PERF-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
realtime.
OPTIONS
- -a, --all-cpus
- System-wide collection. (default)
- -c <count>, --count=<count>
- Event period to sample.
- -C <cpu>, --CPU=<cpu>
- CPU to profile.
- -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.
- -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 pid.
- -r <priority>, --realtime=<priority>
- Collect data with this RT SCHED_FIFO priority.
- -s <symbol>, --sym-annotate=<symbol>
- Annotate this symbol. Requires -k option.
- -v, --verbose
- Be more verbose (show counter open errors, etc).
- -z, --zero
- Zero history across display updates.
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.
- [w]
- Toggle between weighted sum and individual count[E]r profile.
- [z]
- Toggle event count zeroing across display updates.
- [qQ]
- Quit.
- Pressing any unmapped key displays a menu, and prompts for input.