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a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=GoEa3M9JfhUA:10 a=i-pEsNv00SWCavqrx0oA:9 a=QEXdDO2ut3YA:10 On 9/8/25 11:50 AM, David Hildenbrand wrote: > On 20.08.25 03:04, Anthony Yznaga wrote: >> When handling a fault in an mshare range, redirect charges for page >> tables and other allocations to the mshare owner rather than the >> current task. >> > > That looks rather weird. I would have thought there would be an easy way > to query the mshare owner for a given mshare mapping, and if the current > MM corresponds to that owner you know that you are running in the owner > context. > > Of course, we could have a helper like is_mshare_owner(mapping, current) > or sth like that. > I'm not quite following you. Charges for newly faulted pages will be automatically directed to the mshare owner because the mshare mm will have its mm_owner field pointing to the owner. On the other hand, allocations for page table pages are handled differently. GFP_PGTABLE_USER causes the accounting to go through __memcg_kmem_charge_page() which will charge them to the memcg for the current task unless unless current->active_memcg is set to point to another memcg.