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perry |
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SLABINFO |
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!!!SLABINFO |
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NAME |
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SYNOPSIS |
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DESCRIPTION |
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AVAILABILITY |
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FILES |
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---- |
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!!NAME |
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/proc/slabinfo - Kernel slab allocator statistics |
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!!SYNOPSIS |
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__cat /proc/slabinfo__ |
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!!DESCRIPTION |
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Frequently used objects in the Linux kernel (buffer heads, |
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inodes, dentries, etc) have their own cache. The file |
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''/proc/slabinfo'' gives statistics. For |
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example |
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% cat /proc/slabinfo |
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slabinfo - version: 1.1 |
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kmem_cache 60 78 100 2 2 1 |
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blkdev_requests 5120 5120 96 128 128 1 |
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mnt_cache 20 40 96 1 1 1 |
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inode_cache 7005 14792 480 1598 1849 1 |
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dentry_cache 5469 5880 128 183 196 1 |
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filp 726 760 96 19 19 1 |
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buffer_head 67131 71240 96 1776 1781 1 |
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vm_area_struct 1204 1652 64 23 28 1 |
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... |
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size-8192 1 17 8192 1 17 2 |
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size-4096 41 73 4096 41 73 1 |
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... |
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For each slab cache the cache name, the number of currently |
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active objects, the total number of available objects, the |
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size of each object in bytes, the number of pages with at |
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least one active object, the total number of allocated |
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pages, and the number of pages per slab are |
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given. |
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Note that because of object alignment and slab cache |
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overhead, objects are not normally packed tightly into |
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pages. Pages with even one in-use object are considered |
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in-use and cannot be freed. |
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Kernels compiled with slab cache statistics will also have |
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SMP systems will also have |
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If both slab cache statistics and SMP are defined, there |
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will be four additional columns, reporting the per-CPU cache |
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statistics. The first two are the per-CPU cache allocation |
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hit and miss counts: the number of times an object was or |
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was not available in the per-CPU cache for allocation. The |
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next two are the per-CPU cache free hit and miss counts: the |
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number of times a freed object could or could not fit within |
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the per-CPU cache limit, before flushing objects to the |
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global cache. |
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It is possible to tune the SMP per-CPU slab cache limit and |
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batchcount via: |
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echo cache_name limit batchcount'' |
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'' |
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!!AVAILABILITY |
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''/proc/slabinfo'' exists since Linux 2.1.23. SMP per-CPU |
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caches exist since Linux 2.4.0-test3. |
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!!FILES |
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'''' |
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---- |
