>*Hasty* look seems to suggest that keeping the fancy asm bits but compiling >with >-O2 -frename-registers makes it work equally well. > >Don't take my word for it though, double check it, it's been a long week and >brain is anything but alert at this time of the night. Yup - that makes the usermode version run just fine (no problems in the first billion lock/unlock operations ... which is quite a lot of wrap-arounds of the 15-bit ticket lock). And since we already use -frename-registers when building the kernel, no immediate help for the kernel problem. :-( I may tinker with this test a bit to include some short random amounts of hold-time for the lock, and delays between attempts to acquire it (to make it look more like a contended kernel lock and less like a continuous queue of processes trading around a lock that is never free ... Petr's debug information definitely showed the lock becoming free at the wraparound (lock == 0x0). -Tony -- To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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