Add entry to perf-sched documentation for timehist command and its options.
v2: Addressed comments by Namhyung Signed-off-by: David Ahern <dsah...@gmail.com> Cc: Ingo Molnar <mi...@kernel.org> Cc: Frederic Weisbecker <fweis...@gmail.com> Cc: Peter Zijlstra <a.p.zijls...@chello.nl> Cc: Mike Galbraith <efa...@gmx.de> Cc: Jiri Olsa <jo...@redhat.com> Cc: Namhyung Kim <namhy...@kernel.org> Cc: Stephane Eranian <eran...@google.com> Cc: Pekka Enberg <penb...@kernel.org> --- tools/perf/Documentation/perf-sched.txt | 61 ++++++++++++++++++++++++++++++++- 1 file changed, 60 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 8ff4df956951..e7bb19fcdbff 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -8,7 +8,7 @@ perf-sched - Tool to trace/measure scheduler properties (latencies) SYNOPSIS -------- [verse] -'perf sched' {record|latency|map|replay|script} +'perf sched' {record|latency|map|replay|script|timehist} DESCRIPTION ----------- @@ -36,6 +36,11 @@ There are five variants of perf sched: are running on a CPU. A '*' denotes the CPU that had the event, and a dot signals an idle CPU. + 'perf sched timehist' to show context-switching analysis with times + between schedule-in, schedule delay, and run time. If callchains are + present stack trace is dumped at the end of the line. A summary of + run times can be shown as well. + OPTIONS ------- -i:: @@ -50,6 +55,60 @@ OPTIONS --dump-raw-trace=:: Display verbose dump of the sched data. +TIMEHIST OPTIONS +---------------- +-k:: +--vmlinux=<file>:: + vmlinux pathname + +--kallsyms=<file>:: + kallsyms pathname + +-s:: +--summary:: + Show only a summary of scheduling by thread with min, max, and average + run times (in sec) and relative stddev. + +-S:: +--with-summary:: + Show all scheduling events followed by a summary by thread with min, + max, and average run times (in sec) and relative stddev. + +-w:: +--wakeups:: + Show wakeup events. + +-c:: +--comms=:: + Only show events for given comms (comma separated list) + +-p:: +--pid=:: + Only show events for given process ID (comma separated list). + +-t:: +--tid=:: + Only show events for given thread ID (comma separated list). + +--call-graph:: + Display call chains. Default is on. Use --no-call-graph to suppress + +--max-stack:: + Set the stack depth limit when showing the callchains. Default: 127 + +-x:: +--exclude-sym:: + Symbols to skip in backtrace. Useful to compact repetitive or + uninteresting frames to pull more useful frames into view. + +--symfs=<directory>:: + Look for files with symbols relative to this directory. + +-V:: +--cpu-visual:: + Add a visual that better emphasizes activity by cpu. Idle times + are denoted with 'i'; schedule events with an 's'. + SEE ALSO -------- linkperf:perf-record[1] -- 1.8.3.4 (Apple Git-47) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/