* Christoph Lameter ([EMAIL PROTECTED]) wrote: > I think the simplest solution may be to leave slub as done in the patch > that we developed last week. The arch must provide a cmpxchg_local that is > performance wise the fastest possible. On x86 this is going to be the > cmpxchg_local on others where cmpxchg is slower than interrupt > disable/enable this is going to be the emulation that does > > interrupt disable > > cmpchg simulation > > interrupt enable > > > If we can establish that this is not a performance regression then we have > a clean solution source code wise. It also minimizes the interrupt holdoff > for the non-cmpxchg_local arches. However, it means that we will have to > disable interrupts twice for the slow path. If that is too expensive then > we need a different solution. >
cmpxchg_local is not used on the slow path... ? Did you meant: it means that we will have to disable preemption _and_ interrupts on the fast path for non-cmpxchg_local arches ? Or maybe am I thinking about the wrong code snippet there ? -- Mathieu Desnoyers Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F BA06 3F25 A8FE 3BAE 9A68 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
