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slabinfo



SYNOPSIS

       cat /proc/slabinfo


DESCRIPTION

       Frequently used objects in the Linux kernel (buffer heads,
       inodes, dentries, 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 cur­
       rently 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 over­
       head,  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
       "(statistics)" 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 synchroniza­
       tion  when  allocating objects from the cache).  The first
       column is the per-CPU limit: the maximum number of objects
       flushing objects to the global cache.

       It  is  possible  to tune the SMP per-CPU slab cache limit
       and batchcount via:

       echo "cache_name limit batchcount" > /proc/slabinfo


AVAILABILITY

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


FILES

       <linux/slab.h>

                            2001-06-19                SLABINFO(5)
  
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