Re: [Gems-users] Inclusive L2 cache

[Greg Byrd <gbyrd@xxxxxxxx>]

For example, look at the in_port code for the mandatory queue in the cache.sm file.  In MOSI_SMP_bcast, you'll see comments like this when looking for a cache hit:

"We know it can't be in the L2 due to exclusion"

...Greg


Edward Lee wrote:
> I looked at the protocols page before. There is no information on SMP 
> protocols exclusivity there.
> And I know it is a coherence level issue, that's why I am trying 
> understand if there is a connection between single SLICC controller 
> usage and exclusivity. I am not a GEMS expert and just started looking 
> at the base code to be able to make some changes for a new protocol. So, 
> I am sorry if I ask any naive question here.
> So, should I check the cache.sm <http://cache.sm> and directory.sm 
> <http://directory.sm> files to get my answers for any protocol? Any 
> guidance on which specific parts of the protocol codes to look 
> especially for the MOESI_SMP_directory protocol?
> Regards,
>
> ~ Ed
>
> On Wed, May 13, 2009 at 11:58 AM, Carole-Jean Wu <carolewu@xxxxxxxxxxxxx 
> <mailto:carolewu@xxxxxxxxxxxxx>> wrote:
>     Take a look at Take a look at
>     http://www.cs.wisc.edu/gems/doc/gems-wiki/moin.cgi/Protocols
>
>     -Carole
>
>
>     On Wed, May 13, 2009 at 11:38 AM, Greg Byrd <gbyrd@xxxxxxxx
>     <mailto:gbyrd@xxxxxxxx>> wrote:
>
>         Unless things have changed, the combined L1/L2 controller use
>         exclusive
>         caches, not inclusive.
>
>         ...Greg
>
>
>         Derek Hower wrote:
>          > Inclusivity/exclusivity is a coherence-level issue.  Thus, it is
>          > determined solely by the behavior of the SLICC generated
>         protocol.  To
>          > the best of my knowledge, all released protocols in GEMS are
>         inclusive.
>          >
>          > -Derek
>          >
>          > On Wed, May 13, 2009 at 10:22 AM, Edward Lee
>         <edwl202@xxxxxxxxx <mailto:edwl202@xxxxxxxxx>
>          > <mailto:edwl202@xxxxxxxxx <mailto:edwl202@xxxxxxxxx>>> wrote:
>          >
>          >     Hi all,
>          >
>          >     I am trying to add another cache besides L1/L2 to my
>         target system
>          >     like a victim cache or an RAC. So, I am wondering how to
>         determine
>          >     exclusivity of the caches in GEMS? For example,
>          >     MOESI_SMP_directory protocol has a single SLICC
>         controller for
>          >     L1/L2, does this mean that the L2 is inclusive? Where in
>         the GEMS
>          >     code is this determied?
>          >
>          >     Thanks for any help.
>          >
>          >     Regards,
>          >
>          >     Ed
>          >
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