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Commitbc2a050

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Use a non-locking initial test in TAS_SPIN on PPC.
Further testing convinces me that this is helpful at sufficiently highcontention levels, though it's still worrisome that it loses slightlyat lower contention levels.Per Manabu Ori.
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‎src/include/storage/s_lock.h

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@@ -358,6 +358,9 @@ typedef unsigned int slock_t;
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#defineTAS(lock) tas(lock)
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/* On PPC, it's a win to use a non-locking test before the lwarx */
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#defineTAS_SPIN(lock)(*(lock) ? 1 : TAS(lock))
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/*
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* NOTE: per the Enhanced PowerPC Architecture manual, v1.0 dated 7-May-2002,
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* an isync is a sufficient synchronization barrier after a lwarx/stwcx loop.

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