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Diffstat (limited to 'tools/perf/Documentation/perf-kwork.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-kwork.txt | 38 |
1 files changed, 36 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-kwork.txt b/tools/perf/Documentation/perf-kwork.txt index 482d6c52e2..109ace1d5e 100644 --- a/tools/perf/Documentation/perf-kwork.txt +++ b/tools/perf/Documentation/perf-kwork.txt @@ -8,7 +8,7 @@ perf-kwork - Tool to trace/measure kernel work properties (latencies) SYNOPSIS -------- [verse] -'perf kwork' {record|report|latency|timehist} +'perf kwork' {record|report|latency|timehist|top} DESCRIPTION ----------- @@ -23,6 +23,8 @@ There are several variants of 'perf kwork': 'perf kwork timehist' provides an analysis of kernel work events. + 'perf kwork top' to report the task cpu usage. + Example usage: perf kwork record -- sleep 1 perf kwork report @@ -30,6 +32,8 @@ There are several variants of 'perf kwork': perf kwork latency perf kwork latency -b perf kwork timehist + perf kwork top + perf kwork top -b By default it shows the individual work events such as irq, workqeueu, including the run time and delay (time between raise and actually entry): @@ -66,7 +70,7 @@ OPTIONS -k:: --kwork:: - List of kwork to profile (irq, softirq, workqueue, etc) + List of kwork to profile (irq, softirq, workqueue, sched, etc) -v:: --verbose:: @@ -175,6 +179,36 @@ OPTIONS for 'perf kwork timehist' stop time is not given (i.e, time string is 'x.y,') then analysis goes to end of file. +OPTIONS for 'perf kwork top' +--------------------------------- + +-b:: +--use-bpf:: + Use BPF to measure task cpu usage. + +-C:: +--cpu:: + Only show events for the given CPU(s) (comma separated list). + +-i:: +--input:: + Input file name. (default: perf.data unless stdin is a fifo) + +-n:: +--name:: + Only show events for the given name. + +-s:: +--sort:: + Sort by key(s): rate, runtime, tid + +--time:: + Only analyze samples within given time window: <start>,<stop>. Times + have the format seconds.microseconds. If start is not given (i.e., time + string is ',x.y') then analysis starts at the beginning of the file. If + stop time is not given (i.e, time string is 'x.y,') then analysis goes + to end of file. + SEE ALSO -------- linkperf:perf-record[1] |