188 lines
5.2 KiB
Plaintext
188 lines
5.2 KiB
Plaintext
perf-record(1)
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==============
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NAME
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----
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perf-record - Run a command and record its profile into perf.data
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SYNOPSIS
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--------
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[verse]
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'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] <command>
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'perf record' [-e <EVENT> | --event=EVENT] [-l] [-a] -- <command> [<options>]
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DESCRIPTION
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-----------
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This command runs a command and gathers a performance counter profile
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from it, into perf.data - without displaying anything.
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This file can then be inspected later on, using 'perf report'.
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OPTIONS
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-------
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<command>...::
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Any command you can specify in a shell.
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-e::
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--event=::
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Select the PMU event. Selection can be:
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- a symbolic event name (use 'perf list' to list all events)
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- a raw PMU event (eventsel+umask) in the form of rNNN where NNN is a
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hexadecimal event descriptor.
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- a hardware breakpoint event in the form of '\mem:addr[:access]'
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where addr is the address in memory you want to break in.
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Access is the memory access type (read, write, execute) it can
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be passed as follows: '\mem:addr[:[r][w][x]]'.
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If you want to profile read-write accesses in 0x1000, just set
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'mem:0x1000:rw'.
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--filter=<filter>::
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Event filter.
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-a::
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--all-cpus::
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System-wide collection from all CPUs.
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-l::
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Scale counter values.
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-p::
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--pid=::
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Record events on existing process ID (comma separated list).
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-t::
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--tid=::
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Record events on existing thread ID (comma separated list).
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-u::
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--uid=::
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Record events in threads owned by uid. Name or number.
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-r::
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--realtime=::
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Collect data with this RT SCHED_FIFO priority.
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-D::
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--no-delay::
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Collect data without buffering.
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-A::
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--append::
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Append to the output file to do incremental profiling.
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-f::
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--force::
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Overwrite existing data file. (deprecated)
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-c::
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--count=::
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Event period to sample.
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-o::
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--output=::
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Output file name.
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-i::
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--no-inherit::
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Child tasks do not inherit counters.
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-F::
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--freq=::
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Profile at this frequency.
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-m::
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--mmap-pages=::
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Number of mmap data pages. Must be a power of two.
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-g::
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--call-graph::
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Do call-graph (stack chain/backtrace) recording.
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-q::
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--quiet::
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Don't print any message, useful for scripting.
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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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-s::
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--stat::
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Per thread counts.
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-d::
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--data::
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Sample addresses.
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-T::
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--timestamp::
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Sample timestamps. Use it with 'perf report -D' to see the timestamps,
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for instance.
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-n::
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--no-samples::
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Don't sample.
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-R::
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--raw-samples::
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Collect raw sample records from all opened counters (default for tracepoint counters).
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-C::
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--cpu::
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Collect samples 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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In per-thread mode with inheritance mode on (default), samples are captured only when
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the thread executes on the designated CPUs. Default is to monitor all CPUs.
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-N::
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--no-buildid-cache::
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Do not update the builid cache. This saves some overhead in situations
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where the information in the perf.data file (which includes buildids)
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is sufficient.
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-G name,...::
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--cgroup name,...::
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monitor only in the container (cgroup) called "name". This option is available only
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in per-cpu mode. The cgroup filesystem must be mounted. All threads belonging to
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container "name" are monitored when they run on the monitored CPUs. Multiple cgroups
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can be provided. Each cgroup is applied to the corresponding event, i.e., first cgroup
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to first event, second cgroup to second event and so on. It is possible to provide
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an empty cgroup (monitor all the time) using, e.g., -G foo,,bar. Cgroups must have
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corresponding events, i.e., they always refer to events defined earlier on the command
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line.
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-b::
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--branch-any::
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Enable taken branch stack sampling. Any type of taken branch may be sampled.
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This is a shortcut for --branch-filter any. See --branch-filter for more infos.
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-j::
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--branch-filter::
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Enable taken branch stack sampling. Each sample captures a series of consecutive
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taken branches. The number of branches captured with each sample depends on the
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underlying hardware, the type of branches of interest, and the executed code.
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It is possible to select the types of branches captured by enabling filters. The
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following filters are defined:
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- any: any type of branches
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- any_call: any function call or system call
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- any_ret: any function return or system call return
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- ind_call: any indirect branch
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- u: only when the branch target is at the user level
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- k: only when the branch target is in the kernel
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- hv: only when the target is at the hypervisor level
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+
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The option requires at least one branch type among any, any_call, any_ret, ind_call.
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The privilege levels may be omitted, in which case, the privilege levels of the associated
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event are applied to the branch filter. Both kernel (k) and hypervisor (hv) privilege
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levels are subject to permissions. When sampling on multiple events, branch stack sampling
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is enabled for all the sampling events. The sampled branch type is the same for all events.
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The various filters must be specified as a comma separated list: --branch-filter any_ret,u,k
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Note that this feature may not be available on all processors.
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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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