1perf-report(1) 2============== 3 4NAME 5---- 6perf-report - Read perf.data (created by perf record) and display the profile 7 8SYNOPSIS 9-------- 10[verse] 11'perf report' [-i <file> | --input=file] 12 13DESCRIPTION 14----------- 15This command displays the performance counter profile information recorded 16via perf record. 17 18OPTIONS 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. 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]]:: 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 Default: fractal,0.5,callee,function. 181 182--children:: 183 Accumulate callchain of children to parent entry so that then can 184 show up in the output. The output will have a new "Children" column 185 and will be sorted on the data. It requires callchains are recorded. 186 187--max-stack:: 188 Set the stack depth limit when parsing the callchain, anything 189 beyond the specified depth will be ignored. This is a trade-off 190 between information loss and faster processing especially for 191 workloads that can have a very long callchain stack. 192 193 Default: 127 194 195-G:: 196--inverted:: 197 alias for inverted caller based call graph. 198 199--ignore-callees=<regex>:: 200 Ignore callees of the function(s) matching the given regex. 201 This has the effect of collecting the callers of each such 202 function into one place in the call-graph tree. 203 204--pretty=<key>:: 205 Pretty printing style. key: normal, raw 206 207--stdio:: Use the stdio interface. 208 209--tui:: Use the TUI interface, that is integrated with annotate and allows 210 zooming into DSOs or threads, among other features. Use of --tui 211 requires a tty, if one is not present, as when piping to other 212 commands, the stdio interface is used. 213 214--gtk:: Use the GTK2 interface. 215 216-k:: 217--vmlinux=<file>:: 218 vmlinux pathname 219 220--kallsyms=<file>:: 221 kallsyms pathname 222 223-m:: 224--modules:: 225 Load module symbols. WARNING: This should only be used with -k and 226 a LIVE kernel. 227 228-f:: 229--force:: 230 Don't complain, do it. 231 232--symfs=<directory>:: 233 Look for files with symbols relative to this directory. 234 235-C:: 236--cpu:: Only report samples for the list of CPUs provided. Multiple CPUs can 237 be provided as a comma-separated list with no space: 0,1. Ranges of 238 CPUs are specified with -: 0-2. Default is to report samples on all 239 CPUs. 240 241-M:: 242--disassembler-style=:: Set disassembler style for objdump. 243 244--source:: 245 Interleave source code with assembly code. Enabled by default, 246 disable with --no-source. 247 248--asm-raw:: 249 Show raw instruction encoding of assembly instructions. 250 251--show-total-period:: Show a column with the sum of periods. 252 253-I:: 254--show-info:: 255 Display extended information about the perf.data file. This adds 256 information which may be very large and thus may clutter the display. 257 It currently includes: cpu and numa topology of the host system. 258 259-b:: 260--branch-stack:: 261 Use the addresses of sampled taken branches instead of the instruction 262 address to build the histograms. To generate meaningful output, the 263 perf.data file must have been obtained using perf record -b or 264 perf record --branch-filter xxx where xxx is a branch filter option. 265 perf report is able to auto-detect whether a perf.data file contains 266 branch stacks and it will automatically switch to the branch view mode, 267 unless --no-branch-stack is used. 268 269--objdump=<path>:: 270 Path to objdump binary. 271 272--group:: 273 Show event group information together. 274 275--demangle:: 276 Demangle symbol names to human readable form. It's enabled by default, 277 disable with --no-demangle. 278 279--mem-mode:: 280 Use the data addresses of samples in addition to instruction addresses 281 to build the histograms. To generate meaningful output, the perf.data 282 file must have been obtained using perf record -d -W and using a 283 special event -e cpu/mem-loads/ or -e cpu/mem-stores/. See 284 'perf mem' for simpler access. 285 286--percent-limit:: 287 Do not show entries which have an overhead under that percent. 288 (Default: 0). 289 290--percentage:: 291 Determine how to display the overhead percentage of filtered entries. 292 Filters can be applied by --comms, --dsos and/or --symbols options and 293 Zoom operations on the TUI (thread, dso, etc). 294 295 "relative" means it's relative to filtered entries only so that the 296 sum of shown entries will be always 100%. "absolute" means it retains 297 the original value before and after the filter is applied. 298 299--header:: 300 Show header information in the perf.data file. This includes 301 various information like hostname, OS and perf version, cpu/mem 302 info, perf command line, event list and so on. Currently only 303 --stdio output supports this feature. 304 305--header-only:: 306 Show only perf.data header (forces --stdio). 307 308SEE ALSO 309-------- 310linkperf:perf-stat[1], linkperf:perf-annotate[1] 311