![Jiri Olsa](/assets/img/avatar_default.png)
Currently the perf.data header is always displayed for stdio output, which is no always useful. Disabling header information by default and adding following options to control header output: --header - display header information (old default) --header-only - display header information only w/o further processing, forces stdio output Signed-off-by: Jiri Olsa <jolsa@redhat.com> Acked-by: David Ahern <dsahern@gmail.com> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1386583370-1699-2-git-send-email-jolsa@redhat.com [ Added single line explaining talking about the new --header* options, to address David Ahern comment; better man page entry for the new options, from Namhyung Kim ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
252 lines
7.2 KiB
Plaintext
252 lines
7.2 KiB
Plaintext
perf-report(1)
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==============
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NAME
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----
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perf-report - Read perf.data (created by perf record) and display the profile
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SYNOPSIS
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--------
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[verse]
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'perf report' [-i <file> | --input=file]
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DESCRIPTION
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-----------
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This command displays the performance counter profile information recorded
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via perf record.
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OPTIONS
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-------
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-i::
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--input=::
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Input file name. (default: perf.data unless stdin is a fifo)
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-v::
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--verbose::
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Be more verbose. (show symbol address, etc)
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-d::
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--dsos=::
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Only consider symbols in these dsos. CSV that understands
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file://filename entries.
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-n::
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--show-nr-samples::
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Show the number of samples for each symbol
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--showcpuutilization::
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Show sample percentage for different cpu modes.
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-T::
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--threads::
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Show per-thread event counters
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-c::
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--comms=::
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Only consider symbols in these comms. CSV that understands
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file://filename entries.
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-S::
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--symbols=::
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Only consider these symbols. CSV that understands
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file://filename entries.
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--symbol-filter=::
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Only show symbols that match (partially) with this filter.
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-U::
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--hide-unresolved::
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Only display entries resolved to a symbol.
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-s::
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--sort=::
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Sort histogram entries by given key(s) - multiple keys can be specified
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in CSV format. Following sort keys are available:
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pid, comm, dso, symbol, parent, cpu, srcline, weight, local_weight.
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Each key has following meaning:
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- comm: command (name) of the task which can be read via /proc/<pid>/comm
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- pid: command and tid of the task
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- dso: name of library or module executed at the time of sample
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- symbol: name of function executed at the time of sample
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- parent: name of function matched to the parent regex filter. Unmatched
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entries are displayed as "[other]".
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- cpu: cpu number the task ran at the time of sample
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- srcline: filename and line number executed at the time of sample. The
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DWARF debugging info must be provided.
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- weight: Event specific weight, e.g. memory latency or transaction
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abort cost. This is the global weight.
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- local_weight: Local weight version of the weight above.
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- transaction: Transaction abort flags.
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By default, comm, dso and symbol keys are used.
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(i.e. --sort comm,dso,symbol)
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If --branch-stack option is used, following sort keys are also
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available:
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dso_from, dso_to, symbol_from, symbol_to, mispredict.
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- dso_from: name of library or module branched from
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- dso_to: name of library or module branched to
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- symbol_from: name of function branched from
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- symbol_to: name of function branched to
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- mispredict: "N" for predicted branch, "Y" for mispredicted branch
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- in_tx: branch in TSX transaction
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- abort: TSX transaction abort.
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And default sort keys are changed to comm, dso_from, symbol_from, dso_to
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and symbol_to, see '--branch-stack'.
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-p::
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--parent=<regex>::
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A regex filter to identify parent. The parent is a caller of this
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function and searched through the callchain, thus it requires callchain
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information recorded. The pattern is in the exteneded regex format and
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defaults to "\^sys_|^do_page_fault", see '--sort parent'.
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-x::
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--exclude-other::
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Only display entries with parent-match.
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-w::
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--column-widths=<width[,width...]>::
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Force each column width to the provided list, for large terminal
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readability.
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-t::
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--field-separator=::
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Use a special separator character and don't pad with spaces, replacing
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all occurrences of this separator in symbol names (and other output)
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with a '.' character, that thus it's the only non valid separator.
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-D::
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--dump-raw-trace::
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Dump raw trace in ASCII.
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-g [type,min[,limit],order[,key]]::
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--call-graph::
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Display call chains using type, min percent threshold, optional print
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limit and order.
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type can be either:
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- flat: single column, linear exposure of call chains.
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- graph: use a graph tree, displaying absolute overhead rates.
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- fractal: like graph, but displays relative rates. Each branch of
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the tree is considered as a new profiled object. +
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order can be either:
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- callee: callee based call graph.
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- caller: inverted caller based call graph.
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key can be:
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- function: compare on functions
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- address: compare on individual code addresses
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Default: fractal,0.5,callee,function.
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--max-stack::
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Set the stack depth limit when parsing the callchain, anything
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beyond the specified depth will be ignored. This is a trade-off
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between information loss and faster processing especially for
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workloads that can have a very long callchain stack.
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Default: 127
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-G::
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--inverted::
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alias for inverted caller based call graph.
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--ignore-callees=<regex>::
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Ignore callees of the function(s) matching the given regex.
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This has the effect of collecting the callers of each such
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function into one place in the call-graph tree.
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--pretty=<key>::
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Pretty printing style. key: normal, raw
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--stdio:: Use the stdio interface.
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--tui:: Use the TUI interface, that is integrated with annotate and allows
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zooming into DSOs or threads, among other features. Use of --tui
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requires a tty, if one is not present, as when piping to other
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commands, the stdio interface is used.
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--gtk:: Use the GTK2 interface.
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-k::
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--vmlinux=<file>::
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vmlinux pathname
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--kallsyms=<file>::
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kallsyms pathname
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-m::
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--modules::
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Load module symbols. WARNING: This should only be used with -k and
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a LIVE kernel.
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-f::
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--force::
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Don't complain, do it.
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--symfs=<directory>::
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Look for files with symbols relative to this directory.
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-C::
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--cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can
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be provided as a comma-separated list with no space: 0,1. Ranges of
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CPUs are specified with -: 0-2. Default is to report samples on all
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CPUs.
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-M::
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--disassembler-style=:: Set disassembler style for objdump.
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--source::
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Interleave source code with assembly code. Enabled by default,
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disable with --no-source.
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--asm-raw::
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Show raw instruction encoding of assembly instructions.
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--show-total-period:: Show a column with the sum of periods.
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-I::
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--show-info::
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Display extended information about the perf.data file. This adds
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information which may be very large and thus may clutter the display.
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It currently includes: cpu and numa topology of the host system.
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-b::
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--branch-stack::
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Use the addresses of sampled taken branches instead of the instruction
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address to build the histograms. To generate meaningful output, the
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perf.data file must have been obtained using perf record -b or
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perf record --branch-filter xxx where xxx is a branch filter option.
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perf report is able to auto-detect whether a perf.data file contains
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branch stacks and it will automatically switch to the branch view mode,
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unless --no-branch-stack is used.
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--objdump=<path>::
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Path to objdump binary.
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--group::
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Show event group information together.
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--demangle::
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Demangle symbol names to human readable form. It's enabled by default,
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disable with --no-demangle.
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--percent-limit::
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Do not show entries which have an overhead under that percent.
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(Default: 0).
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--header::
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Show header information in the perf.data file. This includes
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various information like hostname, OS and perf version, cpu/mem
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info, perf command line, event list and so on. Currently only
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--stdio output supports this feature.
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--header-only::
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Show only perf.data header (forces --stdio).
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SEE ALSO
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--------
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linkperf:perf-stat[1], linkperf:perf-annotate[1]
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