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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /tools/perf/Documentation/itrace.txt
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
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Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+ i synthesize instructions events
+ y synthesize cycles 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=iybxwpe,
+ 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.