[PATCH v3 11/11] powerpc: rewrite local_t using soft_irq

Benjamin Herrenschmidt benh at kernel.crashing.org
Tue Nov 15 20:35:44 AEDT 2016


On Tue, 2016-11-15 at 09:06 +0100, Gabriel Paubert wrote:
> 
> I'm really wondering whether this is the kind of thing that would
> benefit from transactions. But transactional memory was only implemented
> on Power7 and later IIRC, and we still need to support machines without
> transactional memory. 

Power8 and later.

Also this is about *local* atomics not general atomics, so the overhead
of starting a transaction in that case is way way higher than the
proposed implementation.

Cheers,
Ben.



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