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    SubjectRe: [PATCH] Convert powerpc simple spinlocks into ticket locks
    On Thu, Feb 06, 2014 at 02:19:52PM -0600, Scott Wood wrote:
    > On Thu, 2014-02-06 at 18:37 +0100, Torsten Duwe wrote:
    > > On Thu, Feb 06, 2014 at 05:38:37PM +0100, Peter Zijlstra wrote:
    >
    > > > Can you pair lwarx with sthcx ? I couldn't immediately find the answer
    > > > in the PowerISA doc. If so I think you can do better by being able to
    > > > atomically load both tickets but only storing the head without affecting
    > > > the tail.

    Can I simply write the half word, without a reservation, or will the HW caches
    mess up the other half? Will it ruin the cache coherency on some (sub)architectures?

    > Plus, sthcx doesn't exist on all PPC chips.

    Which ones are lacking it? Do all have at least a simple 16-bit store?

    Torsten



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