tools/perf/Documentation/perf-report.txt

   1 perf-report(1)
   2 ==============
   3
   4 NAME
   5 ----
   6 perf-report - Read perf.data (created by perf record) and display the profile
   7
   8 SYNOPSIS
   9 --------
  10 [verse]
  11 'perf report' [-i <file> | --input=file]
  12
  13 DESCRIPTION
  14 -----------
  15 This command displays the performance counter profile information recorded
  16 via perf record.
  17
  18 OPTIONS
  19 -------
  20 -i::
  21 --input=::
  22         Input file name. (default: perf.data unless stdin is a fifo)
  23
  24 -v::
  25 --verbose::
  26         Be more verbose. (show symbol address, etc)
  27
  28 -d::
  29 --dsos=::
  30         Only consider symbols in these dsos. CSV that understands
  31         file://filename entries.
  32 -n::
  33 --show-nr-samples::
  34         Show the number of samples for each symbol
  35
  36 --showcpuutilization::
  37         Show sample percentage for different cpu modes.
  38
  39 -T::
  40 --threads::
  41         Show per-thread event counters
  42 -c::
  43 --comms=::
  44         Only consider symbols in these comms. CSV that understands
  45         file://filename entries.
  46 -S::
  47 --symbols=::
  48         Only consider these symbols. CSV that understands
  49         file://filename entries.
  50
  51 --symbol-filter=::
  52         Only show symbols that match (partially) with this filter.
  53
  54 -U::
  55 --hide-unresolved::
  56         Only display entries resolved to a symbol.
  57
  58 -s::
  59 --sort=::
  60         Sort histogram entries by given key(s) - multiple keys can be specified
  61         in CSV format.  Following sort keys are available:
  62         pid, comm, dso, symbol, parent, cpu, srcline, weight, local_weight.
  63
  64         Each key has following meaning:
  65
  66         - comm: command (name) of the task which can be read via /proc/<pid>/comm
  67         - pid: command and tid of the task
  68         - dso: name of library or module executed at the time of sample
  69         - symbol: name of function executed at the time of sample
  70         - parent: name of function matched to the parent regex filter. Unmatched
  71         entries are displayed as "[other]".
  72         - cpu: cpu number the task ran at the time of sample
  73         - srcline: filename and line number executed at the time of sample.  The
  74         DWARF debugging info must be provided.
  75         - weight: Event specific weight, e.g. memory latency or transaction
  76         abort cost. This is the global weight.
  77         - local_weight: Local weight version of the weight above.
  78         - transaction: Transaction abort flags.
  79
  80         By default, comm, dso and symbol keys are used.
  81         (i.e. --sort comm,dso,symbol)
  82
  83         If --branch-stack option is used, following sort keys are also
  84         available:
  85         dso_from, dso_to, symbol_from, symbol_to, mispredict.
  86
  87         - dso_from: name of library or module branched from
  88         - dso_to: name of library or module branched to
  89         - symbol_from: name of function branched from
  90         - symbol_to: name of function branched to
  91         - mispredict: "N" for predicted branch, "Y" for mispredicted branch
  92         - in_tx: branch in TSX transaction
  93         - abort: TSX transaction abort.
  94
  95         And default sort keys are changed to comm, dso_from, symbol_from, dso_to
  96         and symbol_to, see '--branch-stack'.
  97
  98 -p::
  99 --parent=<regex>::
 100         A regex filter to identify parent. The parent is a caller of this
 101         function and searched through the callchain, thus it requires callchain
 102         information recorded. The pattern is in the exteneded regex format and
 103         defaults to "\^sys_|^do_page_fault", see '--sort parent'.
 104
 105 -x::
 106 --exclude-other::
 107         Only display entries with parent-match.
 108
 109 -w::
 110 --column-widths=<width[,width...]>::
 111         Force each column width to the provided list, for large terminal
 112         readability.
 113
 114 -t::
 115 --field-separator=::
 116         Use a special separator character and don't pad with spaces, replacing
 117         all occurrences of this separator in symbol names (and other output)
 118         with a '.' character, that thus it's the only non valid separator.
