On Wed, Aug 15, 2018 at 00:53:23 -0400, Emilio G. Cota wrote: > On Wed, Aug 15, 2018 at 11:09:42 +0800, Fam Zheng wrote: > > On Mon, 08/13 13:11, Emilio G. Cota wrote: > > > + --enable-sync-profiler) sync_profiler="yes" > > > + ;; > > > > Curious, not asking for a change: can this be made a runtime option instead > > of > > compile time, since there's no library dependencies? That should make this > > somewhat easier to use. > > Good point. I'll do some profiling tomorrow to see how the latency > of the locking primitives could be minimized (ideally, not using > the profiler should just add a well-predicted branch).
I reduced it to just a branch, but still, I measured a few percentage points (1-2%, depending on the machine) slowdown when this is a run-time option. (This is for a bootup+shutdown test of a guest.) So I'll keep it as a build-time option, then. Thanks, Emilio