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AJvYcCW2DHRGN7hCgBWCHgM6gDFewctO5QysfKau9psX+OxJWhrfKpFOWM0s00SeVz0cHk1t9EYPygYPWw==@kvack.org X-Gm-Message-State: AOJu0YwHiwCNuXKyswSyu2IazWsWpIx7DMGRdA6+yZDpOc800vAu7Scl qB6WF9qe+DeXPr75QJ4RchBUsZ+6odjSFs7bmskZ9pqMhdOEXqiipADqUwkvK0H1VItAtE8zK6G 44gitUmOkYwtcUNlYpu21fUr0fHnNq24= X-Gm-Gg: ASbGncvvk1bt8A9jaIyNXA2hyrPXoCV+CFZaQ3/EPmZKZAdwR+6dmuJoP/7wlwu9H45 nim2XhQ1q0eqthttRMdlUv1rV1RNZNkqueqssrdK7EhKuXN1HzR1GyWQLfZ2BUYk1MYU8i2uO5c dKWrD0KI4BsHNBDtBTvp4c25fQHaKTHu6we0N4G5qMBKaB4puRQbasxKTY4Lkk9z9kxgrg9FsZ1 ea6LCVx8DQTHkoJ8kqx5ABzMPx2hnIupwpBAeDWPc5p7QddPUelgLaOUtyxXWWoXCsA X-Google-Smtp-Source: AGHT+IEnsr51HAAycnl5TJWtojVCtdeDbTLi5HrOIWN/EM0aj7tT4qSjlzWUR1EkpvLjmCuZMzthdHU4KSmPdfVDcS0= X-Received: by 2002:a05:6102:1516:b0:5d5:f6ae:38d5 with SMTP id ada2fe7eead31-5d5f6ae3b8bmr6904190137.42.1760474568697; Tue, 14 Oct 2025 13:42:48 -0700 (PDT) MIME-Version: 1.0 References: <20250909065349.574894-1-liulei.rjpt@vivo.com> In-Reply-To: From: Barry Song <21cnbao@gmail.com> Date: Wed, 15 Oct 2025 04:42:36 +0800 X-Gm-Features: AS18NWDkw8474qAcz1fNrydjfJ00yxfFAbDaJ_VQwKfXsjjmOArAdgWL5vP-vUY Message-ID: Subject: Re: [PATCH v0 0/2] mm: swap: Gather swap entries and batch async release To: Lei Liu Cc: Kairui Song , Michal Hocko , David Rientjes , Shakeel Butt , Andrew Morton , Kemeng Shi , Nhat Pham , Baoquan He , Chris Li , Johannes Weiner , Roman Gushchin , Muchun Song , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Brendan Jackman , Zi Yan , "Peter Zijlstra (Intel)" , Chen Yu , Hao Jia , "Kirill A. Shutemov" , Usama Arif , Oleg Nesterov , Christian Brauner , Mateusz Guzik , Steven Rostedt , Andrii Nakryiko , Al Viro , Fushuai Wang , "open list:MEMORY MANAGEMENT - OOM KILLER" , open list , "open list:CONTROL GROUP - MEMORY RESOURCE CONTROLLER (MEMCG)" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: DA9592000B X-Stat-Signature: no37nzf4pm5ww498q1tn3q11azsn8i8y X-HE-Tag: 1760474569-768693 X-HE-Meta: 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 UnH1sft2 2ywzK3KuPhnrZTfhJJrCsak3+TGP5B7Rc+7xrnI4tLFSJqSfylWb+jx40uVG5ojNzy03Od81Ab4d9TTwTyym7kOjoG884PDMf1VOyMTz2eLDbbpxWeQw3qxG+9SmKg1Gxu8nBXljLoosBefAEmnEcJvvsS45PmxAgecBzbofMIkj/Grh3qZ9FajkYzNWlb12VSlIVEOCwch0y1dnXRj4UbidhrnAFEgam3/Mr5DMLa8+vkRDlHSIljdaIT8i0PlfM4nbhZavffA8V/oJdfoXHa5nEglGWHgXj6AdMtdn/oL/jVSwMG6udgjqJ+SmBOzTIj962+Omf7VcKG3Px/XSi8Nc0qm3/gpAmwkDFfuIO2F/6xxo= 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: > > Hi Barry > > Thank you for your question. Here is the issue we are encountering: > > Flame graph of time distribution for douyin process exit (~400MB swapped)= : > do_notify_resume 3.89% > get_signal 3.89% > do_signal_exit 3.88% > do_exit 3.88% > mmput 3.22% > exit_mmap 3.22% > unmap_vmas 3.08% > unmap_page_range 3.07% > free_swap_and_cache_nr 1.31%**** > swap_entry_range_free 1.17%**** > zram_slot_free_notify 1.11%**** If 1.11/1.31, or 85% of free_swap_and_cache_nr, comes from zram_free, it=E2=80=99s clear that the swap/mm core is not the right place for this op= timization. As it involves too much complexity=E2=80=94for example, synchronization bet= ween swapoff and your new threads. > zram_free_hw_entry_dc 0.43% > free_zspage[zsmalloc] 0.09% Thanks Barry