On Wednesday, May 25, 2016 1:50:39 PM CEST David Miller wrote: > From: Arnd Bergmann <arnd@xxxxxxxx> > Date: Wed, 25 May 2016 22:47:33 +0200 > > > If we use the normal calling conventions, we could remove these overrides > > along with the respective special-case handling in glibc. None of them > > look particularly performance-sensitive, but I could be wrong there. > > You could set the lowest bit in the system call entry pointer to indicate > the upper-half clears should be elided. Right, but that would introduce an extra conditional branch in the syscall hotpath, and likely eliminate the gains from passing the loff_t arguments in a single register instead of a pair. Arnd -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
