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    [W:0.023 / U:60.496 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site