Re: [LSF/MM/BPF TOPIC] Flexible orders for anonymous folios

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On Sun, Feb 26, 2023 at 09:30:31AM +0800, Hillf Danton wrote:
> On Wed, Feb 22, 2023 at 04:55:20PM -0700, Yu Zhao wrote:
> > Currently anonymous folios only support two orders: 0 and the PMD
> > order. Flexible orders for anonymous folios can resist both internal
> > or external fragmentations when the PMD order is too underutilized or
> > costly to allocate. Flexible orders can also leverage the TLB
> > coalescing feature, .e.g., order 3 for AMD and order 4 for ARM CPUs.
> > 
> > Discussion points:
> > 1. The page fault path: determining the best order and the fallback policy.
> > 2. The reclaim path: detecting the utilization and the splitting policy.
> > 3. The refcount and the mapcount models, e.g., reuse the PMD-mapped
> > THP model or not.
> > 4. The splitting, and the collapsing if needed.
> > 5. Other paths: COW, GUP, madvise(), mprotect(), page migration, etc.
> 
>   6. Given the number of TLB is farrr less than the number of pages,
>      what workload prefers MADV_ORDER6 over MADV_HUGEPAGE for instance? 

Many.  https://lore.kernel.org/linux-mm/Y%2FWRlX+MkmxelNbg@xxxxxxxxxxxxxxxxxxxx/





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