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    SubjectRe: [patch] increase spinlock-debug looping timeouts from 1 sec to 1 min
    On Mon, 19 Jun 2006 09:02:29 +0200
    Ingo Molnar <mingo@elte.hu> wrote:

    > Subject: increase spinlock-debug looping timeouts from 1 sec to 1 min

    But it's broken. In the non-debug case we subtract RW_LOCK_BIAS so we know
    that the writer will get the lock when all readers vacate. But in the
    CONFIG_DEBUG_SPINLOCK case we don't do that, with the result that taking a
    write_lock can take over a second.

    A much, much better fix (which involves visiting all architectures) would
    be to subtract RW_LOCK_BIAS and _then_ wait for a second.

    OK, it's only debug code. But RH (for one) have decided to ship zillions
    of kernels with this debug code turned on.
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