perf-kmem(1) — Linux manual page


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

NAME         top

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

SYNOPSIS         top

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

DESCRIPTION         top

       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         top

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

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

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

           Show per-callsite statistics

           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

           Print raw ip instead of symbol

           Analyze SLAB allocator events.

           Analyze page allocator events

           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)

           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         top


COLOPHON         top

       This page is part of the perf (Performance analysis tools for
       Linux (in Linux source tree)) project.  Information about the
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perf                           2021-10-08                   PERF-KMEM(1)

Pages that refer to this page: perf(1)