How to count RAT stall cycles on SPR

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How to count RAT stall cycles on SPR

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Hello, I would like to count the cycles that RAT (resource allocation table) is stalled per thread and per core. On Ivy Bridge, there is an event UOPS_ISSUED.STALL_CYCLES that seems to serve the purpose per thread:

EventSel=0EH, UMask=01H, Invert=1, CMask=1

Cycles when Resource Allocation Table (RAT) does not issue Uops to Reservation Station (RS) for the thread

But there is no such an event published for SPR (perfmon/SPR at main · intel/perfmon · GitHub).

Also, how to count RAT stalls per core for SPR?

Thanks!

Hongbo

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