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NAME | SYNOPSIS | DESCRIPTION | OPTIONS | SORT CRITERIA | COMMANDS | FILES | SEE ALSO | NOTES | AUTHORS | REPORTING BUGS | COLOPHON |
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SLABTOP(1) General Commands Manual SLABTOP(1)
slabtop - display kernel slab cache information in real time
slabtop [option ...]
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.
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.
--human
Show slab sizes automatically scaled to shortest three
digit unit and display the units of print out. Following
units are used.
B = bytes
Ki = kibibyte
Mi = mebibyte
Gi = gibibyte
Ti = tebibyte
Pi = pebibyte
If this flag is not used, the slab sizes will be shown in KiB.
-V, --version
Display version information and exit.
-h, --help
Display usage information and exit.
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
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.
<SPACEBAR>
Refresh the screen.
Q Quit the program.
/proc/slabinfo
slab information
free(1), ps(1), top(1), vmstat(8)
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.
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.
Written by Chris Rivera and Robert Love.
slabtop was inspired by Martin Bligh's perl script, vmtop.
Please send bug reports to ⟨procps@freelists.org⟩.
This page is part of the procps-ng (/proc filesystem utilities)
project. Information about the project can be found at
⟨https://gitlab.com/procps-ng/procps⟩. If you have a bug report
for this manual page, see
⟨https://gitlab.com/procps-ng/procps/blob/master/Documentation/bugs.md⟩.
This page was obtained from the project's upstream Git repository
⟨https://gitlab.com/procps-ng/procps.git⟩ on 2025-08-11. (At that
time, the date of the most recent commit that was found in the
repository was 2025-07-30.) 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
procps-ng 2023-12-26 SLABTOP(1)
Pages that refer to this page: free(1), top(1), slabinfo(5)
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HTML rendering created 2025-09-06 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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