On 09/23/2009 05:04 PM, Zhai, Edwin wrote:
Avi,
This is the patch to enable PLE, which depends on the a small change
of Linux scheduler
(see http://lkml.org/lkml/2009/5/20/447).
According to our discussion last time, one missing part is that if PLE
exit, pick up an unscheduled vcpu at random and schedule it. But
further investigation found that:
1. KVM is hard to know the schedule state for each vcpu.
2. Linux scheduler has no existed API can be used to pull a specific
task to this cpu, so we need more changes to the common scheduler.
So I prefer current simple way: just give up current cpu time.
If no objection, I'll try to push common scheduler change first to
linux.
We haven't sorted out what is the correct thing to do here. I think we
should go for a directed yield, but until we have it, you can use
hrtimers to sleep for 100 microseconds and hope the holding vcpu will
get scheduled. Even if it doesn't, we're only wasting a few percent cpu
time instead of spinning.
--
error compiling committee.c: too many arguments to function
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