table of contents
other versions
- wheezy-backports 3.16.7-ckt20-1~bpo70+2
- jessie 3.16.7-ckt20-1
PERF_3.16-REPORT(1) | perf Manual | PERF_3.16-REPORT(1) |
NAME¶
perf-report - Read perf.data (created by perf record) and display the profileSYNOPSIS¶
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)
-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. This option will affect the
percentage of the overhead column. See --percentage for more info.
-d, --dsos=
Only consider symbols in these dsos. CSV that
understands file://filename entries. This option will affect the
percentage of the overhead column. See --percentage for more info.
-S, --symbols=
Only consider these symbols. CSV that
understands file://filename entries. This option will affect the
percentage of the overhead column. See --percentage for more info.
--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.
-F, --fields=
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.
•overhead: Overhead percentage of
sample
•overhead_sys: Overhead percentage of
sample running in system mode
•overhead_us: Overhead percentage of
sample running in user mode
•overhead_guest_sys: Overhead percentage
of sample running in system mode on guest machine
•overhead_guest_us: Overhead percentage
of sample running in user mode on guest machine
•sample: Number of sample
•period: Raw number of event count of
sample
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'.
Specify output field - multiple keys can be
specified in CSV format. Following fields are available: overhead,
overhead_sys, overhead_us, overhead_children, sample and period. Also it can
contain any sort key(s).
-p, --parent=<regex>
By default, every sort keys not specified in -F will be appended automatically.
If --mem-mode option is used, following sort keys are also available (incompatible with --branch-stack): symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline.
•symbol_daddr: name of data symbol being
executed on at the time of sample
•dso_daddr: name of library or module
containing the data being executed on at the time of sample
•locked: whether the bus was locked at
the time of sample
•tlb: type of tlb access for the data at
the time of sample
•mem: type of memory access for the data
at the time of sample
•snoop: type of snoop (if any) for the
data at the time of sample
•dcacheline: the cacheline the data
address is on at the time of sample
And default sort keys are changed to local_weight, mem, sym, dso, symbol_daddr, dso_daddr, snoop, tlb, locked, see '--mem-mode'.
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:
--children
•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.
Accumulate callchain of children to parent
entry so that then can show up in the output. The output will have a new
"Children" column and will be sorted on the data. It requires
callchains are recorded.
--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.
-G, --inverted
Default: 127
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.
--mem-mode
Use the data addresses of samples in addition
to instruction addresses to build the histograms. To generate meaningful
output, the perf.data file must have been obtained using perf record -d -W and
using a special event -e cpu/mem-loads/ or -e cpu/mem-stores/. See perf
mem for simpler access.
--percent-limit
Do not show entries which have an overhead
under that percent. (Default: 0).
--percentage
Determine how to display the overhead
percentage of filtered entries. Filters can be applied by --comms, --dsos
and/or --symbols options and Zoom operations on the TUI (thread, dso, etc).
--header
"relative" means it's relative to filtered entries only so that the sum of shown entries will be always 100%. "absolute" means it retains the original value before and after the filter is applied.
Show header information in the perf.data file.
This includes various information like hostname, OS and perf version, cpu/mem
info, perf command line, event list and so on. Currently only --stdio output
supports this feature.
--header-only
Show only perf.data header (forces
--stdio).
SEE ALSO¶
perf_3.16-stat(1), perf_3.16-annotate(1)02/24/2016 | perf |