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
Normal invocation of slabtop does not require any options. The
behavior, however, can be fine-tuned by specifying one or more of the
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.
Display the output once and then exit.
Display version information and exit.
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
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
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.
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
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
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COLOPHON (which is not part of the original manual page), send a mail
procps-ng June 2011 SLABTOP(1)