102 lines
2.6 KiB
Plaintext
102 lines
2.6 KiB
Plaintext
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perf-mem(1)
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===========
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NAME
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----
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perf-mem - Profile memory accesses
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SYNOPSIS
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--------
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[verse]
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'perf mem' [<options>] (record [<command>] | report)
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DESCRIPTION
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-----------
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"perf mem record" runs a command and gathers memory operation data
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from it, into perf.data. Perf record options are accepted and are passed through.
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"perf mem report" displays the result. It invokes perf report with the
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right set of options to display a memory access profile. By default, loads
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and stores are sampled. Use the -t option to limit to loads or stores.
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Note that on Intel systems the memory latency reported is the use-latency,
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not the pure load (or store latency). Use latency includes any pipeline
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queueing delays in addition to the memory subsystem latency.
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On Arm64 this uses SPE to sample load and store operations, therefore hardware
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and kernel support is required. See linkperf:perf-arm-spe[1] for a setup guide.
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Due to the statistical nature of SPE sampling, not every memory operation will
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be sampled.
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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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-i::
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--input=<file>::
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Input file name.
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-f::
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--force::
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Don't do ownership validation
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-t::
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--type=<type>::
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Select the memory operation type: load or store (default: load,store)
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-D::
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--dump-raw-samples::
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Dump the raw decoded samples on the screen in a format that is easy to parse with
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one sample per line.
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-x::
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--field-separator=<separator>::
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Specify the field separator used when dump raw samples (-D option). By default,
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The separator is the space character.
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-C::
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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. Default
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is to monitor all CPUS.
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-U::
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--hide-unresolved::
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Only display entries resolved to a symbol.
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-p::
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--phys-data::
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Record/Report sample physical addresses
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--data-page-size::
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Record/Report sample data address page size
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RECORD OPTIONS
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--------------
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-e::
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--event <event>::
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Event selector. Use 'perf mem record -e list' to list available events.
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-K::
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--all-kernel::
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Configure all used events to run in kernel space.
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-U::
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--all-user::
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Configure all used events to run in user space.
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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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--ldlat <n>::
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Specify desired latency for loads event. Supported on Intel and Arm64
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processors only. Ignored on other archs.
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In addition, for report all perf report options are valid, and for record
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all perf record options.
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SEE ALSO
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--------
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linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-arm-spe[1]
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