diff options
Diffstat (limited to 'tools/perf/Documentation/perf-trace-python.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-trace-python.txt | 16 |
1 files changed, 7 insertions, 9 deletions
diff --git a/tools/perf/Documentation/perf-trace-python.txt b/tools/perf/Documentation/perf-trace-python.txt index a241aca7718..693be804dd3 100644 --- a/tools/perf/Documentation/perf-trace-python.txt +++ b/tools/perf/Documentation/perf-trace-python.txt @@ -1,5 +1,5 @@ perf-trace-python(1) -================== +==================== NAME ---- @@ -93,7 +93,7 @@ don't care how it exited, so we'll use 'perf record' to record only the sys_enter events: ---- -# perf record -c 1 -f -a -M -R -e raw_syscalls:sys_enter +# perf record -a -e raw_syscalls:sys_enter ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 56.545 MB perf.data (~2470503 samples) ] @@ -182,7 +182,7 @@ mean either that the record step recorded event types that it wasn't really interested in, or the script was run against a trace file that doesn't correspond to the script. -The script generated by -g option option simply prints a line for each +The script generated by -g option simply prints a line for each event found in the trace stream i.e. it basically just dumps the event and its parameter values to stdout. The print_header() function is simply a utility function used for that purpose. Let's rename the @@ -359,7 +359,7 @@ your script: # cat kernel-source/tools/perf/scripts/python/bin/syscall-counts-record #!/bin/bash -perf record -c 1 -f -a -M -R -e raw_syscalls:sys_enter +perf record -a -e raw_syscalls:sys_enter ---- The 'report' script is also a shell script with the same base name as @@ -449,12 +449,10 @@ available as calls back into the perf executable (see below). As an example, the following perf record command can be used to record all sched_wakeup events in the system: - # perf record -c 1 -f -a -M -R -e sched:sched_wakeup + # perf record -a -e sched:sched_wakeup Traces meant to be processed using a script should be recorded with -the above options: -c 1 says to sample every event, -a to enable -system-wide collection, -M to multiplex the output, and -R to collect -raw samples. +the above option: -a to enable system-wide collection. The format file for the sched_wakep event defines the following fields (see /sys/kernel/debug/tracing/events/sched/sched_wakeup/format): @@ -584,7 +582,7 @@ files: flag_str(event_name, field_name, field_value) - returns the string represention corresponding to field_value for the flag field field_name of event event_name symbol_str(event_name, field_name, field_value) - returns the string represention corresponding to field_value for the symbolic field field_name of event event_name -The *autodict* function returns a special special kind of Python +The *autodict* function returns a special kind of Python dictionary that implements Perl's 'autovivifying' hashes in Python i.e. with autovivifying hashes, you can assign nested hash values without having to go to the trouble of creating intermediate levels if |