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19d4ac3c10
Just like in 'perf report', but live. Still needs to decay the callchains, but already somewhat useful as-is. Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/n/tip-cj3rmaf5jpsvi3v0tf7t4uvp@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
179 lines
3.4 KiB
Text
179 lines
3.4 KiB
Text
perf-top(1)
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===========
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NAME
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----
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perf-top - System profiling tool.
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SYNOPSIS
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--------
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[verse]
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'perf top' [-e <EVENT> | --event=EVENT] [<options>]
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DESCRIPTION
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-----------
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This command generates and displays a performance counter profile in real time.
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OPTIONS
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-------
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-a::
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--all-cpus::
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System-wide collection. (default)
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-c <count>::
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--count=<count>::
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Event period to sample.
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-C <cpu-list>::
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--cpu=<cpu>::
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Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a
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comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2.
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Default is to monitor all CPUS.
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-d <seconds>::
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--delay=<seconds>::
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Number of seconds to delay between refreshes.
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-e <event>::
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--event=<event>::
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Select the PMU event. Selection can be a symbolic event name
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(use 'perf list' to list all events) or a raw PMU
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event (eventsel+umask) in the form of rNNN where NNN is a
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hexadecimal event descriptor.
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-E <entries>::
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--entries=<entries>::
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Display this many functions.
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-f <count>::
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--count-filter=<count>::
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Only display functions with more events than this.
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-g::
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--group::
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Put the counters into a counter group.
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-F <freq>::
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--freq=<freq>::
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Profile at this frequency.
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-i::
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--inherit::
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Child tasks inherit counters, only makes sens with -p option.
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-k <path>::
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--vmlinux=<path>::
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Path to vmlinux. Required for annotation functionality.
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-m <pages>::
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--mmap-pages=<pages>::
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Number of mmapped data pages.
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-p <pid>::
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--pid=<pid>::
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Profile events on existing Process ID.
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-t <tid>::
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--tid=<tid>::
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Profile events on existing thread ID.
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-r <priority>::
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--realtime=<priority>::
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Collect data with this RT SCHED_FIFO priority.
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-s <symbol>::
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--sym-annotate=<symbol>::
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Annotate this symbol.
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-K::
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--hide_kernel_symbols::
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Hide kernel symbols.
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-U::
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--hide_user_symbols::
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Hide user symbols.
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-D::
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--dump-symtab::
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Dump the symbol table used for profiling.
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-v::
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--verbose::
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Be more verbose (show counter open errors, etc).
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-z::
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--zero::
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Zero history across display updates.
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-s::
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--sort::
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Sort by key(s): pid, comm, dso, symbol, parent
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-n::
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--show-nr-samples::
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Show a column with the number of samples.
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--show-total-period::
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Show a column with the sum of periods.
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--dsos::
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Only consider symbols in these dsos.
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--comms::
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Only consider symbols in these comms.
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--symbols::
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Only consider these symbols.
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-G [type,min,order]::
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--call-graph::
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Display call chains using type, min percent threshold and order.
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type can be either:
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- flat: single column, linear exposure of call chains.
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- graph: use a graph tree, displaying absolute overhead rates.
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- fractal: like graph, but displays relative rates. Each branch of
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the tree is considered as a new profiled object.
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order can be either:
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- callee: callee based call graph.
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- caller: inverted caller based call graph.
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Default: fractal,0.5,callee.
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INTERACTIVE PROMPTING KEYS
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--------------------------
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[d]::
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Display refresh delay.
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[e]::
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Number of entries to display.
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[E]::
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Event to display when multiple counters are active.
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[f]::
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Profile display filter (>= hit count).
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[F]::
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Annotation display filter (>= % of total).
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[s]::
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Annotate symbol.
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[S]::
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Stop annotation, return to full profile display.
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[z]::
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Toggle event count zeroing across display updates.
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[qQ]::
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Quit.
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Pressing any unmapped key displays a menu, and prompts for input.
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SEE ALSO
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--------
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linkperf:perf-stat[1], linkperf:perf-list[1]
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