On 08/30/2010 03:20 PM, Peter Zijlstra wrote:
On Mon, 2010-08-30 at 15:17 -0400, Rik van Riel wrote:
When time is accounted as steal time, it is NOT accounted as
to the current process user/system/..., which in turn should
help it in the scheduler.
Am I overlooking something?
Yeah, the scheduler doesn't care about the user/system time accounting
at all... :-)
Uh oh. This would seem like something we'll want to fix
in an architecture independent way, so s390, etc. also
benefit from it.
I can see this being a real problem when the host and guest
OS have the same time slice - which is quite possible since
they may both be the same version of Linux.
Guest 1, alternating between processes A and B, may end up
with process A getting a lot of actual CPU time, and process
B being scheduled in when the VCPU itself is not running...
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