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    SubjectRe: [PATCH] mm: remove global locks from mm/highmem.c
    Andrew Morton wrote:
    > On Mon, 29 Jan 2007 17:31:20 -0800
    > "Martin J. Bligh" <mbligh@mbligh.org> wrote:
    >
    >> Peter Zijlstra wrote:
    >>> On Sun, 2007-01-28 at 14:29 -0800, Andrew Morton wrote:
    >>>
    >>>> As Christoph says, it's very much preferred that code be migrated over to
    >>>> kmap_atomic(). Partly because kmap() is deadlockable in situations where a
    >>>> large number of threads are trying to take two kmaps at the same time and
    >>>> we run out. This happened in the past, but incidences have gone away,
    >>>> probably because of kmap->kmap_atomic conversions.
    >>>> From which callsite have you measured problems?
    >>> CONFIG_HIGHPTE code in -rt was horrid. I'll do some measurements on
    >>> mainline.
    >>>
    >> CONFIG_HIGHPTE is always horrid -we've known that for years.
    >
    > We have? What's wrong with it? <looks around for bug reports>

    http://www.ussg.iu.edu/hypermail/linux/kernel/0307.0/0463.html

    July 2003.


    M.
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