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diff --git a/kernel/tools/perf/Documentation/perf-script.txt b/kernel/tools/perf/Documentation/perf-script.txt new file mode 100644 index 000000000..79445750f --- /dev/null +++ b/kernel/tools/perf/Documentation/perf-script.txt @@ -0,0 +1,227 @@ +perf-script(1) +============= + +NAME +---- +perf-script - Read perf.data (created by perf record) and display trace output + +SYNOPSIS +-------- +[verse] +'perf script' [<options>] +'perf script' [<options>] record <script> [<record-options>] <command> +'perf script' [<options>] report <script> [script-args] +'perf script' [<options>] <script> <required-script-args> [<record-options>] <command> +'perf script' [<options>] <top-script> [script-args] + +DESCRIPTION +----------- +This command reads the input file and displays the trace recorded. + +There are several variants of perf script: + + 'perf script' to see a detailed trace of the workload that was + recorded. + + You can also run a set of pre-canned scripts that aggregate and + summarize the raw trace data in various ways (the list of scripts is + available via 'perf script -l'). The following variants allow you to + record and run those scripts: + + 'perf script record <script> <command>' to record the events required + for 'perf script report'. <script> is the name displayed in the + output of 'perf script --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 script 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 script + record <script>' is used and should be present for this command to + succeed. [args] refers to the (mainly optional) args expected by + the script. + + 'perf script <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 script --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 script record' + and 'perf script 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 script <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 script --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 script + record' and 'live-mode' variants; this isn't possible however for + <top-script> 'live-mode' or 'perf script 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-script=:: + Display verbose dump of the trace data. + +-L:: +--Latency=:: + Show latency attributes (irqs/preemption disabled, etc). + +-l:: +--list=:: + Display a list of available trace scripts. + +-s ['lang']:: +--script=:: + Process trace data with the given script ([lang]:script[.ext]). + If the string 'lang' is specified in place of a script name, a + list of supported languages will be displayed instead. + +-g:: +--gen-script=:: + Generate perf-script.[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. + +-i:: +--input=:: + Input file name. (default: perf.data unless stdin is a fifo) + +-d:: +--debug-mode:: + Do various checks like samples ordering and lost events. + +-f:: +--fields:: + Comma separated list of fields to print. Options are: + comm, tid, pid, time, cpu, event, trace, ip, sym, dso, addr, symoff, srcline, period. + Field list can be prepended with the type, trace, sw or hw, + to indicate to which event type the field list applies. + e.g., -f sw:comm,tid,time,ip,sym and -f trace:time,cpu,trace + + perf script -f <fields> + + is equivalent to: + + perf script -f trace:<fields> -f sw:<fields> -f hw:<fields> + + i.e., the specified fields apply to all event types if the type string + is not given. + + The arguments are processed in the order received. A later usage can + reset a prior request. e.g.: + + -f trace: -f comm,tid,time,ip,sym + + The first -f suppresses trace events (field list is ""), but then the + second invocation sets the fields to comm,tid,time,ip,sym. In this case a + warning is given to the user: + + "Overriding previous field request for all events." + + Alternatively, consider the order: + + -f comm,tid,time,ip,sym -f trace: + + The first -f sets the fields for all events and the second -f + suppresses trace events. The user is given a warning message about + the override, and the result of the above is that only S/W and H/W + events are displayed with the given fields. + + For the 'wildcard' option if a user selected field is invalid for an + event type, a message is displayed to the user that the option is + ignored for that type. For example: + + $ perf script -f comm,tid,trace + 'trace' not valid for hardware events. Ignoring. + 'trace' not valid for software events. Ignoring. + + Alternatively, if the type is given an invalid field is specified it + is an error. For example: + + perf script -v -f sw:comm,tid,trace + 'trace' not valid for software events. + + At this point usage is displayed, and perf-script exits. + + Finally, a user may not set fields to none for all event types. + i.e., -f "" is not allowed. + +-k:: +--vmlinux=<file>:: + vmlinux pathname + +--kallsyms=<file>:: + kallsyms pathname + +--symfs=<directory>:: + Look for files with symbols relative to this directory. + +-G:: +--hide-call-graph:: + When printing symbols do not display call chain. + +-C:: +--cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can + be provided as a comma-separated list with no space: 0,1. Ranges of + CPUs are specified with -: 0-2. Default is to report samples on all + CPUs. + +-c:: +--comms=:: + Only display events for these comms. CSV that understands + file://filename entries. + +--pid=:: + Only show events for given process ID (comma separated list). + +--tid=:: + Only show events for given thread ID (comma separated list). + +-I:: +--show-info:: + Display extended information about the perf.data file. This adds + information which may be very large and thus may clutter the display. + It currently includes: cpu and numa topology of the host system. + It can only be used with the perf script report mode. + +--show-kernel-path:: + Try to resolve the path of [kernel.kallsyms] + +--show-task-events + Display task related events (e.g. FORK, COMM, EXIT). + +--show-mmap-events + Display mmap related events (e.g. MMAP, MMAP2). + +--header + Show perf.data header. + +--header-only + Show only perf.data header. + +SEE ALSO +-------- +linkperf:perf-record[1], linkperf:perf-script-perl[1], +linkperf:perf-script-python[1] |