NAME

       perf-mem - Profile memory accesses

SYNOPSIS

       perf mem [<options>] (record [<command>] | report)

DESCRIPTION

       "perf mem record" runs a command and gathers memory operation data from it, into
       perf.data. Perf record options are accepted and are passed through.

       "perf mem report" displays the result. It invokes perf report with the right set of
       options to display a memory access profile. By default, loads and stores are sampled. Use
       the -t option to limit to loads or stores.

       Note that on Intel systems the memory latency reported is the use-latency, not the pure
       load (or store latency). Use latency includes any pipeline queueing delays in addition to
       the memory subsystem latency.

       On Arm64 this uses SPE to sample load and store operations, therefore hardware and kernel
       support is required. See perf-arm-spe(1) for a setup guide. Due to the statistical nature
       of SPE sampling, not every memory operation will be sampled.

OPTIONS

       <command>...
           Any command you can specify in a shell.

       -i, --input=<file>
           Input file name.

       -f, --force
           Don’t do ownership validation

       -t, --type=<type>
           Select the memory operation type: load or store (default: load,store)

       -D, --dump-raw-samples
           Dump the raw decoded samples on the screen in a format that is easy to parse with one
           sample per line.

       -x, --field-separator=<separator>
           Specify the field separator used when dump raw samples (-D option). By default, The
           separator is the space character.

       -C, --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.

       -U, --hide-unresolved
           Only display entries resolved to a symbol.

       -p, --phys-data
           Record/Report sample physical addresses

       --data-page-size
           Record/Report sample data address page size

RECORD OPTIONS

       -e, --event <event>
           Event selector. Use perf mem record -e list to list available events.

       -K, --all-kernel
           Configure all used events to run in kernel space.

       -U, --all-user
           Configure all used events to run in user space.

       -v, --verbose
           Be more verbose (show counter open errors, etc)

       --ldlat <n>
           Specify desired latency for loads event. Supported on Intel and Arm64 processors only.
           Ignored on other archs.

       In addition, for report all perf report options are valid, and for record all perf record
       options.

SEE ALSO

       perf-record(1), perf-report(1), perf-arm-spe(1)