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Diffstat (limited to 'tools/perf/Documentation/itrace.txt')
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diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt new file mode 100644 index 000000000..0916bbfe6 --- /dev/null +++ b/tools/perf/Documentation/itrace.txt @@ -0,0 +1,70 @@ + 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. |