perf-report (1)

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NAME

perf-report - Read perf.data (created by perf record) and display the profile

SYNOPSIS

perf report [-i <file> | --input=file]

DESCRIPTION

This command displays the performance counter profile information recorded via perf record.

OPTIONS

-i, --input=

Input file name. (default: perf.data unless stdin is a fifo)

-v, --verbose

Be more verbose. (show symbol address, etc)

-d, --dsos=

Only consider symbols in these dsos. CSV that understands m[blue]file://filenamem[] entries.

-n, --show-nr-samples

Show the number of samples for each symbol

--showcpuutilization

Show sample percentage for different cpu modes.

-T, --threads

Show per-thread event counters

-c, --comms=

Only consider symbols in these comms. CSV that understands m[blue]file://filenamem[] entries.

-S, --symbols=

Only consider these symbols. CSV that understands m[blue]file://filenamem[] entries.

--symbol-filter=

Only show symbols that match (partially) with this filter.

-U, --hide-unresolved

Only display entries resolved to a symbol.

-s, --sort=

Sort histogram entries by given key(s) - multiple keys can be specified in CSV format. Following sort keys are available: pid, comm, dso, symbol, parent, cpu, srcline, weight, local_weight.

Each key has following meaning:

• comm: command (name) of the task which can be read via /proc/<pid>/comm

• pid: command and tid of the task

• dso: name of library or module executed at the time of sample

• symbol: name of function executed at the time of sample

• parent: name of function matched to the parent regex filter. Unmatched entries are displayed as "[other]".

• cpu: cpu number the task ran at the time of sample

• srcline: filename and line number executed at the time of sample. The DWARF debugging info must be provided.

• weight: Event specific weight, e.g. memory latency or transaction abort cost. This is the global weight.

• local_weight: Local weight version of the weight above.

• transaction: Transaction abort flags.

By default, comm, dso and symbol keys are used.
(i.e. --sort comm,dso,symbol)

If --branch-stack option is used, following sort keys are also
available:
dso_from, dso_to, symbol_from, symbol_to, mispredict.

• dso_from: name of library or module branched from

• dso_to: name of library or module branched to

• symbol_from: name of function branched from

• symbol_to: name of function branched to

• mispredict: "N" for predicted branch, "Y" for mispredicted branch

• in_tx: branch in TSX transaction

• abort: TSX transaction abort.

And default sort keys are changed to comm, dso_from, symbol_from, dso_to
and symbol_to, see '--branch-stack'.

-p, --parent=<regex>

A regex filter to identify parent. The parent is a caller of this function and searched through the callchain, thus it requires callchain information recorded. The pattern is in the exteneded regex format and defaults to "^sys_|^do_page_fault", see --sort parent.

-x, --exclude-other

Only display entries with parent-match.

-w, --column-widths=<width[,width...]>

Force each column width to the provided list, for large terminal readability.

-t, --field-separator=

Use a special separator character and don't pad with spaces, replacing all occurrences of this separator in symbol names (and other output) with a . character, that thus it's the only non valid separator.

-D, --dump-raw-trace

Dump raw trace in ASCII.

-g [type,min[,limit],order[,key]], --call-graph

Display call chains using type, min percent threshold, optional print limit and order. type can be either:

• flat: single column, linear exposure of call chains.

• graph: use a graph tree, displaying absolute overhead rates.

• fractal: like graph, but displays relative rates. Each branch of the tree is considered as a new profiled object.

order can be either:
- callee: callee based call graph.
- caller: inverted caller based call graph.

key can be:
- function: compare on functions
- address: compare on individual code addresses

Default: fractal,0.5,callee,function.

--max-stack

Set the stack depth limit when parsing the callchain, anything beyond the specified depth will be ignored. This is a trade-off between information loss and faster processing especially for workloads that can have a very long callchain stack.

Default: 127

-G, --inverted

alias for inverted caller based call graph.

--ignore-callees=<regex>

Ignore callees of the function(s) matching the given regex. This has the effect of collecting the callers of each such function into one place in the call-graph tree.

--pretty=<key>

Pretty printing style. key: normal, raw

--stdio

Use the stdio interface.

--tui

Use the TUI interface, that is integrated with annotate and allows zooming into DSOs or threads, among other features. Use of --tui requires a tty, if one is not present, as when piping to other commands, the stdio interface is used.

--gtk

Use the GTK2 interface.

-k, --vmlinux=<file>

vmlinux pathname

--kallsyms=<file>

kallsyms pathname

-m, --modules

Load module symbols. WARNING: This should only be used with -k and a LIVE kernel.

-f, --force

Don't complain, do it.

--symfs=<directory>

Look for files with symbols relative to this directory.

-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.

-M, --disassembler-style=

Set disassembler style for objdump.

--source

Interleave source code with assembly code. Enabled by default, disable with --no-source.

--asm-raw

Show raw instruction encoding of assembly instructions.

--show-total-period

Show a column with the sum of periods.

-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.

-b, --branch-stack

Use the addresses of sampled taken branches instead of the instruction address to build the histograms. To generate meaningful output, the perf.data file must have been obtained using perf record -b or perf record --branch-filter xxx where xxx is a branch filter option. perf report is able to auto-detect whether a perf.data file contains branch stacks and it will automatically switch to the branch view mode, unless --no-branch-stack is used.

--objdump=<path>

Path to objdump binary.

--group

Show event group information together.

--demangle

Demangle symbol names to human readable form. It's enabled by default, disable with --no-demangle.

--percent-limit

Do not show entries which have an overhead under that percent. (Default: 0).

SEE ALSO

perf-stat(1), perf-annotate(1)

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