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| author | Ingo Molnar <mingo@elte.hu> | 2009-09-13 18:51:04 +0400 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-13 19:55:23 +0400 |
| commit | c13f0d3c8165e9592102687fa999da0a0d9c3724 (patch) | |
| tree | 5f679c0b390a7b7f3b0e116c75ecc0f1784c56a2 /tools/perf/Documentation | |
| parent | 459ec28ab404d7afcd512ce9b855959ad301605a (diff) | |
| download | linux-c13f0d3c8165e9592102687fa999da0a0d9c3724.tar.xz | |
perf sched: Add 'perf sched trace', improve documentation
Alias 'perf sched trace' to 'perf trace', for workflow completeness.
Add a bit of documentation for perf sched.
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-sched.txt | 22 |
1 files changed, 19 insertions, 3 deletions
diff --git a/tools/perf/Documentation/perf-sched.txt b/tools/perf/Documentation/perf-sched.txt index 056320eecb3a..1ce79198997b 100644 --- a/tools/perf/Documentation/perf-sched.txt +++ b/tools/perf/Documentation/perf-sched.txt @@ -3,16 +3,32 @@ perf-sched(1) NAME ---- -perf-sched - Read perf.data (created by perf record) and display sched output +perf-sched - Tool to trace/measure scheduler properties (latencies) SYNOPSIS -------- [verse] -'perf sched' [-i <file> | --input=file] symbol_name +'perf sched' {record|latency|replay|trace} DESCRIPTION ----------- -This command reads the input file and displays the latencies recorded. +There's four variants of perf sched: + + 'perf sched record <command>' to record the scheduling events + of an arbitrary workload. + + 'perf sched latency' to report the per task scheduling latencies + and other scheduling properties of the workload. + + 'perf sched trace' to see a detailed trace of the workload that + was recorded. + + 'perf sched replay' to simulate the workload that was recorded + via perf sched record. (this is done by starting up mockup threads + that mimic the workload based on the events in the trace. These + threads can then replay the timings (CPU runtime and sleep patterns) + of the workload as it occured when it was recorded - and can repeat + it a number of times, measuring its performance.) OPTIONS ------- |