[bjwbell]

That's what I know too for graphics draw calls. For GPGPU there's been hard work for finer grained preemption, last I looked into it (~1yr ago) on Linux it was a work in progress to put it kindly.

If you're curious, lookup the Intel Broadwell GPU specs, there's sections devoted to the various levels of preemption. If you're really curious look up the workarounds needed for the finest grained preemption (this would be preempting a single GPGPU draw call).

Then decide enabling fine grained preemption should probably wait for Skylake, unless you took too much Adderall and no challenge sounds impossible. Do I speak from personal experience? I plead the fifth.

I've no experience with how fine grained nvidia's preemption is.