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
-------
}
static const char * const sched_usage[] = {
- "perf sched [<options>] {record|latency|replay}",
+ "perf sched [<options>] {record|latency|replay|trace}",
NULL
};
usage_with_options(replay_usage, replay_options);
}
__cmd_replay();
+ } else if (!strcmp(argv[0], "trace")) {
+ /*
+ * Aliased to 'perf trace' for now:
+ */
+ return cmd_trace(argc, argv, prefix);
} else {
usage_with_options(sched_usage, sched_options);
}