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b=L/r6dn9EC67/opcBAX3umt9W1+djaQGCUF+kuSFFcp+2TcORzFbd3Z0bc0Vpi9NUU s2R3ApF90dBL5shgUoExIvYWPnHHqUSRe39mTY4F9izZh6dLeC3dkpVlOhxWSYfqnL n2IotXA3GxaCr+FYyJ/Bv65wxb1tJo+wjwLKXCNil+YGkBW1NabNNU+6z9914M/TUL vv84Kn0t4Xvkz8j3e8fK4xMPCHcRjWSotZh+0GC8oP4SpJS/YJ8+JXlfkBv2caLIqZ M+Xl1lD5wCcKJt8rh0R0WdwZpgPazAsT8TbAFqqNC8QIk3FT6l/S5n2eiw4flNhTbV lt+SnTUybEVvg== From: SJ Park To: Andrew Morton Cc: SJ Park , stable@vger.kernel.org, Usama Arif , Yueyang Pan , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 0/8] mm/damon: fix DAMOS bugs in core, paddr and vaddr Date: Tue, 1 Sep 2026 06:18:41 -0700 Message-ID: <20260901131850.98037-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 39F5E1A0008 X-Stat-Signature: c5m7ojyhyox85ni8djwhimm9yuzszcww X-HE-Tag: 1788268739-566970 X-HE-Meta: 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 RdFPJkEv mtaX08MvHbGifngB1A61KYAp4KVB21NIujNAR0zaEQk7yOJtrY1ghx8x/nFGVYhIF6yxbylFiy8g0hNGWxKD8S9Axsh8SiQUl3xrS35TrfCUiG/MfyKF6wg0caZg3KCIUBsDUzPfyilwHGVP5fLC9PNeSNAhvambnfquehNlWMu6eLLVHSFJUBLjbqHaQWpULLRQkZMiiqx9rSDFdCyY+tTt35BVBos5wC5YzlnurLExOdAc= 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 v1.2 - RFC v1.2: https://lore.kernel.org/20260831140254.72004-1-sj@kernel.org - Drop RFC tag. - Rebase to latest mm-new. 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: 0926ef526f90a707f59c0790cafdb5a9b9cdebe7 -- 2.47.3