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Diffstat (limited to 'tools/perf/Documentation/perf-sched.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-sched.txt | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 5fbe42bd59..a216d2991b 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -20,6 +20,26 @@ There are several variants of 'perf sched': 'perf sched latency' to report the per task scheduling latencies and other scheduling properties of the workload. + Example usage: + perf sched record -- sleep 1 + perf sched latency + + ------------------------------------------------------------------------------------------------------------------------------------------- + Task | Runtime ms | Count | Avg delay ms | Max delay ms | Max delay start | Max delay end | + ------------------------------------------------------------------------------------------------------------------------------------------- + perf:(2) | 2.804 ms | 66 | avg: 0.524 ms | max: 1.069 ms | max start: 254752.314960 s | max end: 254752.316029 s + NetworkManager:1343 | 0.372 ms | 13 | avg: 0.008 ms | max: 0.013 ms | max start: 254751.551153 s | max end: 254751.551166 s + kworker/1:2-xfs:4649 | 0.012 ms | 1 | avg: 0.008 ms | max: 0.008 ms | max start: 254751.519807 s | max end: 254751.519815 s + kworker/3:1-xfs:388 | 0.011 ms | 1 | avg: 0.006 ms | max: 0.006 ms | max start: 254751.519809 s | max end: 254751.519815 s + sleep:147736 | 0.938 ms | 3 | avg: 0.006 ms | max: 0.007 ms | max start: 254751.313817 s | max end: 254751.313824 s + + It shows Runtime(time that a task spent actually running on the CPU), + Count(number of times a delay was calculated) and delay(time that a + task was ready to run but was kept waiting). + + Tasks with the same command name are merged and the merge count is + given within (), However if -p option is used, pid is mentioned. + 'perf sched script' to see a detailed trace of the workload that was recorded (aliased to 'perf script' for now). @@ -78,6 +98,22 @@ OPTIONS --force:: Don't complain, do it. +OPTIONS for 'perf sched latency' +------------------------------- + +-C:: +--CPU <n>:: + CPU to profile on. + +-p:: +--pids:: + latency stats per pid instead of per command name. + +-s:: +--sort <key[,key2...]>:: + sort by key(s): runtime, switch, avg, max + by default it's sorted by "avg ,max ,switch ,runtime". + OPTIONS for 'perf sched map' ---------------------------- |