Re: [PATCH v2 6/8] Revert use of clock_gettime for benchmarking

[Paolo Bonzini <pbonzini@redhat.com>]

On 10/18/24 15:20, Aleksandar Rakic wrote:
> This patch reverts the commit (with SHA
> 50290c002c045280f8defad911901e16bfb52884 from
> https://github.com/MIPS/gnutools-qemu) that breaks for mingw builds,
> where clock_gettime and CLOCK_MONOTONIC are not available.
> 
> Cherry-picked d57c735e1af1ca719dbd0c3a904ad70c9c31cbb7
> from https://github.com/MIPS/gnutools-qemu
> 
> Signed-off-by: Faraz Shahbazker <fshahbazker@wavecomp.com>
> Signed-off-by: Aleksandar Rakic <aleksandar.rakic@htecgroup.com>

Can you change it to use qemu_clock_get_ns(QEMU_CLOCK_REALTIME) instead? 
  It's the same as clock_gettime() on POSIX systems and works on Windows 
as well.

Plus, because the result is just use uint64_t, tsub and tdiv become 
simple subtraction and (double)a / b respectively; and timestr is also 
just as simple with:

-    double frac_sec = tv->tv_nsec / 1e9;
+    uint64_t sec = nsec / NANOSECONDS_PER_SECOND;
+    double frac_sec = (nsec % NANOSECONDS_PER_SECOND) / 1e9;

Paolo