perf-kmem(1) — Linux manual page

PERF-KMEM(1)                   perf Manual                  PERF-KMEM(1)

NAME

       perf-kmem - Tool to trace/measure kernel memory properties

SYNOPSIS

       perf kmem [<options>] {record|stat}

DESCRIPTION

       There are two variants of perf kmem:

           'perf kmem [<options>] record [<perf-record-options>] <command>' to
           record the kmem events of an arbitrary workload. Additional 'perf
           record' options may be specified after record, such as '-o' to
           change the output file name.

           'perf kmem [<options>] stat' to report kernel memory statistics.

OPTIONS

       -i <file>, --input=<file>
           For stat, select the input file (default: perf.data unless
           stdin is a fifo)

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

       -v, --verbose
           Be more verbose. (show symbol address, etc)

       --caller
           Show per-callsite statistics

       --alloc
           Show per-allocation statistics

       -s <key[,key2...]>, --sort=<key[,key2...]>
           Sort the output (default: frag,hit,bytes for slab and
           bytes,hit for page). Available sort keys are ptr, callsite,
           bytes, hit, pingpong, frag for slab and page, callsite,
           bytes, hit, order, migtype, gfp for page. This option should
           be preceded by one of the mode selection options - i.e.
           --slab, --page, --alloc and/or --caller.

       -l <num>, --line=<num>
           Print n lines only

       --raw-ip
           Print raw ip instead of symbol

       --slab
           Analyze SLAB allocator events.

       --page
           Analyze page allocator events

       --live
           Show live page stat. The perf kmem shows total allocation
           stat by default, but this option shows live (currently
           allocated) pages instead. (This option works with --page
           option only)

       --time=<start>,<stop>
           Only analyze samples within given time window:
           <start>,<stop>. Times have the format seconds.microseconds.
           If start is not given (i.e., time string is ,x.y) then
           analysis starts at the beginning of the file. If stop time is
           not given (i.e, time string is x.y,) then analysis goes to
           end of file.

SEE ALSO

       perf-record(1)

COLOPHON

       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 
       ⟨https://perf.wiki.kernel.org/index.php/Main_Page⟩.  If you have a
       bug report for this manual page, send it to
       linux-kernel@vger.kernel.org.  This page was obtained from the
       project's upstream Git repository
       ⟨http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git⟩
       on 2024-06-14.  (At that time, the date of the most recent commit
       that was found in the repository was 2024-06-13.)  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 man-pages@man7.org

perf                           2021-10-08                   PERF-KMEM(1)

Pages that refer to this page: perf(1)

---