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    SubjectRe: [PATCH 0/2] enable irqs when waiting for rwlocks
    On Wed, Oct 22, 2008 at 10:31:53AM -0700, Rick Jones wrote:
    > Petr Tesarik wrote:
    >> Hello,
    >>
    >> SGI has observed that on large systems, interrupts are not serviced for
    >> a long period of time when waiting for a rwlock. The following patch
    >> series re-enables irqs while waiting for the lock, resembling the code
    >> which is already there for spinlocks.
    >
    > Perhaps I'm just out in left field, but that (and the similar behaviour
    > for obtaining a spinlock?) feels like treating a symptom rather than a
    > root cause where the root cause would appear to be long lock hold
    > times/contention?

    Sometimes lock contention on large systems will take a few seconds to
    pass. This is normal behavior which simply can not be eliminated. For
    those cases, we need to rely upon being able to re-enable interrupts and
    allowing other operations to continue normally. Simply put, in some
    cases, nothing more can be done.

    Thanks,
    Robin


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