Mechanisms for placing a processor into a gradual slow down mode of
operation are provided. The gradual slow down mode of operation comprises
a plurality of stages of slow down operation of an issue unit in a
processor in which the issuance of instructions is slowed in accordance
with a staging scheme. The gradual slow down of the processor allows the
processor to break out of livelock conditions. Moreover, since the slow
down is gradual, the processor may flexibly avoid various degrees of
livelock conditions. The mechanisms of the illustrative embodiments
impact the overall processor performance based on the severity of the
livelock condition by taking a small performance impact on less severe
livelock conditions and only increasing the processor performance impact
when the livelock condition is more severe.