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 do not inherit counters.

       -k <path>, --vmlinux=<path>
           Path to vmlinux. Required for annotation functionality.

       -m <pages>, --mmap-pages=<pages>
           Number of mmap data pages (must be a power of two) or size specification with appended
           unit character - B/K/M/G. The size is rounded up to have nearest pages power of two
           value.

       -p <pid>, --pid=<pid>
           Profile events on existing Process ID (comma separated list).

       -t <tid>, --tid=<tid>
           Profile events on existing thread ID (comma separated list).

       -u, --uid=
           Record events in threads owned by uid. Name or number.

       -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, srcline, weight, local_weight, abort,
           in_tx, transaction

       -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
           Enables call-graph (stack chain/backtrace) recording.

       --call-graph
           Setup and enable call-graph (stack chain/backtrace) recording, implies -G.

       --max-stack
           Set the stack depth limit when parsing the callchain, anything beyond the specified
           depth will be ignored. This is a trade-off between information loss and faster
           processing especially for workloads that can have a very long callchain stack.

               Default: 127

       --ignore-callees=<regex>
           Ignore callees of the function(s) matching the given regex. This has the effect of
           collecting the callers of each such function into one place in the call-graph tree.

       --percent-limit
           Do not show entries which have an overhead under that percent. (Default: 0).

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-stat(1), perf-list(1)