On Tue, Feb 28, 2012, Avi Kivity wrote about "Re: [PATCH] vhost: don't forget
to schedule()":
> > + if (need_resched())
> > + schedule();
>
> This is cond_resched(), no?
It indeed looks similar, but it appears there are some slightly
different things happening in both cases, especially for a preemptive
kernel... Unfortunately, I am not astute (or experienced) enough to tell
which of the two idioms are better or more appropriate for this case.
The idiom that I used seemed right, and seemed to work in my tests.
Moreover I also noticed it was used in vmx.c. Also, vhost.c was already
calling schedule(), not cond_resched(), so I thought it made sense to
call the same thing...
But I now see that in kvm_main.c, there's also this:
if (!need_resched())
return;
cond_resched();
Which seems to combine both idioms ;-) Can anybody shed a light on what
is the right way to do it?
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Nadav Har'El | Tuesday, Feb 28 2012,
[email protected] |-----------------------------------------
Phone +972-523-790466, ICQ 13349191 |I am logged in, therefore I am.
http://nadav.harel.org.il |
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