NAME
perf-top - System profiling tool.
SYNOPSIS
perf top [-e <EVENT> | --event=EVENT] [<options>]
DESCRIPTION
This command generates and displays a performance counter profile in real time.
OPTIONS
- -a, --all-cpus
-
System-wide collection. (default)
- -c <count>, --count=<count>
-
Event period to sample.
- -C <cpu-list>, --cpu=<cpu>
-
Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. Default is to monitor all CPUS.
- -d <seconds>, --delay=<seconds>
-
Number of seconds to delay between refreshes.
- -e <event>, --event=<event>
-
Select the PMU event. Selection can be a symbolic event name (use perf list to list all events) or a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a hexadecimal event descriptor.
- -E <entries>, --entries=<entries>
-
Display this many functions.
- -f <count>, --count-filter=<count>
-
Only display functions with more events than this.
- -g, --group
-
Put the counters into a counter group.
- -F <freq>, --freq=<freq>
-
Profile at this frequency.
- -i, --inherit
-
Child tasks inherit counters, only makes sens with -p option.
- -k <path>, --vmlinux=<path>
-
Path to vmlinux. Required for annotation functionality.
- -m <pages>, --mmap-pages=<pages>
-
Number of mmapped data pages.
- -p <pid>, --pid=<pid>
-
Profile events on existing Process ID.
- -t <tid>, --tid=<tid>
-
Profile events on existing thread ID.
- -r <priority>, --realtime=<priority>
-
Collect data with this RT SCHED_FIFO priority.
- -s <symbol>, --sym-annotate=<symbol>
-
Annotate this symbol.
- -K, --hide_kernel_symbols
-
Hide kernel symbols.
- -U, --hide_user_symbols
-
Hide user symbols.
- -D, --dump-symtab
-
Dump the symbol table used for profiling.
- -v, --verbose
-
Be more verbose (show counter open errors, etc).
- -z, --zero
-
Zero history across display updates.
- -s, --sort
-
Sort by key(s): pid, comm, dso, symbol, parent
- -n, --show-nr-samples
-
Show a column with the number of samples.
- --show-total-period
-
Show a column with the sum of periods.
- --dsos
-
Only consider symbols in these dsos.
- --comms
-
Only consider symbols in these comms.
- --symbols
-
Only consider these symbols.
-M, --disassembler-style=
Set disassembler style for objdump.
- --source
-
Interleave source code with assembly code. Enabled by default, disable with --no-source.
- --asm-raw
-
Show raw instruction encoding of assembly instructions.
- -G [type,min,order], --call-graph
-
Display call chains using type, min percent threshold and order. type can be either:
• flat: single column, linear exposure of call chains.
• graph: use a graph tree, displaying absolute overhead rates.
• fractal: like graph, but displays relative rates. Each branch of the tree is considered as a new profiled object.
order can be either: - callee: callee based call graph. - caller: inverted caller based call graph.
Default: fractal,0.5,callee.
INTERACTIVE PROMPTING KEYS
[d]
Display refresh delay.
[e]
Number of entries to display.
[E]
Event to display when multiple counters are active.
[f]
Profile display filter (>= hit count).
[F]
Annotation display filter (>= % of total).
[s]
Annotate symbol.
[S]
Stop annotation, return to full profile display.
[z]
Toggle event count zeroing across display updates.
[qQ]
Quit.
Pressing any unmapped key displays a menu, and prompts for input.