How to get to the shortest polling interval?

[yizhuoliang]

Hi I'm new to pcm, and I'm interested in the shortest possible polling interval for core counters like l3-cache miss.

And it seems like I need to enable PCM_NO_PERF=1, and when I just want to fetch the l3-cache alone (and do it as fast as possible), I can only run the readMSRs function, instead something like getAllCounterStates right? Thank you!