On Tue, Feb 24, 2015 at 11:07:37PM +0000, Peter Crosthwaite wrote: > ARM64 has the yield nop hint which has the intended semantics of > cpu_relax. Implement. > > The immediate application is ARM CPU emulators. An emulator can take > advantage of the yield hint to de-prioritise an emulated CPU in favor > of other emulation tasks. QEMU A64 SMP emulation has yield awareness, > and sees a significant boot time performance increase with this change.
Could you elaborate on the QEMU SMP boot case please? Usually SMP pens for booting make use of wfe/sev to minimise the spinning overhead. Will -- 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/
