On Mon, 5 Nov 2012, KY Srinivasan wrote: > The Hyper-V host has a policy engine for managing available physical memory > across > competing virtual machines. This policy decision is based on a number of > parameters > including the memory pressure reported by the guest. Currently, the pressure > calculation is > based on the memory commitment made by the guest. From what I can tell, the > ratio of > currently allocated physical memory to the current memory commitment made by > the guest > (vm_committed_as) is used as one of the parameters in making the memory > balancing decision on > the host. This is what Windows guests report to the host. So, I need some > measure of memory > commitments made by the Linux guest. This is the reason I want export > vm_committed_as. >
I don't think you should export the symbol itself to modules but rather a helper function that returns s64 that just wraps percpu_counter_read_positive() which your driver could use instead. (And why percpu_counter_read_positive() returns a signed type is a mystery.) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
