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perf-top

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.

-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.

SEE ALSO

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