>>>> A usecase is device can set a exclusive CMA area up when system boots. >>>> When device needs 4800 * order-4 pages, it could call this bulk against >>>> of the area so that it could effectively be guaranteed to allocate >>>> enough fast. >>> >>> Just wondering >>> >>> a) Why does it have to be fast? >> >> That's because it's related to application latency, which ends up >> user feel bad. > > Okay, but in theory, your device-needs are very similar to > application-needs, besides you requiring order-4 pages, correct? Similar > to an application that starts up and pins 300M (or more), just with > ordr-4 pages. Pinning was probably misleading. I meant either actual pinning, like vfio pins all pages backing a VM e.g., in QEMU, or mlocking+populating all memory. -- Thanks, David / dhildenb
