Re: [patch] Performance Counters for Linux, v3

Chris Friesen
2008-12-12T19:46:26Z

stephane eranian wrote:

> What happens in the following test case:
>
> - 2-way system (cpu0, cpu1)
>
> - on cpu0, two processes P1, P2, each self-monitoring and counting event E1.
> Event E1 can only be measured on counter C1.
>
> - on cpu1, there is a cpu-wide session, monitoring event E1, thus using C1
>
> - the scheduler decides to migrate P1 onto CPU1. You now have a
> conflict on C1.
>
> How is this managed?

Prevent the load balancer from moving P1 onto cpu1?

Chris