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Thu, 12 Feb 2026 18:22:03 -0800 (PST) MIME-Version: 1.0 References: <20260206121151.dea3633d1f0ded7bbf49c22e@linux-foundation.org> In-Reply-To: From: Kairui Song Date: Fri, 13 Feb 2026 10:21:27 +0800 X-Gm-Features: AZwV_QjIdYYLeq0-W9Pd3UDvXrzxCZ0JUOqu-ddbGxVhDOCh8J5eNSV1mMQvUlc Message-ID: Subject: Re: [Bug 221055] New: Hibernate image write 10x slower since commit 0ff67f990bd4 ("mm, swap: remove swap slot cache") To: Carsten Grohmann Cc: Andrew Morton , bugzilla-daemon@kernel.org, Baoquan He , Nhat Pham , Yosry Ahmed , linux-mm@kvack.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Server: rspam12 X-Stat-Signature: h3z1msgibtqeqdyu8ikompnkqufwim1k X-Rspamd-Queue-Id: 5CCFE18000D X-Rspam-User: X-HE-Tag: 1770949325-223844 X-HE-Meta: U2FsdGVkX1/i+WIP5c4gFw8cqRifRDtNy44cE0QqAQetS8iNk7cFWr7Wu5ptNcbb6u+Rbir74Gk9tqNghxcMNtAFJj6XuGDaOZZTJhs0fWJvk8qP4K2geb+ypbhTJps5bhQ59KeXTySScFRIxGH+ya5B2W+z+Jz6N7y78ijr0Oqf19w6H/UW1e87hHQJn8e6AHKZ5rR7aEoQ2fG832/eSsVFs3ibyW/4Vj59PbBO/KKfqb0ziyT+cCBYPF0XMIx0Qe4ozw+pIuQo5K71ALlDisSGP3PxOvjm8g0gc/Zl9e9ng9z0gH3FdNwerUrkDctpBM9PCZ/hn+SNfCwBzjqI/3OGl47MWJ+3l5hKP1ifItMTjsGgPosGJa/s7bnFj4CUhGQ0Fp/IYjp23zXv7TcJSDMRGy6vGza1UbjHwbMGBBt5kxdEBscjoKjhb/eELIua/j3Xycjkm1iYC6BdHC8qYxCshLpilpI2+LZadk6+znAuVg9ikK6SqrMxiWui8wc4KCpU9XtAAM/8q58B+cTU+1AAVX52O9XKCjC3Y/jPZ6//ag30IZRAeIjn+L2fvB87/r8oYarlFL6LFr8X4IH2SGwMBZNhSvnybUr16f8bWCKc1/RiQw6W1NRrM4cRwqv51WgQZsqAr7cZow2eXHCYx4Un6H0JdbXA3FOE6RAR8hv1wD0AWHxMrokw4QAZNRgcFjxKa7p7GIckUNyPl4A2mUh8LmZwTWUAEj6zosfhYBxOQ7IL+NWhneh8nZDv1z6CSaKVaUBRM37cpXdLf/A36YbAYNfMKhTjrpdpyCfOBEaUDsWWvJgVquyOdBOpNHEOHABn4WmjQZJUIBmOHxOc2MRoE1f37DHKy7ILL23ehl5KSHcrABXmljtYZIouZyPIufh+fkau17Umm1FaxATNTumzoFhq9Jl2G3d3iPo2VxoYWnsLu20rwNVEuLLNEk0+uMOyrJgRKl+nN6awNAu fP0YIa+j GH22ximpmVyXd4P0c6wvpiHYMqXqQ+VXJjOn9rCFsOH5j++0gMZ+BRapbx2fRaoyWNhTNv/VI4rqHFW6YeGOIXOUDKLPkU0FM3k6nq+3lsj3yXUIDRE515ZDrXjX2Wr42PB1cHrqyjiX/+YiU8jRtcLJfAAPtE0E9bC6ZhIuDrgiC90TUntcyPHQX6HqySKQsuvmMLRfTw04zDbMFCrLeRl+ijk0NsGduIczNv+yoF36457cECZjtoByHMMFDBXQRy85CEuIpAIVZCK1meuoN78qU58e40CbXHYqXe/SyriDoNlCqVKvDbJ8aHwzmKG0A6bPCreQtizpTxviWdHeue9Vn0kp7gEOJgzvpMtRZhQguJ8gVp09xogA4Jfc4wiGj5V+Hj5jicJu5Xf9DIHNGNrEoaouIrzV1szX6qWVfKvWZIPU5zpeIzoT2lZsqbSwdnjSH 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: Carsten Grohmann =E4=BA=8E 2026=E5=B9=B42=E6=9C=88= 13=E6=97=A5=E5=91=A8=E4=BA=94 04:37=E5=86=99=E9=81=93=EF=BC=9A > > 12.02.2026 20:01:48 Kairui Song : > > > And can anyone help verify this fix? I'll also try some other SSD later > > maybe that's only reproducible with SSD that have very poor 4K > > performance. > I'll try out your patch over the weekend. Thanks a lot! > > > HDD should not be affected because the allocator has a special > > way to do HDD allocation. > I can connect an older hard drive to my PC and test this as well. Should > I do that? If it's not necessary, then I can save myself the effort. That's not necessary, let's just verify the issue you reported. I have been running swap tests on HDD for a while and hibernate uses the same allocation method, the performance is good so far, I can double check that.