On Tue, 2011-11-15 at 15:45 +0200, Avi Kivity wrote: > What about function traces? Will any noninlined calls cause the same > problem? >
Both function_graph and function tracing have recursion protection around the users of the call. function tracing is much lighter weight than function_graph tracing. The problem here was that function_graph tracing does some accounting, and calls the clock handler outside the recursion protection. I need to add recursion protection around the accounting too. But I still want to warn when it happens as recursion protection protects from crashing, but recursion is still bad because it still goes through a bit of arch specific setup before the recursion is detected, slowing function_graph tracing down much more than function tracing when it recurses. -- Steve -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
