On Thu, Feb 29, 2024 at 11:34:33AM -0700, Yu Zhao wrote: > Compared with the hugeTLB pool approach, THP zones tap into core MM > features including: > 1. THP allocations can fall back to the lower zones, which can have > higher latency but still succeed. > 2. THPs can be either shattered (see Chapter Two) if partially > unmapped or reclaimed if becoming cold. > 3. THP orders can be much smaller than the PMD/PUD orders, e.g., 64KB > contiguous PTEs on arm64 [1], which are more suitable for client > workloads. Can this mechanism be used to fully replace the hugetlb pool approach? That would be a major selling point. It kind of feels like it should, but I am insufficiently expert to be certain. I'll read over the patches sometime soon. There's a lot to go through. Something I didn't see in the cover letter or commit messages was any discussion of page->flags and how many bits we use for ZONE (particularly on 32-bit). Perhaps I'll discover the answer to that as I read.
