Manual: slabtop

SLABTOP(1)						User Commands						  SLABTOP(1)

NAME
       slabtop - display kernel slab cache information in real time

SYNOPSIS
       slabtop [options]

DESCRIPTION
       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
       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.	This cannot be combined with the -o option.

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

       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
       /proc/slabinfo
	      slab information

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

NOTES
       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 mem‐
       ory.  The 'Slab' field in the /proc/meminfo file is tracking information about used slab physical memory.

       The CACHE SIZE column is not accurate, it's the upper limit of memory used by specific slab. When system	 using	slub
       (most common case) is under high memory pressure, there are slab order fallbacks, which means "pages per slab" is not
       constant and may decrease.

AUTHORS
       Written by Chris Rivera and Robert Love.

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

REPORTING BUGS
       Please send bug reports to procps@freelists.org

procps-ng						 2021-03-11						  SLABTOP(1)