On Fri, 2012-11-09 at 21:54 +0100, Andi Kleen wrote: > > I'm not sure this is quite true. If a libitm-executed transaction is > > It's just a convention. You don't have to use it.
That's true ... > Not doing it will > just make abort profiling harder. ... but I disagree with this one. This won't only make profiling harder, but it also can have a negative impact on performance. If you think that there's something wrong with the reasons that I gave for why this can be a performance issue, please say why you think so instead of just saying that it's just about profiling. To avoid the potential performance complications, it would probably be sufficient to encourage people to follow this convention. For example, making sure that libitm and other libraries such as glibc are aware of it (or, ideally, follow it) would cover most of the combinations I suppose; perhaps the convention should also be mentioned in the RTM intrinsics header file. Torvald
