6 perf-top - System profiling tool.
11 'perf top' [-e <EVENT> | --event=EVENT] [<options>]
15 This command generates and displays a performance counter profile in real time.
22 System-wide collection. (default)
26 Event period to sample.
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.
36 Number of seconds to delay between refreshes.
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.
47 Display this many functions.
50 --count-filter=<count>::
51 Only display functions with more events than this.
55 Put the counters into a counter group.
59 Profile at this frequency.
63 Child tasks do not inherit counters.
67 Path to vmlinux. Required for annotation functionality.
70 --mmap-pages=<pages>::
71 Number of mmap data pages (must be a power of two) or size
72 specification with appended unit character - B/K/M/G. The
73 size is rounded up to have nearest pages power of two value.
77 Profile events on existing Process ID (comma separated list).
81 Profile events on existing thread ID (comma separated list).
85 Record events in threads owned by uid. Name or number.
88 --realtime=<priority>::
89 Collect data with this RT SCHED_FIFO priority.
92 --sym-annotate=<symbol>::
96 --hide_kernel_symbols::
100 --hide_user_symbols::
105 Dump the symbol table used for profiling.
109 Be more verbose (show counter open errors, etc).
113 Zero history across display updates.
117 Sort by key(s): pid, comm, dso, symbol, parent, srcline, weight,
118 local_weight, abort, in_tx, transaction
122 Show a column with the number of samples.
124 --show-total-period::
125 Show a column with the sum of periods.
128 Only consider symbols in these dsos.
131 Only consider symbols in these comms.
134 Only consider these symbols.
137 --disassembler-style=:: Set disassembler style for objdump.
140 Interleave source code with assembly code. Enabled by default,
141 disable with --no-source.
144 Show raw instruction encoding of assembly instructions.
147 Enables call-graph (stack chain/backtrace) recording.
150 Setup and enable call-graph (stack chain/backtrace) recording,
154 Set the stack depth limit when parsing the callchain, anything
155 beyond the specified depth will be ignored. This is a trade-off
156 between information loss and faster processing especially for
157 workloads that can have a very long callchain stack.
161 --ignore-callees=<regex>::
162 Ignore callees of the function(s) matching the given regex.
163 This has the effect of collecting the callers of each such
164 function into one place in the call-graph tree.
167 Do not show entries which have an overhead under that percent.
170 INTERACTIVE PROMPTING KEYS
171 --------------------------
174 Display refresh delay.
177 Number of entries to display.
180 Event to display when multiple counters are active.
183 Profile display filter (>= hit count).
186 Annotation display filter (>= % of total).
192 Stop annotation, return to full profile display.
195 Toggle event count zeroing across display updates.
200 Pressing any unmapped key displays a menu, and prompts for input.
205 linkperf:perf-stat[1], linkperf:perf-list[1]