On 05/15/2018 11:53 AM, Qing Huang wrote: > >> This is control path so it is less latency-sensitive. >> Let's not produce unnecessary degradation here, please call kvzalloc so we >> maintain a similar behavior when contiguous memory is available, and a >> fallback for resiliency. > > No sure what exactly degradation is caused by vzalloc here. I think it's > better to keep physically contiguous pages > to other requests which really need them. Besides slow path/mem compacting > can be really expensive. >
Just use kvzalloc(), and you get the benefit of having contiguous memory if available, without expensive compact phase. This thing _automatically_ falls back to vmalloc(), thus your problem will be solved. If you are not sure, trust others.
