perf-inject — Filter to augment the events stream with additional information


perf inject <options>


perf-inject reads a perf-record event stream and repipes it to stdout. At any point the processing code can inject other events into the event stream - in this case build-ids (-b option) are read and injected as needed into the event stream.

Build-ids are just the first user of perf-inject - potentially anything that needs userspace processing to augment the events stream with additional information could make use of this facility.


-b, --build-ids=

Inject build-ids into the output stream

-v, --verbose

Be more verbose.

-i, --input=

Input file name. (default: stdin)

-o, --output=

Output file name. (default: stdout)

-s, --sched-stat

Merge sched_stat and sched_switch for getting events where and how long tasks slept. sched_switch contains a callchain where a task slept and sched_stat contains a timeslice how long a task slept.


kallsyms pathname


Decode Instruction Tracing data, replacing it with synthesized events. Options are:

i       synthesize instructions events
b       synthesize branches events
c       synthesize branches events (calls only)
r       synthesize branches events (returns only)
x       synthesize transactions events
w       synthesize ptwrite events
p       synthesize power events
o       synthesize other events recorded due to the use
        of aux-output (refer to perf record)
e       synthesize error events
d       create a debug log
g       synthesize a call chain (use with i or x)
l       synthesize last branch entries (use with i or x)
s       skip initial number of events
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.
It is also possible to skip events generated (instructions, branches, transactions,
ptwrite, power) at the beginning. This is useful to ignore initialization code.
skips the first million instructions.

Use with --itrace to strip out non-synthesized events.

-j, --jit

Process jitdump files by injecting the mmap records corresponding to jitted functions. This option also generates the ELF images for each jitted function found in the jitdumps files captured in the input file. Use this option if you are monitoring environment using JIT runtimes, such as Java, DART or V8.

-f, --force

Don’t complain, do it.

See Also

perf-record(1), perf-report(1), perf-archive(1)


10/28/2019 perf Manual