Hi, I'm writing a Linux kernel module that uses debug-register to sample Linux kernel using perf interface "register_wide_hw_breakpoint". I am interested to get the "callchain" of the process context at the sample handler. For this I have set PERF_SAMPLE_CALLCHAIN as a sample type.
One issue is that the associated instruction pointer(IP) and callchain(perf_callchain) of the samples belongs to nmi context rather than process context. How can I collect the information associated with process context rather than nmi context? Previously, I have done sampling from user-space which gave me correct callchain. But I cannot make it work from kernel space. Any help would be appreciated. Regards, Probir
