Hello,
A ReplaceableEntry
(src/mem/cache/replacement_policies/replaceable_entry.hh) represents an
entry of the cache and contains ReplacementData that you have to derive
to adapt it to your replacement policy (add a RRPV for example).
You have to derive BaseReplacementPolicy from
src/mem/cache/replacement_policies/base.hh:
invalidate(): invalidate an entry, for DRRIP you need to set your RRPV
to an invalid distance.
touch(): update your replacement data when accessing this entry.
reset(): when a new block is set to this entry, set the initial
replacement data here.
getVictim() chose the ReplaceableEntry (cahce line) to evict.
See src/mem/cache/replacement_policies/base.hh for the base class of
replacement policies and a better descriptions of the methods and see
src/mem/cache/replacement_policies/lru_rp.cc/.hh for an example of
simple replacement policy (LRU).
I see two ways of implementing DRRIP:
-You can implement set duelling as a new replacement policy and call the
right replacement policies methods according to what is assigned the
entry your are accessing. BRRIP is implemented and SSRIP is a particular
case of BRRIP so you can pass them to your set duelling and call them as
you want. This is what I did some times ago because I needed to
implement DIP too.
-You can fully implement DRRIP like a totally independent replacement
policy.
Le 21/11/2020 à 03:37, John H via gem5-users a écrit :
Hello,
I am new with gem5, just getting started. I wanted to implement DRRIP
cache replacement policy. Have any one of you tried implementing this?
Any pointers on this would be helpful.
Thanks,
John
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