Section: User Commands (1)
Updated: June 2011
slabtop - display kernel slab cache information in real time
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
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
in seconds. By default,
refreshes the display every three seconds. To exit the program, hit
- -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.
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.
|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|
|o||number of objects||OBJS|
|p||pages per slab||N/A|
|s||object size||OBJ SIZE|
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
Refresh the screen.
Quit the program.
requires a 2.4 or later kernel (specifically, a version 1.1 or later
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.
Written by Chris Rivera and Robert Love.
was inspired by Martin Bligh's perl script,
Please send bug reports to