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 -n::
  29 --show-nr-samples::
  30         Show the number of samples for each symbol
  31
  32 --showcpuutilization::
  33         Show sample percentage for different cpu modes.
  34
  35 -T::
  36 --threads::
  37         Show per-thread event counters
  38 -c::
  39 --comms=::
  40         Only consider symbols in these comms. CSV that understands
  41         file://filename entries.  This option will affect the percentage of
  42         the overhead column.  See --percentage for more info.
  43 -d::
  44 --dsos=::
  45         Only consider symbols in these dsos. CSV that understands
  46         file://filename entries.  This option will affect the percentage of
  47         the overhead column.  See --percentage for more info.
  48 -S::
  49 --symbols=::
  50         Only consider these symbols. CSV that understands
  51         file://filename entries.  This option will affect the percentage of
  52         the overhead column.  See --percentage for more info.
  53
  54 --symbol-filter=::
  55         Only show symbols that match (partially) with this filter.
  56
  57 -U::
  58 --hide-unresolved::
  59         Only display entries resolved to a symbol.
  60
  61 -s::
  62 --sort=::
  63         Sort histogram entries by given key(s) - multiple keys can be specified
  64         in CSV format.  Following sort keys are available:
  65         pid, comm, dso, symbol, parent, cpu, srcline, weight, local_weight.
  66
  67         Each key has following meaning:
  68
  69         - comm: command (name) of the task which can be read via /proc/<pid>/comm
  70         - pid: command and tid of the task
  71         - dso: name of library or module executed at the time of sample
  72         - symbol: name of function executed at the time of sample
  73         - parent: name of function matched to the parent regex filter. Unmatched
  74         entries are displayed as "[other]".
  75         - cpu: cpu number the task ran at the time of sample
  76         - srcline: filename and line number executed at the time of sample.  The
  77         DWARF debugging info must be provided.
  78         - weight: Event specific weight, e.g. memory latency or transaction
  79         abort cost. This is the global weight.
  80         - local_weight: Local weight version of the weight above.
  81         - transaction: Transaction abort flags.
  82         - overhead: Overhead percentage of sample
  83         - overhead_sys: Overhead percentage of sample running in system mode
  84         - overhead_us: Overhead percentage of sample running in user mode
  85         - overhead_guest_sys: Overhead percentage of sample running in system mode
  86         on guest machine
  87         - overhead_guest_us: Overhead percentage of sample running in user mode on
  88         guest machine
  89         - sample: Number of sample
  90         - period: Raw number of event count of sample
  91
  92         By default, comm, dso and symbol keys are used.
  93         (i.e. --sort comm,dso,symbol)
  94
  95         If --branch-stack option is used, following sort keys are also
  96         available:
  97         dso_from, dso_to, symbol_from, symbol_to, mispredict.
  98
  99         - dso_from: name of library or module branched from
 100         - dso_to: name of library or module branched to
 101         - symbol_from: name of function branched from
 102         - symbol_to: name of function branched to
 103         - mispredict: "N" for predicted branch, "Y" for mispredicted branch
 104         - in_tx: branch in TSX transaction
 105         - abort: TSX transaction abort.
 106
 107         And default sort keys are changed to comm, dso_from, symbol_from, dso_to
 108         and symbol_to, see '--branch-stack'.
 109
 110 -F::
 111 --fields=::
 112         Specify output field - multiple keys can be specified in CSV format.
 113         Following fields are available:
 114         overhead, overhead_sys, overhead_us, overhead_children, sample and period.
 115         Also it can contain any sort key(s).
 116
 117         By default, every sort keys not specified in -F will be appended
 118         automatically.
 119
 120 -p::
 121 --parent=<regex>::
 122         A regex filter to identify parent. The parent is a caller of this
 123         function and searched through the callchain, thus it requires callchain
 124         information recorded. The pattern is in the exteneded regex format and
 125         defaults to "\^sys_|^do_page_fault", see '--sort parent'.
 126
 127 -x::
 128 --exclude-other::
 129         Only display entries with parent-match.
 130
 131 -w::
 132 --column-widths=<width[,width...]>::
 133         Force each column width to the provided list, for large terminal
 134         readability.
 135
 136 -t::
 137 --field-separator=::
 138         Use a special separator character and don't pad with spaces, replacing
 139         all occurrences of this separator in symbol names (and other output)
 140         with a '.' character, that thus it's the only non valid separator.
 141
 142 -D::
 143 --dump-raw-trace::
 144         Dump raw trace in ASCII.
 145
 146 -g [type,min[,limit],order[,key]]::
 147 --call-graph::
 148         Display call chains using type, min percent threshold, optional print
 149         limit and order.
