On 04/23/2010 04:02 PM, Chris Lalancette wrote:
On 04/23/2010 07:05 AM, Avi Kivity wrote:
On 04/22/2010 10:55 PM, Gleb Natapov wrote:
What about converting PIC/IOAPIC mutexes into spinlocks?
Works for me, but on large guests the spinning will be noticeable.
I believe.
For interrupts going through IOPIC, but we know this is not scalable
anyway.
Yes. We also wanted to convert the ioapic/pic to spinlocks so we could
queue the interrupt from the PIT directly instead of using
KVM_REQ_PENDING_TIMER which keeps confusing me. Chris Lalancette posted
a patchset for this a while back but it was never completed.
Yeah, I'm sorry I never completed it. It turns out that with the HPET
changes that went in around the time I was looking at it, that set of
patches wasn't really required to fix the problem I was seeing with kdump.
That being said, if it's useful to somebody, I can repost the patches
(though they are woefully out-of-date now). Let me know if you want
to see them again.
Let's see if one of the alternatives works out. I prefer to keep the
critical sections short.
--
Do not meddle in the internals of kernels, for they are subtle and quick to panic.
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