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    SubjectRe: [PATCH 0/3] ARM 4Kstacks: introduction
    Ming Lei <> writes:

    > On Wed, Oct 19, 2011 at 6:51 PM, Arnd Bergmann <> wrote:
    >> On Tuesday 18 October 2011 17:26:44 Tim Bird wrote:
    >>> Even inside Sony, usage of 4K stacks is limited
    >>> to some very special cases, where memory is exceedingly
    >>> tight (we have one system with 4M of RAM).  And we
    >>> don't mind lopping off features or coding around
    >>> problem areas to support our special case.
    >> I would imagine that in those cases, you can gain more by reducing the
    >> number of threads in the system. What is the highest number of
    >> concurrent threads that you expect in a limited use case with no
    >> networking or block devices?
    > If system run for some time, sometimes it may be difficult for
    > memory allocator to allocate 2 continuous page frames even there are
    > many spare page frames in system because of
    > fragment issue, so the patch does make sense. Anyway,
    > it provides one option for user to apply 4k stack to avoid
    > such kind of process creation failure.

    Can't page migration be used in these situations?

    Måns Rullgård
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