1 perf-top(1) 2 =========== 3 4 NAME 5 ---- 6 perf-top - System profiling tool. 7 8 SYNOPSIS 9 -------- 10 [verse] 11 'perf top' [-e <EVENT> | --event=EVENT] [<options>] 12 13 DESCRIPTION 14 ----------- 15 This command generates and displays a performance counter profile in real time. 16 17 18 OPTIONS 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>:: 30 Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a 31 comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. 32 Default 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 INTERACTIVE PROMPTING KEYS 110 -------------------------- 111 112 [d]:: 113 Display refresh delay. 114 115 [e]:: 116 Number of entries to display. 117 118 [E]:: 119 Event to display when multiple counters are active. 120 121 [f]:: 122 Profile display filter (>= hit count). 123 124 [F]:: 125 Annotation display filter (>= % of total). 126 127 [s]:: 128 Annotate symbol. 129 130 [S]:: 131 Stop annotation, return to full profile display. 132 133 [w]:: 134 Toggle between weighted sum and individual count[E]r profile. 135 136 [z]:: 137 Toggle event count zeroing across display updates. 138 139 [qQ]:: 140 Quit. 141 142 Pressing any unmapped key displays a menu, and prompts for input. 143 144 145 SEE ALSO 146 -------- 147 linkperf:perf-stat[1], linkperf:perf-list[1] 148