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perf trace: update Documentation with new perf trace variants

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Add documentation describing new 'perf trace' command changes
e.g. <command> handling and live-mode/top variants.

Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Acked-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
This commit is contained in:
Tom Zanussi 2010-11-10 08:19:35 -06:00
parent b5b8731219
commit d3c4f798ac
1 changed files with 49 additions and 8 deletions
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57
tools/perf/Documentation/perf-trace.txt
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@ -8,7 +8,11 @@ perf-trace - Read perf.data (created by perf record) and display trace output
SYNOPSIS
--------
[verse]
'perf trace' {record <script> | report <script> [args] }
'perf trace' [<options>]
'perf trace' [<options>] record <script> [<record-options>] <command>
'perf trace' [<options>] report <script> [script-args]
'perf trace' [<options>] <script> <required-script-args> [<record-options>] <command>
'perf trace' [<options>] <top-script> [script-args]
DESCRIPTION
-----------
@ -24,23 +28,53 @@ There are several variants of perf trace:
available via 'perf trace -l'). The following variants allow you to
record and run those scripts:
'perf trace record <script>' to record the events required for 'perf
trace report'. <script> is the name displayed in the output of
'perf trace --list' i.e. the actual script name minus any language
extension.
'perf trace record <script> <command>' to record the events required
for 'perf trace report'. <script> is the name displayed in the
output of 'perf trace --list' i.e. the actual script name minus any
language extension. If <command> is not specified, the events are
recorded using the -a (system-wide) 'perf record' option.
'perf trace report <script>' to run and display the results of
<script>. <script> is the name displayed in the output of 'perf
'perf trace report <script> [args]' to run and display the results
of <script>. <script> is the name displayed in the output of 'perf
trace --list' i.e. the actual script name minus any language
extension. The perf.data output from a previous run of 'perf trace
record <script>' is used and should be present for this command to
succeed.
succeed. [args] refers to the (mainly optional) args expected by
the script.
'perf trace <script> <required-script-args> <command>' to both
record the events required for <script> and to run the <script>
using 'live-mode' i.e. without writing anything to disk. <script>
is the name displayed in the output of 'perf trace --list' i.e. the
actual script name minus any language extension. If <command> is
not specified, the events are recorded using the -a (system-wide)
'perf record' option. If <script> has any required args, they
should be specified before <command>. This mode doesn't allow for
optional script args to be specified; if optional script args are
desired, they can be specified using separate 'perf trace record'
and 'perf trace report' commands, with the stdout of the record step
piped to the stdin of the report script, using the '-o -' and '-i -'
options of the corresponding commands.
'perf trace <top-script>' to both record the events required for
<top-script> and to run the <top-script> using 'live-mode'
i.e. without writing anything to disk. <top-script> is the name
displayed in the output of 'perf trace --list' i.e. the actual
script name minus any language extension; a <top-script> is defined
as any script name ending with the string 'top'.
[<record-options>] can be passed to the record steps of 'perf trace
record' and 'live-mode' variants; this isn't possible however for
<top-script> 'live-mode' or 'perf trace report' variants.
See the 'SEE ALSO' section for links to language-specific
information on how to write and run your own trace scripts.
OPTIONS
-------
<command>...::
Any command you can specify in a shell.
-D::
--dump-raw-trace=::
Display verbose dump of the trace data.
@ -64,6 +98,13 @@ OPTIONS
Generate perf-trace.[ext] starter script for given language,
using current perf.data.
-a::
Force system-wide collection. Scripts run without a <command>
normally use -a by default, while scripts run with a <command>
normally don't - this option allows the latter to be run in
system-wide mode.
SEE ALSO
--------
linkperf:perf-record[1], linkperf:perf-trace-perl[1],