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.

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 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. (x86 only)

       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)

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
       2020-06-09.  (At that time, the date of the most recent commit that
       was found in the repository was 2020-06-08.)  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                             2019-02-04                      PERF-MEM(1)

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