US 12,423,100 B1
Prefetch pattern selection
Scott Courtland Hadley, Austin, TX (US); and Devin S. Lafford, Austin, TX (US)
Assigned to Arm Limited, Cambridge (GB)
Filed by Arm Limited, Cambridge (GB)
Filed on Mar. 19, 2024, as Appl. No. 18/609,454.
Int. Cl. G06F 9/30 (2018.01); G06F 9/32 (2018.01); G06F 9/38 (2018.01)
CPC G06F 9/30047 (2013.01) [G06F 9/321 (2013.01); G06F 9/3802 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An apparatus comprising:
pattern storage circuitry configured to store information indicative of a plurality of prefetch patterns, each of the plurality of prefetch patterns indicating a trigger access request and comprising pattern information associated with the trigger access request, the pattern information indicative of one or more addresses to be used for generation of prefetch requests to prefetch data into local storage circuitry in advance of a demand request for the data by processing circuitry; and
control circuitry responsive to an observation of the trigger access request indicated in a prefetch pattern of the plurality of prefetch patterns to perform a determination of whether the prefetch pattern is selected for training by prefetch training circuitry,
wherein:
each of the plurality of prefetch patterns comprises back-off information indicating a back-off period during which the prefetch pattern is to be overlooked for the training; and
the control circuitry is responsive to the prefetch pattern being selected for the training to update the back-off information.