slabtop(1) - phpMan
SLABTOP(1) User Commands SLABTOP(1)
slabtop - display kernel slab cache information in real time
slabtop displays detailed kernel slab cache information in real time. It displays a list‐
ing of the top caches sorted by one of the listed sort criteria. It also displays a sta‐
tistics 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:
Refresh the display every n in seconds. By default, slabtop refreshes the display
every three seconds. To exit the program, hit q.
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 objects ("o").
The sort criteria can also be changed while slabtop is running by pressing the associated
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.
Refresh the screen.
Q Quit the program.
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 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.
slabtop was inspired by Martin Bligh's perl script, vmtop.
Please send bug reports to ⟨procps AT freelists.org⟩
procps-ng June 2011 SLABTOP(1)