On Thu, Oct 14, 2010 at 01:11:20PM +0200, Avi Kivity wrote:
> On 10/14/2010 12:29 PM, Gleb Natapov wrote:
> >On Thu, Oct 14, 2010 at 12:27:15PM +0200, Avi Kivity wrote:
> >> On 10/10/2010 05:46 PM, Gleb Natapov wrote:
> >> >>
> >> >> We should log both errno and exit_reason. If we want to be clever,
> >> >> we can display strerror(errno) if it's nonzero, and exit_reason
> >> >> otherwise (easy to do in a trace-cmd plugin).
> >> >>
> >> >For starters we should remove KVM_EXIT_INTR exit reason. Looking into
> >> >qemu-kvm history it was never used and there is at least one code path
> >> >that returns -EINTR and does not set KVM_EXIT_INTR, so exit_reason field
> >> >contains stale info on exit.
> >> >
> >>
> >> The two issues are unrelated.
> >>
> >So what do you propose? I see no issue with my original patch.
>
> Record both errno and exit_reason. While they're never both valid
> at the same time, they're both necessary.
>
If they can't be valid at the same time, why not record one of them? The
one that happened? Also any error other then -EINTR will cause qemu to
stop, so it is not very interesting. And ioctl return value can be
traced by strace anyway.
--
Gleb.
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