On Wed, 2017-06-07 at 10:13 -0400, Konrad Rzeszutek Wilk wrote: > On Thu, Jun 01, 2017 at 07:33:33PM +0200, Dario Faggioli wrote: > > > > Patch 5 deserves special mention. In fact, now that we have > > Kconfig, I thought > > it could be a nice thing to make it possible to select, at build > > config time, > > whether we want tracing or not, in the hypervisor (like, for > > instance, we do > > for performance counters). > > Did you have thoughts on perhaps using asm goto as an > alterantive to unlikely? > > In Linux it is called jump labels or such - the idea is that the > code has (by default and on x86) five NOP instructions. But you > can patch it over and add an call to the unlikely code. > Yes, I know. I've never actually looked at the code, but I know they do that, and I think it's cool.
> But perhaps that is more of an future idea as looking at the Linux > code > it looks quite large and not that simple. > I would love for us to do something similar in Xen. I've _thought_ about that many times, but that's it. :-/ Let's see... right now, I can't look into this, as I agree with you that it would be a major piece of work. But yes, it's been in my thoughts! :-) Regards, Dario -- <<This happens because I choose it to happen!>> (Raistlin Majere) ----------------------------------------------------------------- Dario Faggioli, Ph.D, http://about.me/dario.faggioli Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)
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