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[2003:d8:2f25:700:d846:15f3:6ca0:8029]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3d92d51982bsm27196227f8f.21.2025.09.08.11.50.01 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 08 Sep 2025 11:50:02 -0700 (PDT) Message-ID: Date: Mon, 8 Sep 2025 20:50:00 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 22/22] mm/mshare: charge fault handling allocations to the mshare owner To: Anthony Yznaga , linux-mm@kvack.org Cc: akpm@linux-foundation.org, andreyknvl@gmail.com, arnd@arndb.de, bp@alien8.de, brauner@kernel.org, bsegall@google.com, corbet@lwn.net, dave.hansen@linux.intel.com, dietmar.eggemann@arm.com, ebiederm@xmission.com, hpa@zytor.com, 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> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam02 X-Rspamd-Queue-Id: 48C3F120005 X-Stat-Signature: kxcta3oooi6afesfaxgnnydf6icyxdf8 X-HE-Tag: 1757357407-618238 X-HE-Meta: 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 gTjgWRYX jrhHEBaMqipopXD+gFsbBDMtgIAW6oZo7igb/XUGsKT71Ku0= 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 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. -- Cheers David / dhildenb