On Wednesday, May 25, 2016 1:50:39 PM CEST David Miller wrote:
> From: Arnd Bergmann <a...@arndb.de>
> 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
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