I'd imagine that it is all in plain text in /proc file system expised by the kernel.
- Tomas On Fri, Mar 10, 2023, 19:51 Khaled Mahmoud <[email protected]> wrote: > Hi, > > I have been trying to find an answer to this question for a long time, but > I have not found a clear answer or reference. > > *Context: *Linux perf tool, can read performance counters, either > system-wide or for specific threads/processes of interests. Performance > counters are stored in Model Specific Registers which are core registers. > > *Question*: How are tools like perf able to read the performance counters > that reside in foreign registers in foreign cores ? > > *My Understanding So Far*: Unless there is explicit support from CPU(s), > which there is nothing I am aware of, the only way to do this is through > Linux ptrace. You interrupt a process, inspect its values, and let go ? > > I asked this question in the PAPI mailing list a while ago, but I did not > get the answer I am looking for. They advised me to ask in a Linux group. > > Apologies if this is not the right group to ask the question > > > -- > Regards, > Khaled Mahmoud >
