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From: Maran P. <ma...@li...> - 2013-06-21 10:13:20
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On 06/20/2013 07:09 PM, Julian Seward wrote: > >> And doing a rollback + failure path >> is slower than doing the failure path from the beginning. So (1) may >> not be a bad option at all. > OK, worth a try. At least it gives us an ultra-simple baseline > implementation. I expect to have a Haswell box to try with, soon. > > That's Intel-specific, though. The question of whether we can fit > Power/s390 into the same framework is also important. > With s390, there are 2 modes of transaction execution. 1) Non-constrained transaction 2) Constrained transaction Constrained-transaction as stated in PoP is "a constrained transaction will eventually complete, thus an abort-handler routine is not required." (Refer to: Principles of operations: "Constrained Transaction", pg. no: 5-105) So, a failure (fallback) path need not be present for all the transactions. So, on encountering a transaction, directly jumping to fallback path may not be a viable option atleast with constrained transactions. As far as I know, constrained transaction seem to be specific to s390. (These seem to be no equivalent for this type of transaction in ppc). Even with non-constrained transaction, the s390 architecture does not enforce an abort handler to be specified for a transaction. Also, it is possible to specify a set of (general) registers to be restored to the original value on a transaction abort whereas the remaining registers will retain the value updated in the transaction. And this kind of partial register set restoration seems to be specific to s390. Similary, it is possible to do a non-transactional store within a transaction - that is, the store operation designated as non-transactional store will be retained on a transaction abort while all the other data stores within a transaction are discarded. This feature also seems to be specific to s390. --Maran |