* Andy Lutomirski <[email protected]> wrote:
> we're following a 32-bit pointer, and the uaccess code isn't smart
> enough to figure out that the access_ok check isn't needed.
>
> This saves about three cycles on a cache-hot fast syscall.
Another request: could you please stick the benchmarking code of the various
x86
system call variants into 'perf bench' - under tools/perf/bench/, so that
measurements can be done on more hardware and can be reproduced easily?
I'd suggest we dedicate an entirely new benchmark family to it: 'perf bench
x86'
and then have:
perf bench x86 syscall vdso
perf bench x86 syscall int80
perf bench x86 syscall vdso-compat
or so?
( I have some perf bench cleanups in -tip, so if you do this please base it on
top
of that. )
Thanks,
Ingo
--
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/
