On Sun, 31 Aug 2008, Karthik Singaram Lakshmanan wrote: > Hi, > I am a noob to SMP real-time scheduling in linux, I have a question of > sched_setaffinity(). If I restrict an application to a single CPU > using the appropriate cpumask for sched_setaffinity(), Is it > guaranteed that the kernel will never schedule it on any other CPU? I > am asking this because looking at kernel/sched.c seems to use > cpu_clear during load balancing. I am interested in knowing whether the > cache will be invalidated when my task is assigned to a single CPU. > Are there exceptions where the cpu-mask will be overridden? > Thanks for taking the time to answer my query. A task should never be scheduled on a CPU that is not in its affinity. (although I hear a rumor that if a task is bound to a single CPU, and that CPU is taken offline, it will be migrated. But I doubt this is true, since there are tasks that would crash the system if this were true). -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
