PERF_3.2-TOP(1) perf Manual PERF_3.2-TOP(1)
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:
o flat: single column, linear exposure of call chains.
o graph: use a graph tree, displaying absolute overhead rates.
o 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.
SEE ALSO
perf_3.2-stat(1), perf_3.2-list(1)
perf 06/24/2012 PERF_3.2-TOP(1)