Re: [RFC PATCH] perf/kvm: Guest Symbol Resolution for powerpc

On 6/16/15 7:24 PM, Hemant Kumar wrote:

Because, this depends on the kernel tracepoint "kvm_hv:kvm_guest_exit".
perf_prepare_sample() in the kernel side sets the event->header.misc
field to
PERF_RECORD_MISC_KERNEL through perf_misc_flags(pt_regs). In case of
tracepoints which always get hit in the host kernel context, the
perf_misc_flags() will always return PERF_RECORD_MISC_KERNEL.

IMHO we will rather have to set the cpumode in the user space for this
tracepoint
and we can't depend on the event->header.misc field for this case.

What would you suggest?

oh, right you are using a tracepoint for this. It does not have the 
hooks to specify cpumode. Never mind.