
- I synthesize interrupt or similar (asynchronous) events
- (e.g. Intel PT Event Trace)
- e synthesize error events
- d create a debug log
- f synthesize first level cache events
- m synthesize last level cache events
- M synthesize memory events
- t synthesize TLB events
- a synthesize remote access events
- g synthesize a call chain (use with i or x)
- G synthesize a call chain on existing event records
- l synthesize last branch entries (use with i or x)
- L synthesize last branch entries on existing event records
- s skip initial number of events
- q quicker (less detailed) decoding
- A approximate IPC
- Z prefer to ignore timestamps (so-called "timeless" decoding)
- The default is all events i.e. the same as --itrace=ibxwpe,
- except for perf script where it is --itrace=ce
- In addition, the period (default 100000, except for perf script where it is 1)
- for instructions events can be specified in units of:
- i instructions
- t ticks
- ms milliseconds
- us microseconds
- ns nanoseconds (default)
- Also the call chain size (default 16, max. 1024) for instructions or
- transactions events can be specified.
- Also the number of last branch entries (default 64, max. 1024) for
- instructions or transactions events can be specified.
- Similar to options g and l, size may also be specified for options G and L.
- On x86, note that G and L work poorly when data has been recorded with
- large PEBS. Refer linkperf:perf-intel-pt[1] man page for details.
- It is also possible to skip events generated (instructions, branches, transactions,
- ptwrite, power) at the beginning. This is useful to ignore initialization code.
- --itrace=i0nss1000000
- skips the first million instructions.
- The 'e' option may be followed by flags which affect what errors will or
- will not be reported. Each flag must be preceded by either '+' or '-'.
- The flags are:
- o overflow
- l trace data lost
- If supported, the 'd' option may be followed by flags which affect what
- debug messages will or will not be logged. Each flag must be preceded
- by either '+' or '-'. The flags are:
- a all perf events
- e output only on errors (size configurable - see linkperf:perf-config[1])
- o output to stdout
- If supported, the 'q' option may be repeated to increase the effect.
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