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
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
- -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
||number of active objects
||objects per slab
||number of slabs
||number of active slabs
||number of objects
||pages per slab
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.
- Quit the program.
- slab information
requires a 2.4 or later kernel (specifically, a
version 1.1 or later /proc/slabinfo
). Kernel 2.2 should be supported in
The slabtop statistic header is tracking how many bytes of slabs are being used
and it 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, vmtop
Please send bug reports to