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2016 Jun 06
2
[PATCH v5 1/6] qspinlock: powerpc support qspinlock
On Fri, Jun 03, 2016 at 02:33:47PM +1000, Benjamin Herrenschmidt wrote:
> ?- For the above, can you show (or describe) where the qspinlock
> ? ?improves things compared to our current locks.
So currently PPC has a fairly straight forward test-and-set spinlock
IIRC. You have this because LPAR/virt muck and lock holder preemption
issues etc..
qspinlock is 1) a fair lock (like ticket locks)
2016 Jun 06
2
[PATCH v5 1/6] qspinlock: powerpc support qspinlock
On Fri, Jun 03, 2016 at 02:33:47PM +1000, Benjamin Herrenschmidt wrote:
> ?- For the above, can you show (or describe) where the qspinlock
> ? ?improves things compared to our current locks.
So currently PPC has a fairly straight forward test-and-set spinlock
IIRC. You have this because LPAR/virt muck and lock holder preemption
issues etc..
qspinlock is 1) a fair lock (like ticket locks)