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AJvYcCWmKEQSdx6P6Yi1NGXPW0NbD2xFrAafzPC6Z13UYo56EvGJS4fjoE/XaOaZimamCQAL8IaebRnDSA==@kvack.org X-Gm-Message-State: AOJu0YyF4AfOO9NmJEAC1+34p4Lc0HSRt/cMUXkWSfpDvWHLtUtZqqh5 kZMxA0lbeUA8QCAA3Z74eJv1hIOoQKDp+M644t/V+4OFUPBeExcWZ9yqNHrMtsdxbjmw5xbUiku 9pnbTFyoJkQqKeztVI63dO5ixZiUNNWiR8fJK X-Google-Smtp-Source: AGHT+IGnVqBio1zlKGUMToQfAK4cV8yQz2U2vGERd0VOLHEomgPLoa49Q6KNrjxkO7TF7Sp+1ac34yO6/sa++XFtBPc= X-Received: by 2002:a05:6214:40e:b0:6cb:c9cf:cd40 with SMTP id 6a1803df08f44-6d2b48b67d1mr52075746d6.8.1730224539928; Tue, 29 Oct 2024 10:55:39 -0700 (PDT) MIME-Version: 1.0 References: <20241027011959.9226-1-21cnbao@gmail.com> <678a1e30-4962-48de-b5cb-03a1b4b9db1b@gmail.com> <6303e3c9-85d5-40f5-b265-70ecdb02d5ba@gmail.com> <64f12abd-dde3-41a4-b694-cc42784217fb@gmail.com> <882008b6-13e0-41d8-91fa-f26c585120d8@gmail.com> <228c428d-d116-4be1-9d0d-0591667b7ccb@gmail.com> <03d4c776-4b2e-4f3d-94f0-9b716bfd74d2@gmail.com> In-Reply-To: From: Yosry Ahmed Date: Tue, 29 Oct 2024 10:55:02 -0700 Message-ID: Subject: Re: [PATCH RFC] mm: count zeromap read and set for swapout and swapin To: Nhat Pham Cc: Barry Song <21cnbao@gmail.com>, Usama Arif , akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Barry Song , Chengming Zhou , Johannes Weiner , David Hildenbrand , Hugh Dickins , Matthew Wilcox , Shakeel Butt , Andi Kleen , Baolin Wang , Chris Li , "Huang, Ying" , Kairui Song , Ryan Roberts , joshua.hahnjy@gmail.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 1759BC0009 X-Rspamd-Server: rspam01 X-Stat-Signature: kk3smsk4bkf9kmmyjnidhhrsomhz6hew X-HE-Tag: 1730224515-162934 X-HE-Meta: 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 +mIXxIrk I+gJh7TS1SA2Z3LbIugimrA7d2KAMJh+5m1IVKhkdvbbSuyN5FkXeLmLad3LWkSDm5OAzLJAsHTec5HXh0rNsd3iAVv+GT1GvHh1qY19Ie/WNValmtoB9+RclY36OnS5sz8NipncKIxDKo/sUJJoE9xQznFdeY6VYDtj5V/tmqi01zDBcLV+xSRAIn4Gsx8o+Z8paBcVa2BgkgEzuogrmbGB1cSUy+5w+2jiwDj3QplMa/ctowezONHOsaMJlmceZlMUtuWJKH9yov+8= 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: > FWIW, the swap abstraction layer Yosry proposed last year (and I'm > working on right now) will allow you to store these zeromapped swap > entries without requiring any swap slots allocated on the swapfile. > It's basically the same thing as swap/zswap decoupling. I don't know if I said this before, but thank you for keeping this alive. Much appreciated :) > > Not stopping you guys from optimizing it, since all I have right now > is a (most certainly buggy) prototype + there might be benefits if we > can get around the swap subsystem altogether for these zero mapped > entries. Just letting you know there's a backup plan :)