Messages in this thread | | | Date | Tue, 26 Jun 2007 12:13:57 -0700 | From | "Nish Aravamudan" <> | Subject | Re: [patch 12/26] SLUB: Slab defragmentation core |
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On 6/18/07, clameter@sgi.com <clameter@sgi.com> 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?
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