PERF\-TOP

Section: perf Manual (1)
Updated: 12/21/2009
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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.