On Tue, 2010-09-21 at 14:33 +0100, Stefan Hajnoczi wrote: > > net.c qemu_deliver_packet(), etc - network statistics > > Yes. Further digging into the code in the net/ directory, there are more functions that should be traced/probed - e.g. a lot of the net_socket* routines. Given that SystemTap, LTTng, and DTrace have extremely close to zero overhead at each probe point, adding them into code can provide users different performance resolutions into the networking code. > > <CPU Arch>/op_helper.c global_cpu_lock(), tlb_fill() - lock & unlock, > > and TLB refill statistics > > These are not relevant to KVM, they are only used when running with > KVM disabled (TCG mode). Hmm, while my main objective is to add probes for KVM, if they are useful to QEMU, I may as well add them to my patch. > > balloon.c, hw/virtio-balloon.c - ballooning information. > > Prerna added a balloon event which is in qemu.git trace-events. Does > that one do what you need? Thanks for the info. > > I will see what other probes are useful for the end users. Also, are > > there developer documentations for KVM? (I googled but found a lot of > > presentations about KVM but not a lot of info about the internals.) > > Not really. I suggest grabbing the source and following vl.c:main() > to the main KVM execution code. I was looking for the hardware interfacing code earlier this morning -- QEMU has the hardware specific directories (e.g. target-i386/ , target-ppc/ ), and I was trying to understand the execution environment when the host and guest are running on the same architecture. I believe cpu_gen_code() and other related functions are what I should dig into... Rayson > > Stefan > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
