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--group::
54        Put the counters into a counter group.
55
56-F <freq>::
57--freq=<freq>::
58	Profile at this frequency.
59
60-i::
61--inherit::
62	Child tasks do not inherit counters.
63
64-k <path>::
65--vmlinux=<path>::
66	Path to vmlinux.  Required for annotation functionality.
67
68-m <pages>::
69--mmap-pages=<pages>::
70	Number of mmap data pages (must be a power of two) or size
71	specification with appended unit character - B/K/M/G. The
72	size is rounded up to have nearest pages power of two value.
73
74-p <pid>::
75--pid=<pid>::
76	Profile events on existing Process ID (comma separated list).
77
78-t <tid>::
79--tid=<tid>::
80        Profile events on existing thread ID (comma separated list).
81
82-u::
83--uid=::
84        Record events in threads owned by uid. Name or number.
85
86-r <priority>::
87--realtime=<priority>::
88	Collect data with this RT SCHED_FIFO priority.
89
90--sym-annotate=<symbol>::
91        Annotate this symbol.
92
93-K::
94--hide_kernel_symbols::
95        Hide kernel symbols.
96
97-U::
98--hide_user_symbols::
99        Hide user symbols.
100
101-D::
102--dump-symtab::
103        Dump the symbol table used for profiling.
104
105-v::
106--verbose::
107	Be more verbose (show counter open errors, etc).
108
109-z::
110--zero::
111	Zero history across display updates.
112
113-s::
114--sort::
115	Sort by key(s): pid, comm, dso, symbol, parent, srcline, weight,
116	local_weight, abort, in_tx, transaction
117
118-n::
119--show-nr-samples::
120	Show a column with the number of samples.
121
122--show-total-period::
123	Show a column with the sum of periods.
124
125--dsos::
126	Only consider symbols in these dsos.
127
128--comms::
129	Only consider symbols in these comms.
130
131--symbols::
132	Only consider these symbols.
133
134-M::
135--disassembler-style=:: Set disassembler style for objdump.
136
137--source::
138	Interleave source code with assembly code. Enabled by default,
139	disable with --no-source.
140
141--asm-raw::
142	Show raw instruction encoding of assembly instructions.
143
144-g::
145	Enables call-graph (stack chain/backtrace) recording.
146
147--call-graph::
148	Setup and enable call-graph (stack chain/backtrace) recording,
149	implies -g.
150
151--max-stack::
152	Set the stack depth limit when parsing the callchain, anything
153	beyond the specified depth will be ignored. This is a trade-off
154	between information loss and faster processing especially for
155	workloads that can have a very long callchain stack.
156
157	Default: 127
158
159--ignore-callees=<regex>::
160        Ignore callees of the function(s) matching the given regex.
161        This has the effect of collecting the callers of each such
162        function into one place in the call-graph tree.
163
164--percent-limit::
165	Do not show entries which have an overhead under that percent.
166	(Default: 0).
167
168INTERACTIVE PROMPTING KEYS
169--------------------------
170
171[d]::
172	Display refresh delay.
173
174[e]::
175	Number of entries to display.
176
177[E]::
178	Event to display when multiple counters are active.
179
180[f]::
181	Profile display filter (>= hit count).
182
183[F]::
184	Annotation display filter (>= % of total).
185
186[s]::
187	Annotate symbol.
188
189[S]::
190	Stop annotation, return to full profile display.
191
192[z]::
193	Toggle event count zeroing across display updates.
194
195[qQ]::
196	Quit.
197
198Pressing any unmapped key displays a menu, and prompts for input.
199
200
201SEE ALSO
202--------
203linkperf:perf-stat[1], linkperf:perf-list[1]
204