Provided by: linux-tools-common_3.13.0-24.46_all
perf-top - System profiling tool.
perf top [-e <EVENT> | --event=EVENT] [<options>]
This command generates and displays a performance counter profile in real time.
-a, --all-cpus System-wide collection. (default) -c <count>, --count=<count> Event period to sample. -C <cpu-list>, --cpu=<cpu> Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. Default is to monitor all CPUS. -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. -g, --group Put the counters into a counter group. -F <freq>, --freq=<freq> Profile at this frequency. -i, --inherit Child tasks do not inherit counters. -k <path>, --vmlinux=<path> Path to vmlinux. Required for annotation functionality. -m <pages>, --mmap-pages=<pages> Number of mmap data pages (must be a power of two) or size specification with appended unit character - B/K/M/G. The size is rounded up to have nearest pages power of two value. -p <pid>, --pid=<pid> Profile events on existing Process ID (comma separated list). -t <tid>, --tid=<tid> Profile events on existing thread ID (comma separated list). -u, --uid= Record events in threads owned by uid. Name or number. -r <priority>, --realtime=<priority> Collect data with this RT SCHED_FIFO priority. -s <symbol>, --sym-annotate=<symbol> Annotate this symbol. -K, --hide_kernel_symbols Hide kernel symbols. -U, --hide_user_symbols Hide user symbols. -D, --dump-symtab Dump the symbol table used for profiling. -v, --verbose Be more verbose (show counter open errors, etc). -z, --zero Zero history across display updates. -s, --sort Sort by key(s): pid, comm, dso, symbol, parent, srcline, weight, local_weight, abort, in_tx, transaction -n, --show-nr-samples Show a column with the number of samples. --show-total-period Show a column with the sum of periods. --dsos Only consider symbols in these dsos. --comms Only consider symbols in these comms. --symbols Only consider these symbols. -M, --disassembler-style= Set disassembler style for objdump. --source Interleave source code with assembly code. Enabled by default, disable with --no-source. --asm-raw Show raw instruction encoding of assembly instructions. -G Enables call-graph (stack chain/backtrace) recording. --call-graph Setup and enable call-graph (stack chain/backtrace) recording, implies -G. --max-stack Set the stack depth limit when parsing the callchain, anything beyond the specified depth will be ignored. This is a trade-off between information loss and faster processing especially for workloads that can have a very long callchain stack. Default: 127 --ignore-callees=<regex> Ignore callees of the function(s) matching the given regex. This has the effect of collecting the callers of each such function into one place in the call-graph tree. --percent-limit Do not show entries which have an overhead under that percent. (Default: 0).
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. [z] Toggle event count zeroing across display updates. [qQ] Quit. Pressing any unmapped key displays a menu, and prompts for input.