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SubjectRe: [PATCH] Yielding processor resources during lock contention
Zwane Mwaikambo <> wrote:
> The following patch introduces cpu_lock_yield which allows architectures
> to possibly yield processor resources during lock contention.

err.. Haven't you just invented a really sucky semaphore?

> The original
> requirement stems from Paul's requirement on PPC64 LPAR systems to yield
> the processor to the hypervisor instead of spinning.

Maybe Paul needs to use a semaphore.

Now, maybe Paul has tied himself into sufficiently tangly locking knots
that in some circumstances he needs to spin on the lock and cannot schedule
away. But he can still use a semaphore and spin on down_trylock.

Confused by all of this.
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