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    SubjectRe: [patch 00/41] cpu alloc / cpu ops v3: Optimize per cpu access
    Christoph Lameter wrote:
    > On Thu, 29 May 2008, Andrew Morton wrote:
    ...
    >> Plus who knows what lies ahead of us?
    >
    > Well invariably we will end up with cpu area defragmentation.... Sigh.
    >
    >> I don't think there is presently any upper limit on alloc_percpu()? It
    >> uses kmalloc() and kmalloc_node()?
    >>
    >> Even if there is some limit, is it an unfixable one?
    >
    > No there is no limit. It just wastes lots of space (pointer arrays,
    > alignment etc) that we could use to configure sufficiently large per cpu
    > areas.

    Is there any reason why the per_cpu area couldn't be made extensible? Maybe
    a simple linked list of available areas? (And use a config variable and/or
    boot param for initial size and increment size?) [Ignoring the problem of
    reclaiming the space...]


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