From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B01A83AE191; Sun, 2 Aug 2026 16:26:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785688001; cv=none; b=UDD3cvu4xGJNJLBVzT854zDIyBEaf2uEVoR+zN+ycQUBmdheNnz7FB/D+AZvWOFIiJ1j4B0Y0Kgi8XobTfsIeemWg3Kn1Fa/ZKng4jhMeyJ2pB+IAOp+PHUng/4Jt/PYVVKRYZZ2XzI5Ep1xokzpEMikL26jwBKFtTY/evjQpi8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785688001; c=relaxed/simple; bh=IrR//9SeONznRaq+RQrnAhqX3WSUklUMTBpwTC/aRgc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=I8nVXr/DGQR+19ES10SDUHe4GF5KGQ/ATSgThNZHkoZ1DE4wMVPuj0MwvABbZa3aVeARNsM1nDgFNSSVnuD2excP/UalYzFuSHvJhCt1tkhsIrBC0AN7bkI2MawSfg9K2KuUi2zpKsYIofPRRW7E+5uy+YsFBZ6T2SJOBEbkQm0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=VpGRnd5w; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="VpGRnd5w" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 221E31F000E9; Sun, 2 Aug 2026 16:26:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785688000; bh=IGCINO/SWEhcdDZT6Rs7xP4paJCTjootNamfovWsNx8=; h=From:To:Cc:Subject:Date; b=VpGRnd5wb1TGHH2yVTvKKt7gt559B5Fsyf+0aoryOVBfpVQvbkRRyZloEG7+VC3/t gvOfMvKTT++vfALmsuCfaxj27NDqS80KSi8Bbj9AXQ1RTFr9PqhOpEg2eIkoiQkG/R uGZWNVmawo7KX28etI8LpzJQ2PATd+HrtUkoooKsMY7qxO4tlj8KeiSennLvVbnBE5 Nx+sGkyybIdweDudkhozsWjsibmtI8WOVbvt6lD/rtAjp9Iv8XCmZU9eDmkkE5Bjks +XSgL9k5DyciHPhusNV98s/J+Yl6ohfXbOF/IghMuW9SEIQ/hg1FBwPxjTqWLmWlIA QHQu7OnFJXXAw== 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 v1.1 0/9] mm/damon: fix DAMOS bugs in core, paddr and vaddr Date: Sun, 2 Aug 2026 09:26:21 -0700 Message-ID: <20260802162631.90304-1-sj@kernel.org> X-Mailer: git-send-email 2.47.3 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Fix misc bugs of DAMOS. Patch 1 make DAMOS less stress memory allocator under extreme situation. Patch 2 fixes wrong DAMOS quota auto-tuning feedback loop start point for PSI goal. Patches 3 and 4 fix wrong folios walking in DAMON_PADDR. Patches 5 and 6 fix wrong folios walking in DAMON_VADDR. Patches 7-9 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 - 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 (9): mm/damon/core: skip applying scheme if region split for quota fails mm/damon/core: initialize damos_quota_goal->last_psi_total 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 | 37 +++++++++++++++++++++++++++++++------ mm/damon/paddr.c | 8 ++++---- mm/damon/vaddr.c | 10 ++++++++-- 3 files changed, 43 insertions(+), 12 deletions(-) base-commit: 481be0db7cfd092f0aea64e65ab0a9cacff88453 -- 2.47.3