slabtop(1) — Linux manual page


SLABTOP(1)                      User Commands                     SLABTOP(1)

NAME         top

       slabtop - display kernel slab cache information in real time

SYNOPSIS         top

       slabtop [options]

DESCRIPTION         top

       slabtop displays detailed kernel slab cache information in real time.
       It displays a listing of the top caches sorted by one of the listed
       sort criteria.  It also displays a statistics header filled with slab
       layer information.

OPTIONS         top

       Normal invocation of slabtop does not require any options.  The
       behavior, however, can be fine-tuned by specifying one or more of the
       following flags:

       -d, --delay=N
              Refresh the display every n in seconds.  By default, slabtop
              refreshes the display every three seconds.  To exit the
              program, hit q.

       -s, --sort=S
              Sort by S, where S is one of the sort criteria.

       -o, --once
              Display the output once and then exit.

       -V, --version
              Display version information and exit.

       -h, --help
              Display usage information and exit.

SORT CRITERIA         top

       The following are valid sort criteria used to sort the individual
       slab caches and thereby determine what are the "top" slab caches to
       display.  The default sort criteria is to sort by the number of
       objects ("o").

       The sort criteria can also be changed while slabtop is running by
       pressing the associated character.

       character   description                header
       a           number of active objects   ACTIVE
       b           objects per slab           OBJ/SLAB
       c           cache size                 CACHE SIZE
       l           number of slabs            SLABS
       v           number of active slabs     N/A
       n           name                       NAME
       o           number of objects          OBJS
       p           pages per slab             N/A
       s           object size                OBJ SIZE
       u           cache utilization          USE

COMMANDS         top

       slabtop accepts keyboard commands from the user during use.  The
       following are supported.  In the case of letters, both cases are

       Each of the valid sort characters are also accepted, to change the
       sort routine. See the section SORT CRITERIA.

              Refresh the screen.

       Q      Quit the program.

FILES         top

              slab information

SEE ALSO         top

       free(1), ps(1), top(1), vmstat(8)

NOTES         top

       Currently, slabtop requires a 2.4 or later kernel (specifically, a
       version 1.1 or later /proc/slabinfo).  Kernel 2.2 should be supported
       in the future.

       The slabtop statistic header is tracking how many bytes of slabs are
       being used and is not a measure of physical memory.  The 'Slab' field
       in the /proc/meminfo file is tracking information about used slab
       physical memory.

AUTHORS         top

       Written by Chris Rivera and Robert Love.

       slabtop was inspired by Martin Bligh's perl script, vmtop.

REPORTING BUGS         top

       Please send bug reports to ⟨⟩

COLOPHON         top

       This page is part of the procps-ng (/proc filesystem utilities)
       project.  Information about the project can be found at 
       ⟨⟩.  If you have a bug report for
       this manual page, see
       This page was obtained from the project's upstream Git repository
       ⟨⟩ on 2020-09-18.  (At that
       time, the date of the most recent commit that was found in the repos‐
       itory was 2020-09-16.)  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

procps-ng                         June 2011                       SLABTOP(1)

Pages that refer to this page: free(1)top(1)slabinfo(5)