diff options
Diffstat (limited to 'tools/perf/Documentation/perf-record.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 15e0fa87241b..c6f9f31b6039 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -60,6 +60,8 @@ OPTIONS - 'name' : User defined event name. Single quotes (') may be used to escape symbols in the name from parsing by shell and tool like this: name=\'CPU_CLK_UNHALTED.THREAD:cmask=0x1\'. + - 'aux-output': Generate AUX records instead of events. This requires + that an AUX area event is also provided. See the linkperf:perf-list[1] man page for more parameters. @@ -422,9 +424,14 @@ CLOCK_BOOTTIME, CLOCK_REALTIME and CLOCK_TAI. -S:: --snapshot:: Select AUX area tracing Snapshot Mode. This option is valid only with an -AUX area tracing event. Optionally the number of bytes to capture per -snapshot can be specified. In Snapshot Mode, trace data is captured only when -signal SIGUSR2 is received. +AUX area tracing event. Optionally, certain snapshot capturing parameters +can be specified in a string that follows this option: + 'e': take one last snapshot on exit; guarantees that there is at least one + snapshot in the output file; + <size>: if the PMU supports this, specify the desired snapshot size. + +In Snapshot Mode trace data is captured only when signal SIGUSR2 is received +and on exit if the above 'e' option is given. --proc-map-timeout:: When processing pre-existing threads /proc/XXX/mmap, it may take a long time, |