Re: [PATCH v5 2/5] perf: Add SNOOP_PEER flag to perf mem data struct

[Liang, Kan]

On 4/22/2022 2:49 PM, Ali Saidi wrote:
> On Wed, 20 Apr 2022 18:43:28, Kan Liang wrote:
> > On 4/8/2022 3:53 PM, Ali Saidi wrote:
> > > Add a flag to the perf mem data struct to signal that a request caused a
> > > cache-to-cache transfer of a line from a peer of the requestor and
> > > wasn't sourced from a lower cache level.
> >
> > It sounds similar to the Forward state. Why can't the
> > PERF_MEM_SNOOPX_FWD be reused?
>
> Is there a definition of SNOOPX_FWD i can refer to? Happy to use this instead if
> the semantics align between architectures.

+ Andi

As my understanding, the SNOOPX_FWD means the Forward state, which is a 
non-modified (clean) cache-to-cache copy.
https://en.wikipedia.org/wiki/MESIF_protocol

Thanks,
Kan