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probe: Add probe in Fetch, IEW, Rename and Commit

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This patch adds probe points in Fetch, IEW, Rename and Commit stages as follows.

A probe point is added in the Fetch stage for probing when a fetch request is
sent. Notify is fired on the probe point when a request is sent succesfully in
the first attempt as well as on a retry attempt.

Probe points are added in the IEW stage when an instruction begins to execute
and when execution is complete. This points can be used for monitoring the
execution time of an instruction.

Probe points are added in the Rename stage to probe renaming of source and
destination registers and when there is squashing. These probe points can be
used to track register dependencies and remove when there is squashing.

A probe point for squashing is added in Commit to probe squashed instructions.
This commit is contained in:
Radhika Jagtap
2015-12-07 16:42:15 -06:00
parent bbcbe028fe
commit eb19fc2976
9 changed files with 73 additions and 1 deletions
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3
src/cpu/o3/commit_impl.hh
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@@ -173,6 +173,7 @@ DefaultCommit<Impl>::regProbePoints()
{
ppCommit = new ProbePointArg<DynInstPtr>(cpu->getProbeManager(), "Commit");
ppCommitStall = new ProbePointArg<DynInstPtr>(cpu->getProbeManager(), "CommitStall");
ppSquash = new ProbePointArg<DynInstPtr>(cpu->getProbeManager(), "Squash");
}
template <class Impl>
@@ -1010,6 +1011,8 @@ DefaultCommit<Impl>::commitInsts()
rob->retireHead(commit_thread);
++commitSquashedInsts;
// Notify potential listeners that this instruction is squashed
ppSquash->notify(head_inst);
// Record that the number of ROB entries has changed.
changedROBNumEntries[tid] = true;