I do not really understand the mentioned difficulties with instruction profiling.
Are they saying it is hard to sample the stacks across the boundary? Are they saying it is hard to do so coherently because the accelerator engine is actually asynchronous so you need to do some sort of cross-boundary correlation?
However, they then talk about file systems and /proc representations which have nothing to do with the actual sampling process; only posing problems for the display of human-readable information. Many naive profiling, tracing, and logging implementations conflate these actions to their detriment; are they being conflated here or is it just a generic statement of the scope of problems?
Are they saying it is hard to sample the stacks across the boundary? Are they saying it is hard to do so coherently because the accelerator engine is actually asynchronous so you need to do some sort of cross-boundary correlation?
However, they then talk about file systems and /proc representations which have nothing to do with the actual sampling process; only posing problems for the display of human-readable information. Many naive profiling, tracing, and logging implementations conflate these actions to their detriment; are they being conflated here or is it just a generic statement of the scope of problems?