99623c628f
Add compact map display that does not output the whole cpu matrix, only
cpus that got event.
$ perf sched map --compact
*A0 1082427.094098 secs A0 => perf:19404 (CPU 2)
A0 *. 1082427.094127 secs . => swapper:0 (CPU 1)
A0 . *B0 1082427.094174 secs B0 => rcuos/2:25 (CPU 3)
A0 . *. 1082427.094177 secs
*C0 . . 1082427.094187 secs C0 => migration/2:21
C0 *A0 . 1082427.094193 secs
*. A0 . 1082427.094195 secs
*D0 A0 . 1082427.094402 secs D0 => rngd:968
*. A0 . 1082427.094406 secs
. *E0 . 1082427.095221 secs E0 => kworker/1:1:5333
. E0 *F0 1082427.095227 secs F0 => xterm:3342
It helps to display sane output for small thread loads on big cpu
servers.
Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1460467771-26532-4-git-send-email-jolsa@kernel.org
[ Add entry in 'perf sched' man page ]
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
63 lines
1.7 KiB
Plaintext
63 lines
1.7 KiB
Plaintext
perf-sched(1)
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==============
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NAME
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----
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perf-sched - Tool to trace/measure scheduler properties (latencies)
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SYNOPSIS
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--------
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[verse]
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'perf sched' {record|latency|map|replay|script}
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DESCRIPTION
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-----------
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There are five variants of perf sched:
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'perf sched record <command>' to record the scheduling events
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of an arbitrary workload.
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'perf sched latency' to report the per task scheduling latencies
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and other scheduling properties of the workload.
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'perf sched script' to see a detailed trace of the workload that
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was recorded (aliased to 'perf script' for now).
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'perf sched replay' to simulate the workload that was recorded
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via perf sched record. (this is done by starting up mockup threads
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that mimic the workload based on the events in the trace. These
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threads can then replay the timings (CPU runtime and sleep patterns)
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of the workload as it occurred when it was recorded - and can repeat
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it a number of times, measuring its performance.)
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'perf sched map' to print a textual context-switching outline of
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workload captured via perf sched record. Columns stand for
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individual CPUs, and the two-letter shortcuts stand for tasks that
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are running on a CPU. A '*' denotes the CPU that had the event, and
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a dot signals an idle CPU.
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OPTIONS
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-------
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-i::
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--input=<file>::
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Input file name. (default: perf.data unless stdin is a fifo)
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-v::
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--verbose::
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Be more verbose. (show symbol address, etc)
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-D::
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--dump-raw-trace=::
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Display verbose dump of the sched data.
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OPTIONS for 'perf sched map'
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----------------------------
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--compact::
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Show only CPUs with activity. Helps visualizing on high core
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count systems.
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SEE ALSO
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--------
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linkperf:perf-record[1]
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