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    SubjectRe: [PATCH 5/5] workqueue: retry on NUMA_NO_NODE when create_worker() fails
    On Fri, Dec 12, 2014 at 5:19 AM, Lai Jiangshan <laijs@cn.fujitsu.com> wrote:
    > A pwq bound to a specified node might be last long or even forever after
    > the node was offline. Especially when this pwq has some back-to-back work
    > items which requeue themselves and cause the pwq can't quit.
    >
    > This kinds of pwqs will cause their own pools busy and maybe create workers.
    > This pools will fail on create_worker() since the node is offline.
    >
    > This case is extremely rare, but it is possible. And we hope create_worker()
    > to be fault-tolerant in this case and other different cases when the node
    > is lack of memory, for example, create_worker() can try to allocate memory
    > from the whole system rather than only the target node, the most important
    > thing is making some progress.
    >
    > So the solution is that, when the create_worker() fails on a specified node,
    > it will retry with NUMA_NO_NODE for further allocation.

    The code looks correct. But I don't think this issue depend on node offlining.
    The allocation may also fail if node has no memory.


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