I think we can use performance counter. use unhalted core cycles event, in the nmi callback funcation, count which process is running . if the vm exit is caused by nmi,discard it. the system time of qemu process is the time steal by kvm.
2011/1/30 Avi Kivity <[email protected]>: > 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. > > -- > error compiling committee.c: too many arguments to function > > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
