Dear Andreas,
Thanks for your reply, If i want to implement
exclusive or non exclusive cache (As cache implemented by gem5 is not
perfectly exclusive), do i need to check these commands.
Many Thanks
Best Regards
Avais
On Fri, Aug 4, 2017 at 4:29 PM, Andreas Hansson <andreas.hans...@arm.com>
wrote:
> Hi,
>
> As the comment says:
>
> In the case of a mostly exclusive cache, we allocate on fill *if the
> packet did not come from a cache*, thus if we are dealing with a
> whole-line write (the latter behaves much like a writeback), the original
> target packet came from a non-caching source, or if we are performing a
> prefetch or LLSC.
>
> Andreas
>
> From: gem5-users <gem5-users-boun...@gem5.org> on behalf of Muhammad
> Avais <avais.suh...@gmail.com>
> Reply-To: gem5 users mailing list <gem5-users@gem5.org>
> Date: Friday, 4 August 2017 at 03:31
> To: gem5 users mailing list <gem5-users@gem5.org>
> Subject: [gem5-users] allocOnFill() function in cache.hh
>
> Hi,
>
> There is alloconfill() function in gem5. This determines whether data is
> allocated in cache upon miss in L1 cache or not.
>
> Ideally, If cache is mostly exclusive then data should not be allocated in
> cache upon miss in L1 cache.
>
> But this function loads data in 'mostly exclusive' upon miss in L1 cache
> in some cases( if commands are WriteLineReq, ReadReq and WriteReq).
>
> Can anyone explain, why this function checks commands(WriteLineReq, ReadReq
> and WriteReq) in order to fill data in mostly exclusive cache
>
> https://github.com/gem5/gem5/blob/master/src/mem/cache/cache.hh
> /**
> * Determine whether we should allocate on a fill or not. If this
> * cache is mostly inclusive with regards to the upstream cache(s)
> * we always allocate (for any non-forwarded and cacheable
> * requests). In the case of a mostly exclusive cache, we allocate
> * on fill if the packet did not come from a cache, thus if we:
> * are dealing with a whole-line write (the latter behaves much
> * like a writeback), the original target packet came from a
> * non-caching source, or if we are performing a prefetch or LLSC.
> *
> * @param cmd Command of the incoming requesting packet
> * @return Whether we should allocate on the fill
> */
> inline bool allocOnFill(MemCmd cmd) const override
> {
> return clusivity == Enums::mostly_incl ||
> cmd == MemCmd::WriteLineReq ||
> cmd == MemCmd::ReadReq ||
> cmd == MemCmd::WriteReq ||
> cmd.isPrefetch() ||
> cmd.isLLSC();
> }
>
>
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