On 01/28/2011 09:52 PM, Glauber Costa wrote:
This patch accounts steal time time in kernel/sched. I kept it from last proposal, because I still see advantages in it: Doing it here will give us easier access from scheduler variables such as the cpu rq. The next patch shows an example of usage for it. Since functions like account_idle_time() can be called from multiple places, not only account_process_tick(), steal time grabbing is repeated in each account function separatedely.
I accept that steal time is worthwhile, but do you have some way to demonstrate that the implementation actually works and is beneficial?
Perhaps run two cpu-bound compute processes on one vcpu, overcommit that vcpu, and see what happens to the processing rate with and without steal time accounting. I'd expect a fairer response with steal time accounting.
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