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wrote: > On Tue, Sep 16, 2025 at 10:39:53AM +0100, Lorenzo Stoakes wrote: > > On Tue, Sep 16, 2025 at 10:29:11AM +0100, Kiryl Shutsemau wrote: > > > On Tue, Sep 16, 2025 at 02:21:26PM +0800, Lance Yang wrote: > > > > Users of mlock() expect low and predictable latency. THP collapse is a > > > > heavy operation that introduces exactly the kind of unpredictable delays > > > > they want to avoid. It has to unmap PTEs, copy data from the small folios > > > > to a new THP, and then remap the THP back to the PMD ;) > > > > > > Generally, we allow minor page faults into mlocked VMAs and avoid major. > > > This is minor page fault territory in my view. > > > > Hm, but we won't be causing minor faults via reclaim right, since they're > > not on any LRU? > > PTEs are still present when we do THP allocation. No reclaim while the > access is blocked. We only block the access on copy and PTEs->PMD > collapse. Right indeed, esp. with compaction being allowed for mlock, I agree with you that this patch should be dropped :) > > -- > Kiryl Shutsemau / Kirill A. Shutemov Cheers, Lorenzo