https://github.com/torvalds/linux
- HEAD
- refs/heads/arm64-uaccess
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/certifi-2024.7.4
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/idna-3.7
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/requests-2.32.2
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/setuptools-70.0.0
- refs/heads/dependabot/pip/drivers/gpu/drm/ci/xfails/urllib3-2.2.2
- refs/heads/master
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Tip revision: e07cccf4046978df10f2e13fe2b99b2f9b3a65db authored by Linus Torvalds on 05 September 2009, 23:38:12 UTC
Linux 2.6.31-rc9
Linux 2.6.31-rc9
Tip revision: e07cccf
perf-top.txt
perf-top(1)
===========
NAME
----
perf-top - System profiling tool.
SYNOPSIS
--------
[verse]
'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.
SEE ALSO
--------
linkperf:perf-stat[1], linkperf:perf-list[1]