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Sat, 11 Jan 2025 20:38:54 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id BYzOKd7Wgmf8NwAAD6G6ig (envelope-from ); Sat, 11 Jan 2025 20:38:54 +0000 Message-ID: Date: Sat, 11 Jan 2025 21:38:54 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v9 11/17] mm: replace vm_lock and detached flag with a reference count Content-Language: en-US To: Suren Baghdasaryan , Mateusz Guzik , Hillf Danton Cc: akpm@linux-foundation.org, peterz@infradead.org, willy@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, david.laight.linux@gmail.com, mhocko@suse.com, hannes@cmpxchg.org, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, lokeshgidra@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, klarasmodin@gmail.com, richard.weiyang@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com References: <20250111042604.3230628-1-surenb@google.com> <20250111042604.3230628-12-surenb@google.com> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Action: no action X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: DAD7CC000C X-Rspam-User: X-Stat-Signature: g8je991acpeajq54pnmwhun83rz4iw8q X-HE-Tag: 1736627937-551955 X-HE-Meta: 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 pxCnVx2I gIlVkouePz67zbDnOtV2l46WYOmTu9Xlgw2HoMvvFXWFk5GMTG1M8lBS9UDa+6CbSRQYd8FzyqATcDazKnkLcfPSdqsGewk79fJSdWZkzQLjgBypYa2JuGctZg+K/dmctz9I4avR884122agnAs65O5YU4dX0ALhwsmtr1IdTBD/nJtR9GcCBrNmVM+ZpfevLmKWlCCQtzE6Lrp4RO375t1dVHEnc+fHGlqmAzopVbN3JGlSiX3ii0GP/TgRYWj1uDobAHssPl4Glrb4FvBxegkUjrHOspDBr0/uryszJqaF0V2e/9rDbcVUxJD74C0zRVHpcbsQa7c4mvkfnPLfq30q94SudqLReyjFrwREiEWznDhf+GJAUS4wrNVQwhssIKwahCl8ppZ/nUWrQ/i68JPDLTQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000059, 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 1/11/25 21:14, Suren Baghdasaryan wrote: > I plan on replacing refcount_t usage here with an atomic since, as > Hillf noted, refcount is not designed to be used for locking. And will > make sure the down_read_trylock() replacement will provide an acquire > fence. Could Hillf stop reducing the Cc list on his replies? The whole subthread went to only few people :(