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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=kj9zAlcOel0A:10 a=yJojWOMRYYMA:10 a=GoEa3M9JfhUA:10 a=7Be9DysMmW3qWg5aml8A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTEzMDAyOSBTYWx0ZWRfX1zf1DRKzOjl1 WyaAdm1zDDgXPaOQ+nv5aH5BjzBaJb0y/66Se54aLI94GTrB+NQsKy7HYhkm6NKWSfJA+w1yOHB irWNPCt+FisOokSvL3PDXOSVjyrvp/sBq/2x4fmnBn1j7n4GPcQKOU1wctxk+jArBrTkBjZSTyq vH+gdEHjY1Qj+Xx7wNg7A2uWVifAzORrNCFJwlldEn/qXioayxLUKBnLlrg2zo4/KPN5hAYdr9d jC2hYov7/ilqfqbLYTO7kp8N6b3/6G2Zn4VbHmiM9k0/H7qaQBnBgWDeFPjYK/7kE5vobX1rdxt FQcuwHQk8AhjUIdBjWGL/KK+A8eqX6fldkqN6/OhF+b4j193rZZXRv0OKmTZ6nS3MtluiNEFVKF 4P+8oVq/ X-Proofpoint-ORIG-GUID: tdMcSKih7S7lXZkYDIHZsYjJO8WAVp2_ X-Proofpoint-GUID: tdMcSKih7S7lXZkYDIHZsYjJO8WAVp2_ On Tue, Sep 16, 2025 at 10:48:22AM +0100, Kiryl Shutsemau 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