mem-cache: accuracy and coverage stat for prefetchers
Add an accuracy and coverage stat for the prefetchers.
Accuracy is defined as the ratio of the number of prefetch
request that have been counted as useful over the number
of prefetch request issued.
Accuracy tells whether the prefetcher is producing useful
requests or not.
Coverage is defined as the ratio of of the number of prefetch
request that have been counted as useful over the number of
demand misses if there was no prefetch, which is counted as
the number of useful prefetch request plus the remaining
demand misses. Due to the way stats are defined in the cache,
I have to add a stat to count the number of remaining demand
misses directly in the prefetcher stat. Demand is defined
as being one of this request type: ReadReq, WriteReq,
WriteLineReq, ReadExReq, ReadCleanReq, ReadSharedReq.
Coverage tells what part of misses are covered by the prefetcher.
Change-Id: I3bb8838f87b42665fdd782889f6ba56ca2a802fc
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/47603
Reviewed-by: Daniel Carvalho <odanrc@yahoo.com.br>
Maintainer: Daniel Carvalho <odanrc@yahoo.com.br>
Tested-by: kokoro <noreply+kokoro@google.com>
4 files changed
