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ACC9e2g8sU1h5XevvtvUDOsMVuJsQDxBrwKcGvDkxL15qCO0KceW/VVsam+D7nhQUwFXSqAowR0iGd/Q4mMqOqqx2MtOwB+Bnva3hjXuGQlMZu+77Y5Ytm6lDT6uJ4HsySQSdpMEpB0qfxlym9B996u+5LeC5d7MvIVCPkTGz42p/kCFx82c9veBVIC1uLlnGtanueWBA/+RfGOiwJds54cqiyonj+UipszTTyfoMDa1QMih1WcOz4mpxlxIY3n3cSWhiFhIIQXSL/iFLGWzyMP2WVrJMTdUlZY5c4trKU91fscDsqC8BRy7whT73OVrhFztB X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11/13/2023 10:02 AM, Huang, Ying wrote: >>> There are other places in the kernel where the PTE is cleared, for >>> example, move_ptes() in mremap.c. IIUC, we need to audit all them. >>> >>> Another possible solution is to check PTE again with PTL held before >>> reading in file data. This will increase the overhead of major fault >>> path. Is it acceptable? >> What if we check the PTE without page table lock acquired? > The PTE is zeroed temporarily only with PTL held. So, if we acquire the > PTL in filemap_fault() and check the PTE, the PTE which is zeroed in > do_numa_page() will be non-zero now. So we can avoid the major fault. Yes. > > But, if we don't acquire the PTL, the PTE may still be zero. For do_numa_page()/change_pte_range(), it does very limit thing during PTE is cleared. Considering the code path of do_read_fault(), it's likely the PTE is none-zero. My concern to acquiring lock is that it brings extra PTL lock acquire/release for other more common cases. Regards Yin, Fengwei > > -- > Best Regards, > Huang, Ying