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Add slab usage summeries to /proc

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One of the most common things you want to know when looking at
the slab is how much memory is being used.  This information was
available in /proc/spl/kmem/slab but only on a per-slab basis.
This commit adds the following /proc/sys/kernel/spl/kmem/slab*
entries to make total slab usage easily available at a glance.

  slab_kmem_total - Total kmem slab size
  slab_kmem_avail - Alloc'd kmem slab size
  slab_kmem_max   - Max observed kmem slab size
  slab_vmem_total - Total vmem slab size
  slab_vmem_avail - Alloc'd vmem slab size
  slab_vmem_max   - Max observed vmem slab size

NOTE: The slab_*_max values are expected to over report because
they show maximum values since boot, not current values.
This commit is contained in:
Brian Behlendorf
2011-03-26 00:03:32 -07:00
parent d0a1038ff3
commit 3336e29cc2
2 changed files with 125 additions and 1 deletions
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include/sys/kmem.h
+6
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@@ -293,6 +293,9 @@ enum {
KMC_BIT_OFFSLAB = 7, /* Objects not on slab */
KMC_BIT_REAPING = 16, /* Reaping in progress */
KMC_BIT_DESTROY = 17, /* Destroy in progress */
KMC_BIT_TOTAL = 18, /* Proc handler helper bit */
KMC_BIT_ALLOC = 19, /* Proc handler helper bit */
KMC_BIT_MAX = 20, /* Proc handler helper bit */
};
/* kmem move callback return values */
@@ -314,6 +317,9 @@ typedef enum kmem_cbrc {
#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
#define KMC_REAPING (1 << KMC_BIT_REAPING)
#define KMC_DESTROY (1 << KMC_BIT_DESTROY)
#define KMC_TOTAL (1 << KMC_BIT_TOTAL)
#define KMC_ALLOC (1 << KMC_BIT_ALLOC)
#define KMC_MAX (1 << KMC_BIT_MAX)
#define KMC_REAP_CHUNK INT_MAX
#define KMC_DEFAULT_SEEKS 1