 119
 120 -D::
 121 --dump-raw-trace::
 122         Dump raw trace in ASCII.
 123
 124 -g [type,min[,limit],order[,key]]::
 125 --call-graph::
 126         Display call chains using type, min percent threshold, optional print
 127         limit and order.
 128         type can be either:
 129         - flat: single column, linear exposure of call chains.
 130         - graph: use a graph tree, displaying absolute overhead rates.
 131         - fractal: like graph, but displays relative rates. Each branch of
 132                  the tree is considered as a new profiled object. +
 133
 134         order can be either:
 135         - callee: callee based call graph.
 136         - caller: inverted caller based call graph.
 137
 138         key can be:
 139         - function: compare on functions
 140         - address: compare on individual code addresses
 141
 142         Default: fractal,0.5,callee,function.
 143
 144 --max-stack::
 145         Set the stack depth limit when parsing the callchain, anything
 146         beyond the specified depth will be ignored. This is a trade-off
 147         between information loss and faster processing especially for
 148         workloads that can have a very long callchain stack.
 149
 150         Default: 127
 151
 152 -G::
 153 --inverted::
 154         alias for inverted caller based call graph.
 155
 156 --ignore-callees=<regex>::
 157         Ignore callees of the function(s) matching the given regex.
 158         This has the effect of collecting the callers of each such
 159         function into one place in the call-graph tree.
 160
 161 --pretty=<key>::
 162         Pretty printing style.  key: normal, raw
 163
 164 --stdio:: Use the stdio interface.
 165
 166 --tui:: Use the TUI interface, that is integrated with annotate and allows
 167         zooming into DSOs or threads, among other features. Use of --tui
 168         requires a tty, if one is not present, as when piping to other
 169         commands, the stdio interface is used.
 170
 171 --gtk:: Use the GTK2 interface.
 172
 173 -k::
 174 --vmlinux=<file>::
 175         vmlinux pathname
 176
 177 --kallsyms=<file>::
 178         kallsyms pathname
 179
 180 -m::
 181 --modules::
 182         Load module symbols. WARNING: This should only be used with -k and
 183         a LIVE kernel.
 184
 185 -f::
 186 --force::
 187         Don't complain, do it.
 188
 189 --symfs=<directory>::
 190         Look for files with symbols relative to this directory.
 191
 192 -C::
 193 --cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can
 194         be provided as a comma-separated list with no space: 0,1. Ranges of
 195         CPUs are specified with -: 0-2. Default is to report samples on all
 196         CPUs.
 197
 198 -M::
 199 --disassembler-style=:: Set disassembler style for objdump.
 200
 201 --source::
 202         Interleave source code with assembly code. Enabled by default,
 203         disable with --no-source.
 204
 205 --asm-raw::
 206         Show raw instruction encoding of assembly instructions.
 207
 208 --show-total-period:: Show a column with the sum of periods.
 209
 210 -I::
 211 --show-info::
 212         Display extended information about the perf.data file. This adds
 213         information which may be very large and thus may clutter the display.
 214         It currently includes: cpu and numa topology of the host system.
 215
 216 -b::
 217 --branch-stack::
 218         Use the addresses of sampled taken branches instead of the instruction
 219         address to build the histograms. To generate meaningful output, the
 220         perf.data file must have been obtained using perf record -b or
 221         perf record --branch-filter xxx where xxx is a branch filter option.
 222         perf report is able to auto-detect whether a perf.data file contains
 223         branch stacks and it will automatically switch to the branch view mode,
 224         unless --no-branch-stack is used.
 225
 226 --objdump=<path>::
 227         Path to objdump binary.
 228
 229 --group::
 230         Show event group information together.
 231
 232 --demangle::
 233         Demangle symbol names to human readable form. It's enabled by default,
 234         disable with --no-demangle.
 235
 236 --percent-limit::
 237         Do not show entries which have an overhead under that percent.
 238         (Default: 0).
 239
 240 SEE ALSO
 241 --------
 242 linkperf:perf-stat[1], linkperf:perf-annotate[1]