On 2012-09-01 12:22, Chris Wilson wrote: > On Sat, 01 Sep 2012 11:35:13 -0700, Ben Widawsky <ben at bwidawsk.net> > wrote: >> I have no problem with Daniel's patch. It's just a matter of cutting >> through some scheduler BS of "when the GPU wants to change >> frequency" >> vs. "when we actually change the GPU frequency." I think *both* are >> interesting. > > We already trace the interrupt, which has been invaluable in > debugging. And there is no other source currently... :) > -Chris No we do not trace it (/me is looking on cgit, so perhaps a bit error prone). Sure we trace GT interrupts, but not pm interrupts (again, unless I am missing something via code browsing on the web). Furthermore, even if we have added a generic interrupt trace event and I've missed it: I think it's still nice to have a power/performance specific one for users like powerTOP, as opposed to driver developers. -- Ben Widawsky, Intel Open Source Technology Center