perf-mem(1) — Linux manual page


PERF-MEM(1)                    perf Manual                   PERF-MEM(1)

NAME         top

       perf-mem - Profile memory accesses

SYNOPSIS         top

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

DESCRIPTION         top

       "perf mem record" runs a command and gathers memory operation
       data from it, into 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         top

           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:

       -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

           Record/Report sample data address page size

RECORD OPTIONS         top

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

       -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         top

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

COLOPHON         top

       This page is part of the perf (Performance analysis tools for
       Linux (in Linux source tree)) project.  Information about the
       project can be found at 
       ⟨⟩.  If you have a
       bug report for this manual page, send it to  This page was obtained from the
       project's upstream Git repository
       on 2023-12-22.  (At that time, the date of the most recent commit
       that was found in the repository was 2023-12-21.)  If you
       discover any rendering problems in this HTML version of the page,
       or you believe there is a better or more up-to-date source for
       the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original
       manual page), send a mail to

perf                           2023-01-27                    PERF-MEM(1)

Pages that refer to this page: perf(1)perf-c2c(1)