I know that most modern processors maintain a branch prediction table (BPT). I have read the gdb documentation but I could not found any command that should give desired results. Based on this, I have a couple questions:

Is there a gdb command (or some other way) to get the BPT info of a process?

If not, is it possible to view a process's BPT?

CodePudding user response：

is it possible to view a process's BPT?

No: at least on Intel processors it's hidden inside the processor itself and not exposed to either userspace or kernel in any way. Nor is it even documented, and constitutes "secret sauce".

You can glean some details about branch predictor by conducting careful experiments and observing various performance counters, but you can't examine it directly.