lkml.org 
[lkml]   [2007]   [Jun]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [patch 12/26] SLUB: Slab defragmentation core
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?

Thanks,
Nish
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-06-26 21:17    [from the cache]
©2003-2011 Jasper Spaans