 150         type can be either:
 151         - flat: single column, linear exposure of call chains.
 152         - graph: use a graph tree, displaying absolute overhead rates.
 153         - fractal: like graph, but displays relative rates. Each branch of
 154                  the tree is considered as a new profiled object. +
 155
 156         order can be either:
 157         - callee: callee based call graph.
 158         - caller: inverted caller based call graph.
 159
 160         key can be:
 161         - function: compare on functions
 162         - address: compare on individual code addresses
 163
 164         Default: fractal,0.5,callee,function.
 165
 166 --children::
 167         Accumulate callchain of children to parent entry so that then can
 168         show up in the output.  The output will have a new "Children" column
 169         and will be sorted on the data.  It requires callchains are recorded.
 170
 171 --max-stack::
 172         Set the stack depth limit when parsing the callchain, anything
 173         beyond the specified depth will be ignored. This is a trade-off
 174         between information loss and faster processing especially for
 175         workloads that can have a very long callchain stack.
 176
 177         Default: 127
 178
 179 -G::
 180 --inverted::
 181         alias for inverted caller based call graph.
 182
 183 --ignore-callees=<regex>::
 184         Ignore callees of the function(s) matching the given regex.
 185         This has the effect of collecting the callers of each such
 186         function into one place in the call-graph tree.
 187
 188 --pretty=<key>::
 189         Pretty printing style.  key: normal, raw
 190
 191 --stdio:: Use the stdio interface.
 192
 193 --tui:: Use the TUI interface, that is integrated with annotate and allows
 194         zooming into DSOs or threads, among other features. Use of --tui
 195         requires a tty, if one is not present, as when piping to other
 196         commands, the stdio interface is used.
 197
 198 --gtk:: Use the GTK2 interface.
 199
 200 -k::
 201 --vmlinux=<file>::
 202         vmlinux pathname
 203
 204 --kallsyms=<file>::
 205         kallsyms pathname
 206
 207 -m::
 208 --modules::
 209         Load module symbols. WARNING: This should only be used with -k and
 210         a LIVE kernel.
 211
 212 -f::
 213 --force::
 214         Don't complain, do it.
 215
 216 --symfs=<directory>::
 217         Look for files with symbols relative to this directory.
 218
 219 -C::
 220 --cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can
 221         be provided as a comma-separated list with no space: 0,1. Ranges of
 222         CPUs are specified with -: 0-2. Default is to report samples on all
 223         CPUs.
 224
 225 -M::
 226 --disassembler-style=:: Set disassembler style for objdump.
 227
 228 --source::
 229         Interleave source code with assembly code. Enabled by default,
 230         disable with --no-source.
 231
 232 --asm-raw::
 233         Show raw instruction encoding of assembly instructions.
 234
 235 --show-total-period:: Show a column with the sum of periods.
 236
 237 -I::
 238 --show-info::
 239         Display extended information about the perf.data file. This adds
 240         information which may be very large and thus may clutter the display.
 241         It currently includes: cpu and numa topology of the host system.
 242
 243 -b::
 244 --branch-stack::
 245         Use the addresses of sampled taken branches instead of the instruction
 246         address to build the histograms. To generate meaningful output, the
 247         perf.data file must have been obtained using perf record -b or
 248         perf record --branch-filter xxx where xxx is a branch filter option.
 249         perf report is able to auto-detect whether a perf.data file contains
 250         branch stacks and it will automatically switch to the branch view mode,
 251         unless --no-branch-stack is used.
 252
 253 --objdump=<path>::
 254         Path to objdump binary.
 255
 256 --group::
 257         Show event group information together.
 258
 259 --demangle::
 260         Demangle symbol names to human readable form. It's enabled by default,
 261         disable with --no-demangle.
 262
 263 --percent-limit::
 264         Do not show entries which have an overhead under that percent.
 265         (Default: 0).
 266
 267 --percentage::
 268         Determine how to display the overhead percentage of filtered entries.
 269         Filters can be applied by --comms, --dsos and/or --symbols options and
 270         Zoom operations on the TUI (thread, dso, etc).
 271
 272         "relative" means it's relative to filtered entries only so that the
 273         sum of shown entries will be always 100%.  "absolute" means it retains
 274         the original value before and after the filter is applied.
 275
 276 --header::
 277         Show header information in the perf.data file.  This includes
 278         various information like hostname, OS and perf version, cpu/mem
 279         info, perf command line, event list and so on.  Currently only
 280         --stdio output supports this feature.
 281
 282 --header-only::
 283         Show only perf.data header (forces --stdio).
 284
 285 SEE ALSO
 286 --------
 287 linkperf:perf-stat[1], linkperf:perf-annotate[1]