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  • LINUX man pages
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    The following form allows you to view linux man pages.

    Command:

    slabinfo

    
    
    

    SYNOPSIS

           cat /proc/slabinfo
    
    
    

    DESCRIPTION

           Frequently used objects in the Linux kernel (buffer heads, inodes, den-
           tries, etc.)  have their own  cache.   The  file  /proc/slabinfo  gives
           statistics.  For example:
    
               % cat /proc/slabinfo
               slabinfo - version: 1.1
               kmem_cache            60     78    100    2    2    1
               blkdev_requests     5120   5120     96  128  128    1
               mnt_cache             20     40     96    1    1    1
               inode_cache         7005  14792    480 1598 1849    1
               dentry_cache        5469   5880    128  183  196    1
               filp                 726    760     96   19   19    1
               buffer_head        67131  71240     96 1776 1781    1
               vm_area_struct      1204   1652     64   23   28    1
               ...
               size-8192              1     17   8192    1   17    2
               size-4096             41     73   4096   41   73    1
               ...
    
           For  each  slab  cache,  the cache name, the number of currently active
           objects, the total number of available objects, the size of each object
           in  bytes,  the  number  of  pages with at least one active object, the
           total number of allocated pages, and the number of pages per  slab  are
           given.
    
           Note  that because of object alignment and slab cache overhead, objects
           are not normally packed tightly into pages.  Pages with even one in-use
           object are considered in-use and cannot be freed.
    
           Kernels  compiled  with  slab cache statistics will also have "(statis-
           tics)" in the first line of output, and will have 5 additional columns,
           namely:  the  high  water  mark  of active objects; the number of times
           objects have been allocated; the number of times the  cache  has  grown
           (new pages added to this cache); the number of times the cache has been
           reaped (unused pages removed from this cache); and the number of  times
           there  was  an error allocating new pages to this cache.  If slab cache
           statistics are not enabled for this kernel, these columns will  not  be
           shown.
    
           SMP  systems  will  also  have "(SMP)" in the first line of output, and
           will have two additional columns for  each  slab,  reporting  the  slab
           allocation  policy  for  the  CPU-local  cache  (to reduce the need for
           inter-CPU synchronization when allocating objects from the cache).  The
           first  column  is the per-CPU limit: the maximum number of objects that
           will be cached for each CPU.  The second column is the batchcount:  the
           maximum  number of free objects in the global cache that will be trans-
           ferred to the per-CPU cache if it is empty, or the number of objects to
           be returned to the global cache if the per-CPU cache is full.
    
    
    

    FILES

           <linux/slab.h>
    
    
    

    VERSIONS

           /proc/slabinfo exists since Linux 2.1.23.   SMP  per-CPU  caches  exist
           since Linux 2.4.0-test3.
    
    
    

    NOTES

           Since  Linux 2.6.16 the file /proc/slabinfo is present only if the CON-
           FIG_SLAB kernel configuration option is enabled.
    
                                      2007-09-30                       SLABINFO(5)
    
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