On Fri, Apr 24, 2015 at 10:36:14PM -0300, Marcelo Tosatti wrote: > > Drop unnecessary rdtsc_barrier(), as has been determined empirically, > see 057e6a8c660e95c3f4e7162e00e2fee1fc90c50d for details. > > Noticed by Andy Lutomirski. > > Improves clock_gettime() by approximately 15% on > Intel i7-3520M @ 2.90GHz. > > Signed-off-by: Marcelo Tosatti <[email protected]> > > diff --git a/arch/x86/include/asm/pvclock.h b/arch/x86/include/asm/pvclock.h > index 25b1cc0..a5beb23 100644 > --- a/arch/x86/include/asm/pvclock.h > +++ b/arch/x86/include/asm/pvclock.h > @@ -86,7 +86,6 @@ unsigned __pvclock_read_cycles(const struct > pvclock_vcpu_time_info *src, > offset = pvclock_get_nsec_offset(src); > ret = src->system_time + offset; > ret_flags = src->flags; > - rdtsc_barrier(); > > *cycles = ret; > *flags = ret_flags; > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html
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