On Thu, 22 Jan 2015 12:24:47 -0800 Andy Lutomirski <l...@amacapital.net> wrote:
> > Also, please remove the "notrace", because function tracing goes an > > extra step to not require RCU being visible. The only thing you get > > with notrace is not being able to trace an otherwise traceable function. > > > > Is this also true for kprobes? And can kprobes nest inside function > tracing hooks? No, kprobes are a bit more fragile than function tracing or tracepoints. And nothing should nest inside a function hook (except for interrupts, they are fine). > > The other issue, above and beyond RCU, is that we can't let kprobes > run on the int3 stack. If Xen upcalls can happen when interrupts are > off, then we may need this protection to prevent that type of > recursion. (This will be much less scary in 3.20, because userspace > int3 instructions will no longer execute on the int3 stack.) Does this execute between the start of the int3 interrupt handler and the call of do_int3()? -- Steve _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
