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authorNikos Nikoleris <nikos.nikoleris@arm.com>2016-09-08 12:02:47 +0100
committerNikos Nikoleris <nikos.nikoleris@arm.com>2017-12-05 11:47:01 +0000
commit2141c2904af0f72dba4f6ec19983392d53c718bd (patch)
tree78b31286cf25c2cad316b7c1c913684b0e0fa27d /site_scons
parente67c97ee4cd61dda4378f27e0baa329b020a2fee (diff)
downloadgem5-2141c2904af0f72dba4f6ec19983392d53c718bd.tar.xz
mem: Promote deferred targets only when the block is valid
When a response indicates that there are no other sharers of the block, the cache can promote its copy of the block to writable and potential service deferred targets even if the request didn't ask for a writable copy. Previously, a response would guarantee the presence of the block in the cache. A response could either be filling, upgrading or a response to an invalidation due to a pending whole line write. Responses to cache maintenance invalidations break this assumption. This change adds an extra check to make sure that the block was already valid or that the response is filling before promoting the block. Change-Id: I6839f683a05d4dad4205c23f365a925b7b05e366 Reviewed-by: Curtis Dunham <curtis.dunham@arm.com> Reviewed-by: Anouk Van Laer <anouk.vanlaer@arm.com> Reviewed-on: https://gem5-review.googlesource.com/5048 Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com> Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
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