Re: [Patch v5 00/19] Support SIMD/eGPRs/SSP registers sampling for perf

[Ravi Bangoria]

Hi Dapeng,

> While the hardware solution remains preferable due to its lower
> overhead and higher accuracy, this software approach provides a
> viable alternative.

Lower accuracy in the software approach is due to the delay in an NMI
delivery which will make the SIMD data misaligned a bit? Something like:

   insn1
   insn2  -> Overflow. RIP, GPRs captured by PEBS and NMI triggered
   insn3
   insn4
   insn5  -> NMI delivered here, so SIMD regs are captured here?
   insn6

Am I interpreting it correctly?

Thanks,
Ravi