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jakub.wartak@mailbox.org, jannh@google.com, juri.lelli@redhat.com, khalid@kernel.org, liam.howlett@oracle.com, linyongting@bytedance.com, lorenzo.stoakes@oracle.com, luto@kernel.org, markhemm@googlemail.com, maz@kernel.org, mhiramat@kernel.org, mgorman@suse.de, mhocko@suse.com, mingo@redhat.com, muchun.song@linux.dev, neilb@suse.de, osalvador@suse.de, pcc@google.com, peterz@infradead.org, pfalcato@suse.de, rostedt@goodmis.org, rppt@kernel.org, shakeel.butt@linux.dev, surenb@google.com, tglx@linutronix.de, vasily.averin@linux.dev, vbabka@suse.cz, vincent.guittot@linaro.org, viro@zeniv.linux.org.uk, vschneid@redhat.com, willy@infradead.org, x86@kernel.org, xhao@linux.alibaba.com, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org References: <20250820010415.699353-1-anthony.yznaga@oracle.com> <20250820010415.699353-23-anthony.yznaga@oracle.com> Content-Language: en-US From: Anthony Yznaga In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed 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 qANPuA3P 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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.