On Thu, Apr 19, 2007 at 09:13:46PM -0500, Gregory Smith wrote:
> The primary problem I face with your patch is that the timer ticks are
> not interrupting at even intervals. While things /do/ work the way we
> discussed, the clock was slipping all over the place. Sleeps inside
> the VM were in sync and preserved when the VM was paused, but their
> real-time value was intrinsically unreliable.
I saw the same thing, if I understand what you mean. I was seeing
very irregular intervals, including the host clock going backwards on
occasion.
Although, now that I'm thinking about it, some of the irregularity
might be due to how UML handles signals. They're not actually
blocked. When signals aren't allowed, a flag is set saying that, the
signals arrive as usual, except they don't go any further, except to
set another flag that says that they happened. When signals are
enabled, this flag is checked, and the actual handling happens.
This might make timers less regular, but it doesn't explain the host
gettimeofday going backwards.
> I'll be working with this more over the weekend, and I'll let you know
> if things break. For now, I need to divert my energies towards
> homework. Thanks again for your quick responses!
You did point out a real bug, and I'll be sending the fix to mainline.
Jeff
--
Work email - jdike at linux dot intel dot com
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