公开(公告)号：US09817760B2

公开(公告)日：2017-11-14

申请号：US15063259

申请日：2016-03-07

Applicant: QUALCOMM Incorporated

Inventor： Eric Francis Robinson ,  Khary Jason Alexander ,  Zeid Hartuon Samoail ,  Benjamin Charles Michelson

IPC: G06F12/08 ,  G06F12/0815 ,  G06F12/0811 ,  G06F12/084 ,  G06F12/0831

CPC classification number: G06F12/0815 ,  G06F12/0811 ,  G06F12/0831 ,  G06F12/084 ,  G06F2212/1024 ,  G06F2212/251 ,  G06F2212/621

Abstract: The disclosure relates to filtering snoops in coherent multiprocessor systems. For example, in response to a request to update a target memory location at a Level-2 (L2) cache shared among multiple local processing units each having a Level-1 (L1) cache, a lookup based on the target memory location may be performed in a snoop filter that tracks entries in the L1 caches. If the lookup misses the snoop filter and the snoop filter lacks space to store a new entry, a victim entry to evict from the snoop filter may be selected and a request to invalidate every cache line that maps to the victim entry may be sent to at least one of the processing units with one or more cache lines that map to the victim entry. The victim entry may then be replaced in the snoop filter with the new entry corresponding to the target memory location.