tree 014af6e3fa160ded0da1a8e48c696ba12fa5e181
parent 9362ead7d27f56185cf02b8bc8979171f2cf4349
author Gabe Black <gabeblack@google.com> 1506038078 -0700
committer Gabe Black <gabeblack@google.com> 1506374029 +0000

mem: Add a "map" of packet IDs to strings in probe traces.

This map is intended to map from request MasterIDs to master names. It could
be used to map to arbitrary strings in other situations, however.

The original idea to store this information was to add a new message type
which would store one ID and the string associated with it. This change stores
the IDs in the header instead so that they'll be easy to find and all
available before the packet data.

One downside of this approach is that it won't be possible to add new master
ID strings as they come up during a trace. If that becomes an issue, the two
approaches could be combined and messages could be added which would augment
the map in the header.

Also worth mentioning is that the proto2 version of the protobuf description
language does not support the "map" field type, and the protoc compiler on my
workstation doesn't support proto3. Because that's such an appropriate
representation for this data, the map is represented in an equivalent format
described in the proto3 documentation.

Change-Id: I137c8611c33d9ce6589e196d50c8638c1d88750c
Reviewed-on: https://gem5-review.googlesource.com/4782
Reviewed-by: Rahul Thakur <rjthakur@google.com>
Reviewed-by: Nikos Nikoleris <nikos.nikoleris@arm.com>
Maintainer: Nikos Nikoleris <nikos.nikoleris@arm.com>