Hi, I am patching the perf tool of linux to set HW breakpoints at kernel space. I found that there is an interface for user-space (modify_user_hw_breakpoint) but no interface for system wide breakpoint modification. Older version of linux had this support by K. Prasad. I was wondering why linux remove this support. Moreover, when I patch the perf tool for kernel space breakpoint following steps from "modify_user_hw_breakpoint", kernel panics but nothing is written on log file. What could be the issue? Is it a race condition while modifying the address or is it because kernel restricts it to set HW breakpoint at some kernel address(if so, where is it written)?
Regards -- Probir Roy
