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         If --mem-mode option is used, following sort keys are also available
 121         (incompatible with --branch-stack):
 122         symbol_daddr, dso_daddr, locked, tlb, mem, snoop, dcacheline.
 123
 124         - symbol_daddr: name of data symbol being executed on at the time of sample
 125         - dso_daddr: name of library or module containing the data being executed
 126         on at the time of sample
 127         - locked: whether the bus was locked at the time of sample
 128         - tlb: type of tlb access for the data at the time of sample
 129         - mem: type of memory access for the data at the time of sample
 130         - snoop: type of snoop (if any) for the data at the time of sample
 131         - dcacheline: the cacheline the data address is on at the time of sample
 132
 133         And default sort keys are changed to local_weight, mem, sym, dso,
 134         symbol_daddr, dso_daddr, snoop, tlb, locked, see '--mem-mode'.
 135
 136 -p::
 137 --parent=<regex>::
 138         A regex filter to identify parent. The parent is a caller of this
 139         function and searched through the callchain, thus it requires callchain
 140         information recorded. The pattern is in the exteneded regex format and
 141         defaults to "\^sys_|^do_page_fault", see '--sort parent'.
 142
 143 -x::
 144 --exclude-other::
 145         Only display entries with parent-match.
 146
 147 -w::
 148 --column-widths=<width[,width...]>::
 149         Force each column width to the provided list, for large terminal
 150         readability.  0 means no limit (default behavior).
 151
 152 -t::
 153 --field-separator=::
 154         Use a special separator character and don't pad with spaces, replacing
 155         all occurrences of this separator in symbol names (and other output)
 156         with a '.' character, that thus it's the only non valid separator.
 157
 158 -D::
 159 --dump-raw-trace::
 160         Dump raw trace in ASCII.
 161
 162 -g [type,min[,limit],order[,key][,branch]]::
 163 --call-graph::
 164         Display call chains using type, min percent threshold, optional print
 165         limit and order.
 166         type can be either:
 167         - flat: single column, linear exposure of call chains.
 168         - graph: use a graph tree, displaying absolute overhead rates.
 169         - fractal: like graph, but displays relative rates. Each branch of
 170                  the tree is considered as a new profiled object. +
 171
 172         order can be either:
 173         - callee: callee based call graph.
 174         - caller: inverted caller based call graph.
 175
 176         key can be:
 177         - function: compare on functions
 178         - address: compare on individual code addresses
 179
 180         branch can be:
 181         - branch: include last branch information in callgraph
 182         when available. Usually more convenient to use --branch-history
 183         for this.
 184
 185         Default: fractal,0.5,callee,function.
 186
 187 --children::
 188         Accumulate callchain of children to parent entry so that then can
 189         show up in the output.  The output will have a new "Children" column
 190         and will be sorted on the data.  It requires callchains are recorded.
 191
 192 --max-stack::
 193         Set the stack depth limit when parsing the callchain, anything
 194         beyond the specified depth will be ignored. This is a trade-off
 195         between information loss and faster processing especially for
 196         workloads that can have a very long callchain stack.
 197
 198         Default: 127
 199
 200 -G::
 201 --inverted::
 202         alias for inverted caller based call graph.
 203
 204 --ignore-callees=<regex>::
 205         Ignore callees of the function(s) matching the given regex.
 206         This has the effect of collecting the callers of each such
 207         function into one place in the call-graph tree.
 208
 209 --pretty=<key>::
 210         Pretty printing style.  key: normal, raw
 211
 212 --stdio:: Use the stdio interface.
 213
 214 --tui:: Use the TUI interface, that is integrated with annotate and allows
 215         zooming into DSOs or threads, among other features. Use of --tui
 216         requires a tty, if one is not present, as when piping to other
 217         commands, the stdio interface is used.
 218
 219 --gtk:: Use the GTK2 interface.
 220
 221 -k::
 222 --vmlinux=<file>::
 223         vmlinux pathname
 224
 225 --kallsyms=<file>::
 226         kallsyms pathname
 227
 228 -m::
 229 --modules::
 230         Load module symbols. WARNING: This should only be used with -k and
 231         a LIVE kernel.
 232
 233 -f::
 234 --force::
 235         Don't complain, do it.
 236
 237 --symfs=<directory>::
 238         Look for files with symbols relative to this directory.
 239
 240 -C::
 241 --cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can
 242         be provided as a comma-separated list with no space: 0,1. Ranges of
 243         CPUs are specified with -: 0-2. Default is to report samples on all
 244         CPUs.
 245
 246 -M::
 247 --disassembler-style=:: Set disassembler style for objdump.
 248
 249 --source::
 250         Interleave source code with assembly code. Enabled by default,
 251         disable with --no-source.
 252
 253 --asm-raw::
 254         Show raw instruction encoding of assembly instructions.
 255
 256 --show-total-period:: Show a column with the sum of periods.
 257
 258 -I::
 259 --show-info::
 260         Display extended information about the perf.data file. This adds
 261         information which may be very large and thus may clutter the display.
 262         It currently includes: cpu and numa topology of the host system.
 263
 264 -b::
 265 --branch-stack::
 266         Use the addresses of sampled taken branches instead of the instruction
 267         address to build the histograms. To generate meaningful output, the
 268         perf.data file must have been obtained using perf record -b or
 269         perf record --branch-filter xxx where xxx is a branch filter option.
 270         perf report is able to auto-detect whether a perf.data file contains
 271         branch stacks and it will automatically switch to the branch view mode,
 272         unless --no-branch-stack is used.
 273
 274 --branch-history::
 275         Add the addresses of sampled taken branches to the callstack.
 276         This allows to examine the path the program took to each sample.
 277         The data collection must have used -b (or -j) and -g.
 278
 279 --objdump=<path>::
 280         Path to objdump binary.
 281
 282 --group::
 283         Show event group information together.
 284
 285 --demangle::
 286         Demangle symbol names to human readable form. It's enabled by default,
 287         disable with --no-demangle.
 288
 289 --demangle-kernel::
 290         Demangle kernel symbol names to human readable form (for C++ kernels).
 291
 292 --mem-mode::
 293         Use the data addresses of samples in addition to instruction addresses
 294         to build the histograms.  To generate meaningful output, the perf.data
 295         file must have been obtained using perf record -d -W and using a
 296         special event -e cpu/mem-loads/ or -e cpu/mem-stores/. See
 297         'perf mem' for simpler access.
 298
 299 --percent-limit::
 300         Do not show entries which have an overhead under that percent.
 301         (Default: 0).
 302
 303 --percentage::
 304         Determine how to display the overhead percentage of filtered entries.
 305         Filters can be applied by --comms, --dsos and/or --symbols options and
 306         Zoom operations on the TUI (thread, dso, etc).
 307
 308         "relative" means it's relative to filtered entries only so that the
 309         sum of shown entries will be always 100%.  "absolute" means it retains
 310         the original value before and after the filter is applied.
 311
 312 --header::
 313         Show header information in the perf.data file.  This includes
 314         various information like hostname, OS and perf version, cpu/mem
 315         info, perf command line, event list and so on.  Currently only
 316         --stdio output supports this feature.
 317
 318 --header-only::
 319         Show only perf.data header (forces --stdio).
 320
 321 SEE ALSO
 322 --------
 323 linkperf:perf-stat[1], linkperf:perf-annotate[1]