1perf-top(1) 2=========== 3 4NAME 5---- 6perf-top - System profiling tool. 7 8SYNOPSIS 9-------- 10[verse] 11'perf top' [-e <EVENT> | --event=EVENT] [<options>] 12 13DESCRIPTION 14----------- 15This command generates and displays a performance counter profile in real time. 16 17 18OPTIONS 19------- 20-a:: 21--all-cpus:: 22 System-wide collection. (default) 23 24-c <count>:: 25--count=<count>:: 26 Event period to sample. 27 28-C <cpu-list>:: 29--cpu=<cpu>:: 30Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a 31comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. 32Default is to monitor all CPUS. 33 34-d <seconds>:: 35--delay=<seconds>:: 36 Number of seconds to delay between refreshes. 37 38-e <event>:: 39--event=<event>:: 40 Select the PMU event. Selection can be a symbolic event name 41 (use 'perf list' to list all events) or a raw PMU 42 event (eventsel+umask) in the form of rNNN where NNN is a 43 hexadecimal event descriptor. 44 45-E <entries>:: 46--entries=<entries>:: 47 Display this many functions. 48 49-f <count>:: 50--count-filter=<count>:: 51 Only display functions with more events than this. 52 53-g:: 54--group:: 55 Put the counters into a counter group. 56 57-F <freq>:: 58--freq=<freq>:: 59 Profile at this frequency. 60 61-i:: 62--inherit:: 63 Child tasks inherit counters, only makes sens with -p option. 64 65-k <path>:: 66--vmlinux=<path>:: 67 Path to vmlinux. Required for annotation functionality. 68 69-m <pages>:: 70--mmap-pages=<pages>:: 71 Number of mmapped data pages. 72 73-p <pid>:: 74--pid=<pid>:: 75 Profile events on existing Process ID. 76 77-t <tid>:: 78--tid=<tid>:: 79 Profile events on existing thread ID. 80 81-r <priority>:: 82--realtime=<priority>:: 83 Collect data with this RT SCHED_FIFO priority. 84 85-s <symbol>:: 86--sym-annotate=<symbol>:: 87 Annotate this symbol. 88 89-K:: 90--hide_kernel_symbols:: 91 Hide kernel symbols. 92 93-U:: 94--hide_user_symbols:: 95 Hide user symbols. 96 97-D:: 98--dump-symtab:: 99 Dump the symbol table used for profiling. 100 101-v:: 102--verbose:: 103 Be more verbose (show counter open errors, etc). 104 105-z:: 106--zero:: 107 Zero history across display updates. 108 109-s:: 110--sort:: 111 Sort by key(s): pid, comm, dso, symbol, parent 112 113-n:: 114--show-nr-samples:: 115 Show a column with the number of samples. 116 117--show-total-period:: 118 Show a column with the sum of periods. 119 120--dsos:: 121 Only consider symbols in these dsos. 122 123--comms:: 124 Only consider symbols in these comms. 125 126--symbols:: 127 Only consider these symbols. 128 129-M:: 130--disassembler-style=:: Set disassembler style for objdump. 131 132--source:: 133 Interleave source code with assembly code. Enabled by default, 134 disable with --no-source. 135 136--asm-raw:: 137 Show raw instruction encoding of assembly instructions. 138 139-G [type,min,order]:: 140--call-graph:: 141 Display call chains using type, min percent threshold and order. 142 type can be either: 143 - flat: single column, linear exposure of call chains. 144 - graph: use a graph tree, displaying absolute overhead rates. 145 - fractal: like graph, but displays relative rates. Each branch of 146 the tree is considered as a new profiled object. 147 148 order can be either: 149 - callee: callee based call graph. 150 - caller: inverted caller based call graph. 151 152 Default: fractal,0.5,callee. 153 154INTERACTIVE PROMPTING KEYS 155-------------------------- 156 157[d]:: 158 Display refresh delay. 159 160[e]:: 161 Number of entries to display. 162 163[E]:: 164 Event to display when multiple counters are active. 165 166[f]:: 167 Profile display filter (>= hit count). 168 169[F]:: 170 Annotation display filter (>= % of total). 171 172[s]:: 173 Annotate symbol. 174 175[S]:: 176 Stop annotation, return to full profile display. 177 178[z]:: 179 Toggle event count zeroing across display updates. 180 181[qQ]:: 182 Quit. 183 184Pressing any unmapped key displays a menu, and prompts for input. 185 186 187SEE ALSO 188-------- 189linkperf:perf-stat[1], linkperf:perf-list[1] 190