# perf top 使用方法
###### tags: `linux2022`
先輸入
`$ perf top list`
看 `perf top` 指令有哪些設定參數
```
$ perf top list
Usage: perf top [<options>] //其中[<options>] 裡面就是可選擇輸入以下參數
-a, --all-cpus system-wide collection from all CPUs
-b, --branch-any sample any taken branches
-c, --count <n> event period to sample
-C, --cpu <cpu> list of cpus to monitor
-d, --delay <n> number of seconds to delay between refreshes
-D, --dump-symtab dump the symbol table used for profiling
-E, --entries <n> display this many functions
-e, --event <event> event selector. use 'perf list' to list available events
-f, --count-filter <n>
only display functions with more events than this
-F, --freq <freq or 'max'>
profile at this frequency
-g enables call-graph recording and display
-i, --no-inherit child tasks do not inherit counters
-j, --branch-filter <branch filter mask>
branch stack filter modes
-K, --hide_kernel_symbols
hide kernel symbols
-k, --vmlinux <file> vmlinux pathname
-M, --disassembler-style <disassembler style>
Specify disassembler style (e.g. -M intel for intel syntax)
-m, --mmap-pages <pages>
number of mmap data pages
-n, --show-nr-samples
Show a column with the number of samples
-p, --pid <pid> profile events on existing process id
-r, --realtime <n> collect data with this RT SCHED_FIFO priority
-s, --sort <key[,key2...]>
sort by key(s): pid, comm, dso, symbol, parent, cpu, srcline, ... Please refer the man page for the complete list.
-t, --tid <tid> profile events on existing thread id
-U, --hide_user_symbols
hide user symbols
-u, --uid <user> user to profile
-v, --verbose be more verbose (show counter open errors, etc)
-w, --column-widths <width[,width...]>
don't try to adjust column width, use these fixed values
-z, --zero zero history across updates
--asm-raw Display raw encoding of assembly instructions (default)
--call-graph <record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]>
setup and enables call-graph (stack chain/backtrace):
record_mode: call graph recording mode (fp|dwarf|lbr)
record_size: if record_mode is 'dwarf', max size of stack recording (<bytes>)
default: 8192 (bytes)
print_type: call graph printing style (graph|flat|fractal|folded|none)
threshold: minimum call graph inclusion threshold (<percent>)
print_limit: maximum number of call graph entry (<number>)
order: call graph order (caller|callee)
sort_key: call graph sort key (function|address)
branch: include last branch info to call graph (branch)
value: call graph value (percent|period|count)
Default: fp,graph,0.5,caller,function
--children Accumulate callchains of children and show total overhead as well
--comms <comm[,comm...]>
only consider symbols in these comms
--demangle-kernel
Enable kernel symbol demangling
--dsos <dso[,dso...]>
only consider symbols in these dsos
--fields <key[,keys...]>
output field(s): overhead, period, sample plus all of sort keys
--force don't complain, do it
--group put the counters into a counter group
--hierarchy Show entries in a hierarchy
-v, --verbose be more verbose (show counter open errors, etc)
-w, --column-widths <width[,width...]>
don't try to adjust column width, use these fixed values
-z, --zero zero history across updates
--asm-raw Display raw encoding of assembly instructions (default)
--call-graph <record_mode[,record_size],print_type,threshold[,print_limit],order,sort_key[,branch]>
setup and enables call-graph (stack chain/backtrace):
record_mode: call graph recording mode (fp|dwarf|lbr)
record_size: if record_mode is 'dwarf', max size of stack recording (<bytes>)
default: 8192 (bytes)
print_type: call graph printing style (graph|flat|fractal|folded|none)
threshold: minimum call graph inclusion threshold (<percent>)
print_limit: maximum number of call graph entry (<number>)
order: call graph order (caller|callee)
sort_key: call graph sort key (function|address)
branch: include last branch info to call graph (branch)
value: call graph value (percent|period|count)
Default: fp,graph,0.5,caller,function
--children Accumulate callchains of children and show total overhead as well
--comms <comm[,comm...]>
only consider symbols in these comms
--demangle-kernel
Enable kernel symbol demangling
--dsos <dso[,dso...]>
only consider symbols in these dsos
--fields <key[,keys...]>
output field(s): overhead, period, sample plus all of sort keys
--force don't complain, do it
--group put the counters into a counter group
--hierarchy Show entries in a hierarchy
--ignore-callees <regex>
ignore callees of these functions in call graphs
--ignore-vmlinux don't load vmlinux even if found
--kallsyms <file>
kallsyms pathname
--max-stack <n> Set the maximum stack depth when parsing the callchain. Default: kernel.perf_event_max_stack or 127
--namespaces Record namespaces events
--no-bpf-event do not record bpf events
--num-thread-synthesize <n>
number of thread to run event synthesize
--objdump <path> objdump binary to use for disassembly and annotations
--overwrite Use a backward ring buffer, default: no
--percent-limit <percent>
Don't show entries under that percent
--percentage <relative|absolute>
How to display percentage of filtered entries
--proc-map-timeout <n>
per thread proc mmap processing timeout in ms
--raw-trace Show raw trace event output (do not use print fmt or plugins)
--show-on-off-events
Show the on/off switch events, used with --switch-on and --switch-off
--show-total-period
Show a column with the sum of periods
--source Interleave source code with assembly code (default)
--stdio Use the stdio interface
--switch-off <event>
Stop considering events after the ocurrence of this event
--switch-on <event>
Consider events after the ocurrence of this event
--sym-annotate <symbol name>
symbol to annotate
--symbols <symbol[,symbol...]>
only consider these symbols
--tui Use the TUI interface
(END)
```
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