perf_2.6.32-top1
System profiling tool.
Usage
perf top
[{-e
<EVENT> | --event=EVENT}]
[<options>]
Overview
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.