PERF-REPORT(1) perf Manual PERF-REPORT(1)NAMEperf-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
file://filename 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
file://filename entries.
-S, --symbols=
Only consider these symbols. CSV that understands file://filename
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 debuggin info must be provided.
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
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], --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.
Default: fractal,0.5,callee.
-G, --inverted
alias for inverted caller based call graph.
--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 ALSOperf-stat(1), perf-annotate(1)perf 11/26/2013 PERF-REPORT(1)
