On 04/05/2018 12:45, Peter Zijlstra wrote: > On Thu, May 03, 2018 at 04:38:23PM +0300, Alexander Shishkin wrote: >> On Thu, May 03, 2018 at 02:50:12PM +0200, Paolo Bonzini wrote: > >>> And you still need the module parameter to decide >>> whether the host is _allowed_ to cause incomplete traces in the guest. >> >> Or rather a parameter to decide who wins in case both host and guest want >> to trace the guest. That's arguably better than having different versions of >> PT in the guest depending on a module parameter setting. > > Yes, that sounds like a much better approach. I don't think so. The possibility that the host would lose tracing data just because the guest starts using PT seems hideous to me... Paolo
