On Aug 10, 2014, at 10:24 PM, Richard W.M. Jones wrote: > kvm_alloc_stage2_pgd has to do an order 9 allocation, ie. 512 > contiguous pages I think. > > This often leads to problems running qemu when memory is relatively > low -- eg. if you have one VM running, a healthy number of host > applications, and perhaps "just" 4GB free; then you decide to run the > libguestfs test suite. > > Any suggestions how to deal with this? Hi Richard, As you know, 512 contiguous page allocation comes from KVM_PHYS_SHIFT, which is always 48 regardless of hardware capability. Currently, Cortex-A53 and Cortex-A57 supports up to 40-bit and 44-bit address space, respectively. If KVM_PHYS_SHIFT is bound to hardware, not theoretical number, 48, it is possible to allocate much less contiguous pages. However, if a new Cortex-A, which support 48-bit address space, comes up, the same problem would happen. Best Regards Jungseok Lee _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
