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    SubjectRe: [PATCH 1/5] cpuset memory spread basic implementation

    * Paul Jackson <pj@sgi.com> wrote:

    > It's job specific, and cache specific.
    >
    > If the job has a number of threads hitting the same data set and:
    > 1) the data set is faulted in non-uniformly (perhaps some
    > job init task reads it in), and
    > 2) the data set is accessed with little thread locality
    > (one thread is as likely as the next to read or write
    > a particular page),
    > then for that job spreading makes sense.
    >
    > If the cache is one that goes with a data set, such as file system
    > buffers (page cache) and inode and dentry slab caches, then for that
    > cache spreading makes sense. (Yes Andrew, your xfs query is still in
    > my queue.)
    >
    > But for many (most?) other jobs and other caches, the default
    > node-local policy is better.

    what type of objects need to be spread (currently)? It seems that your
    current focus is on filesystem related objects: pagecache, inodes,
    dentries - correct? Is there anything else that needs to be spread? In
    particular, does any userspace mapped memory need to be spread - or is
    it handled with other mechanisms?

    Ingo
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