On 6/18/07, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote:
Slab defragmentation occurs either
1. Unconditionally when kmem_cache_shrink is called on slab by the kernel
calling kmem_cache_shrink or slabinfo triggering slab shrinking. This
form performs defragmentation on all nodes of a NUMA system.
2. Conditionally when kmem_cache_defrag(<percentage>, <node>) is called.
The defragmentation is only performed if the fragmentation of the slab
is higher then the specified percentage. Fragmentation ratios are measured
by calculating the percentage of objects in use compared to the total
number of objects that the slab cache could hold.
kmem_cache_defrag takes a node parameter. This can either be -1 if
defragmentation should be performed on all nodes, or a node number.
If a node number was specified then defragmentation is only performed
on a specific node.
Hrm, isn't -1 usually 'this node' for NUMA systems? Maybe nr_node_ids
or MAX_NUMNODES should mean 'all nodes'?
Perhaps these would be served with some #defines?
#define NUMA_THISNODE_ID (-1)
#define NUMA_ALLNODES_ID (MAX_NUMNODES)
or something?
Thanks,
Nish
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