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b=VWF0A9jUIsDIf4RCs5BXyowwOSvrSz3CgGBYwd2l6Ijs0Ap3U25FEVv/GLHswkXgU tK5JOF4gDLPa3K258uM691drUtp40UT/n3wKxRQcP7hgo7ClbsLlUW78bxF2+XuSPT 7xAkjrwCyejfH3CSSEosqAtFoOuWWJ0sMc6+VS2VnMgz9i+KmUaagAgLBGTbRozI0I kylJpb5iEgxbHFR21rS2l7LUSZHrUxgab3XZhKE3i9DFZMrZJz5iBYV7TWR4OP5g3P ylR5Z12bVJ7nPCpL1y2wPs4nygz9+LbqX/cwd+kUHLeJOcH2tsrvY2YBIUfBkst2Aw ykkiRGmTbj+8A== From: SJ Park To: Cc: SJ Park , stable@vger.kernel.org, Andrew Morton , Usama Arif , Yueyang Pan , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH v1.2 0/8] mm/damon: fix DAMOS bugs in core, paddr and vaddr Date: Mon, 31 Aug 2026 07:02:39 -0700 Message-ID: <20260831140254.72004-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 8wp7p8upjhixs6irtk7ugf5f6afrsamj X-Rspamd-Queue-Id: 3A04A1C0005 X-Rspamd-Server: rspam02 X-Rspam-User: X-HE-Tag: 1788184984-372801 X-HE-Meta: U2FsdGVkX194dqquul5k+RSCAIFV3LFQeB8TKVPE1Zo7Y4gogcnQiraoSTTXXWDred4B2AXyoSK0S1SZCa446nOIjBzECJSMtv5gkUiXRre5/8Nqu3jJJ6mfe5Pdbuoyf4K+Kq7DapFskHe4w1s6F5RqmKpT9eF6jTGvPMtGYEP8/LH7z/jwWO1lyyzeiSbfcDk2g4QyOUL4bjm0OHIdaHOzvBXOtLxBKfmJ7TwPsId7v9Eyy6fVl4MCfBVnx10s76MRrssY2RrUbP/6dIjiYhBVnYdIIEe+NjpJkGeYo+ZTdqk9px2gCDcRHOh0kA/wDDtpzqadQKHlvSsSTr5cHy7nZMxTPdBUy7QjWZeN3SKi6nQ/UdipxhPFVGE4Q3bIvdBV9gr3stAnjT319Q8D+T5JRRBy6tjFi9WEDi7lr6RgpaVDVrjikla2VLLFrx1aEMNaf4rKH+gCxUo4/xJjUFXUd+QADB4SXWN451ju81rSldCBCQeqoqS615scg4udQILBHPrI+Qk6gZ0U1KspVvUCjdCMXdhWlTHlMrxzz9YxKJjbyJl4YhCzwSFqP5NkrhdCQRSt8U9+y7dSeqcxiKhsx9U1BJpgaboMV5c4DYyj8SfoZClHxa0AfiRHmi5ZF4e+3z8AAptf3S1S4EjA53P3bZk1VaKsolR2AMhDHyngA8b8ExflJCRZHA726TSr3jCN8ETEcofBzQfgWcrUql/s//q/ZbgV3cw3RxOyT0eh9ULz5TkeZm3SrkMAc9Cu4viJgs4rZw7GSndcXV1Q53iiDOlaim9E38IEU5Lkat4N5NUnd2oYXhpB791XA972ypjfwx3LL8dY7+z9O0hxn/QmP40nNstZWJzoHOKJ+EUrBStTdUNWQbcHu/sl6Igu/aRNUZWeqmC/Ls90B5CL918+d5uLmeFlsNJCJMFPnLf3mGpsnPo3f/L8ESReX3+WfOYFFkChQrkLvaxInHM g50HseA8 GA89Bef7FAnxjeor6YLWFwmwRVw3QMp54N7VaCUUVxQEOkCc24LcSbiZS2MvR3OSHdFGQS8NVmeijQOIJQg4Hyj30c/jq/QqVMVsiO/KgRm6iK/piTf3n1oZ9NcVf6W1BvvK6pWd9P/1izQuODjVJrl03AKIdrdegeajVkugEspUxb+oaCCONcoogVFupl10YVRURl8JWTWt/+l8w00uKfBrS8ZCLgphVxbq8dQeM6sd6HTo= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Fix misc bugs of DAMOS. Patch 1 makes DAMOS less stress memory allocator under extreme situation. Patches 2 and 3 fix wrong folios walking in DAMON_PADDR. Patches 4 and 5 fix wrong folios walking in DAMON_VADDR. Patches 6-8 handle extreme and unlikely memory situations that can cause divide by zero and underflow. All bugs are discovered by Sashiko. The bugs are not very critical, but better to be merged sooner than later. Since mm.git is closed for urgent changes, I aim for 7.3-rcX. I will drop the RFC tag after 7.3-rc1. Changes from RFC v1.1 - RFC v1.1: https://lore.kernel.org/20260802162631.90304-1-sj@kernel.org - Fix wrong commit message (patch 7). - Return 100% and 0% for used and free memory (patches 7 and 8). - Drop incomplete last_psi_total initialization (patch 2). - Rebase to latest mm-new. Changes from RFC - RFC: https://lore.kernel.org/20260801173554.94710-1-sj@kernel.org - Use cached pte content (patch 5 and 6). - Handle totalram < freeram case (patch 7). - Fix wrong function name in commit message (patch 9). SJ Park (8): mm/damon/core: skip applying scheme if region split for quota fails mm/damon/paddr: respect folio end for DAMOS_STAT mm/damon/paddr: respect folio end for DAMOS actions except STAT mm/damon/vaddr: respect folio end for DAMOS_STAT mm/damon/vaddr: respect folio end for DAMOS_MIGRATE_{HOT,COLD} mm/damon/core: handle extreme memory state in damon_get_node_mem_bp() mm/damon/core: handle extreme memory state in get_node_memcg_used_bp() mm/damon/core: handle extreme memory state in get_in_active_mem_bp() mm/damon/core.c | 18 ++++++++++++++++-- mm/damon/paddr.c | 8 ++++---- mm/damon/vaddr.c | 10 ++++++++-- 3 files changed, 28 insertions(+), 8 deletions(-) base-commit: 59a8d789d9478797978640a7a640b086ad400b37 -- 2.47.3