Hi Vince, The aproach you are using on http://www.csl.cornell.edu/~vince/projects/qemu-trace/ to get the PC dump is similar to mine but as you dont disable the TB caches It is not a full execution trace. You only dump the PC when they are compiled and inserted on the TB cache. When qemu needs to execute the same code again, tb_find_slow() will find it was cached so your code wont dump the executed PCs again beacuse tb_gen_code() wont be called this time.
On http://www.csl.cornell.edu/~vince/projects/qemusim/ I found the same logic because you call the helper function inside of gen_intermediate_code_internal() which is called by tb_find_slow() too. So, as far as i understand if tb_find_slow() find the previously cached PC on the TB vector, your dump_pc() helper functions will not be called again for this TB. Did you get correct values for your counters in bbvs[bb] ? I didnt run your patch yet so I m not sure that I said is 100% correct. :) ________________________________ De: Vince Weaver <vi...@csl.cornell.edu> Para: Boris Cámara <ves...@rocketmail.com> Cc: qemu-devel@nongnu.org Enviadas: Segunda-feira, 5 de Abril de 2010 22:41:52 Assunto: Re: [Qemu-devel] full dynamic instruction trace for MIPS target > I think the correct way to get the full instruction trace on a MIPS > emulated processor is: the way you describe is slow because you are constantly re-generating the TBs. The best way to do this is to add your instrumentation to the TBs. I have code that does that for a recent version of Qemu here: http://www.csl.cornell.edu/~vince/projects/qemusim/ although it outputs Basic-Block vectors, not a full memory trace like you want. It has been validated to match proper instruction counts using hardware performnce counters though. I also have code creating full instruction/memory traces for Qemu MIPS that can be found here: http://www.csl.cornell.edu/~vince/projects/qemu-trace/ but it's against Qemu from 2007 pre-dating the TCG changeover so of limited use probably. I hvae some code somewhere that updated this to work with TCG but I don't know what happened to it. Vince ____________________________________________________________________________________ Veja quais são os assuntos do momento no Yahoo! +Buscados http://br.maisbuscados.yahoo.com
