1. A method of utilizing indications for coalescing of outermost memory transactions, the coalescing causing committing of memory store data to memory for a first transaction to be done at transaction execution (TX) end of a second transaction, the method comprising: executing, by a processor, one or more coalescing instructions for controlling coalescing of a plurality of outermost transactions; based on the execution of the one or more coalescing instructions, determining, by the processor, whether two outermost transactions are to be coalesced; and based on determining two outermost transactions are to be coalesced, coalescing, by the processor, at least two outermost transactions included in the plurality of outermost transactions.