Issue
I would like to modify an official linux kernel to test some possibilities for perf linux module (I need to modify some files in kernel/events/..., not only tools/perf/...).
Naively, I though of using a VM or Docker but I need to test my custom version with hardware performance counters (HPC); and it's a big problem :
- Docker can take HPC but I understood but only by my host kernel, I can't test directly a custom kernel without installing it on my system (correct me if I am wrong)
- The VM can't take HPC because it can't emulate it
What is the best way to test a custom kernel linux without installing directly the kernel on my ubuntu system ? And if I have to, what is the most elegant way to do these tests ? Thank you.
Solution
I found a solution : KVM + QEMU emulator.
To use PMU, I changed this parameter in the VM parameters (XML format) :
<cpu mode='host-passthrough'/>
Or you can add this option in cmd line :
-cpu host
I followed in part this page for building the kernel on qemu and for the counters this page.
Answered By - Matthmatth03 Answer Checked By - Timothy Miller (WPSolving Admin)