On Fri, Oct 9, 2015 at 12:32 AM, Ingo Molnar <[email protected]> wrote: > > * 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
I'll play with this. I'm not too familiar with the perf bench stuff. --Andy -- 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/
