From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f42.google.com (mail-wm1-f42.google.com [209.85.128.42]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 5099A7081E for ; Wed, 8 Oct 2025 04:40:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.42 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759898402; cv=none; b=t68LCUWMTKaqCdUtl1jZfYexzdYEi850XFxvw/upNjN1uySv9A1+T9SXB0cKLkbzkS0rAjgttk1LHwOLraJYUlN990IY6g9J+q9AZ/+w+USifLATxxAAVRAxiTO+EZNoCiUx+hKjAmEf7jpHGDEVcnKrkM0dZNHVeZIwwxR6KkE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759898402; c=relaxed/simple; bh=qmHzY+IdKAe8tNe65KIgIaVUdPSdPE91QqWMQyT3RmQ=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=kqq/Jh5086R1Mp/QHtVn727jaEFa36WGw2E90Oo4nowt6nr0GEJdIn1nqaVWuAVxYX4FMJM5+Q62B+0BB16t/Qbbs++WT5bmQOQcpVxbGY3KykYNKOIGyCyz/l0r488jfiUCNwuy7ILRkjXD04kkJTuog777fjQLqAcxnfGWpb0= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=gmail.com; arc=none smtp.client-ip=209.85.128.42 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Received: by mail-wm1-f42.google.com with SMTP id 5b1f17b1804b1-46e2e6a708fso45931875e9.0 for ; Tue, 07 Oct 2025 21:40:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759898399; x=1760503199; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Mvv7sSqOor4odYLPDAZ6ntZ/NXZIV6IKoEJT47Ds+1s=; b=BigFicsZACSXkEhNc4vIAm+z9Z5aVweydf3bz0tVQh0gWQw8/G+yLoAivub3lBn+YS wJVNf3+bVXliTtabhqoMkNZA8DTDqYBFnaCit7pA3V4y9ZM9OrRKtaWH3Q6MdmYrcwyC xPy172D1sHYW6b2O0NLQqExFQZe1oYh398bLUCI+Asf8CMmVL5UWni8TuvBU1oVXQ06L 45IvpkzbAyiUTiTAyhPaw0JIkzcKL+yCMFU9VA9jBGJZEKA+XS+Q8sDIOyCo/avPfq4T zVvI+iDbovQHtCQMurVpDeAcLckivjPObOWOaAyAEQ4VFLoYKhzXeuHK3usvR8PdyL9Y qzYQ== X-Forwarded-Encrypted: i=1; AJvYcCXF0s0cH9WlE8nWBHrS8XCtc/w9JyGnS+dwQZrTiXWLgCXcL7BqotTb+zSItEMX0GcRhS5iWepTq9r+jio=@vger.kernel.org X-Gm-Message-State: AOJu0YxUQRKp0SqkLZcCyptQlJfgnar2IQhRx0z+x/Fxs3sbIuoFDhPm 0TrGFzDfWUaPKXcU0bKtREbYGp/0lQqERVg0g53WvV5VqCI6t10XMrp/ X-Gm-Gg: ASbGncsql+5JKKg7MRn134c82y1zFvzhXwD+M4KSMdR2oPW49bDyrG47cTs4glsQxPL FCo8Jm6Sn2GX0Q+AgretwkPY7cKhGp4lNR1JOaKjMblgLgLTYw678YuyJbSXg6n8XOzkorGMmRy BiHDLzFZR5R2V0+JjROMN9W5+qLVTyM4q2NkFgPYjdMKfIdPxmJe/2U9n5u+6g5RjLKGan/CA8d CI9T/RHk07JDpeYEOwIGvZ2wOJRoh25DWkQ33iatkFCsoxBruwJ2qm8UhhGgteYrl4UZosiOEdS cQU8DTNy3votYePRa4R4XY1h25kYGKzEUHcK7r4Y9XtP+r+Tv+854FlSmWTdJ08Aro0KloBEb9W hGxyU0wDjsgylYixbqBLepRAUCNs5k/5jy+5pJt0= X-Google-Smtp-Source: AGHT+IHsgqJLs4+bfAfvT/DMNOM9+GORw/CjObpAPKIew63euSQ+3GLqLlo1CMK/HKXVHgHZZ72ECQ== X-Received: by 2002:a05:6000:4202:b0:425:72b3:7368 with SMTP id ffacd0b85a97d-4266e8e6d2emr879161f8f.56.1759898398560; Tue, 07 Oct 2025 21:39:58 -0700 (PDT) Received: from localhost.localdomain ([2a09:0:1:2::30b2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8a6c49sm28159164f8f.3.2025.10.07.21.39.53 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Tue, 07 Oct 2025 21:39:58 -0700 (PDT) From: Lance Yang To: akpm@linux-foundation.org, david@redhat.com, lorenzo.stoakes@oracle.com Cc: ziy@nvidia.com, baolin.wang@linux.alibaba.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, ioworker0@gmail.com, richard.weiyang@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH mm-new v3 0/3] refactor and merge PTE scanning logic Date: Wed, 8 Oct 2025 12:37:45 +0800 Message-ID: <20251008043748.45554-1-lance.yang@linux.dev> X-Mailer: git-send-email 2.49.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Hi all, This series cleans up the almost-duplicated PTE scanning logic in the collapse path. The first one is a preparatory step that refactors both loops to use a single if-else-if-else-if chain for checking disjoint PTEs. The second one replaces VM_BUG_ON_FOLIO() with a more graceful VM_WARN_ON_FOLIO() for handling non-anonymous folios. The last one then extracts the common logic into a shared helper. Thanks, Lance --- This series applies on top of patch[1], which is based on mm-new. [1] https://lore.kernel.org/linux-mm/20251008032657.72406-1-lance.yang@linux.dev v2 -> v3: - #02 Collect Reviewed-by from Wei and Dev - thanks! - #03 Use vm_normal_folio() and drop struct page altogether (per Dev) - #03 Move the cc parameter to the end (per Dev) - https://lore.kernel.org/linux-mm/20251006144338.96519-1-lance.yang@linux.dev v1 -> v2: - #01 Update the changelog (per Dev) - #01 Collect Reviewed-by from Wei, Dev and Zi - thanks! - #03 Make more of the scanning logic common between scan_pmd() and _isolate() (per Dev) - https://lore.kernel.org/linux-mm/20251002073255.14867-1-lance.yang@linux.dev Lance Yang (3): mm/khugepaged: optimize PTE scanning with if-else-if-else-if chain mm/khugepaged: use VM_WARN_ON_FOLIO instead of VM_BUG_ON_FOLIO for non-anon folios mm/khugepaged: merge PTE scanning logic into a new helper mm/khugepaged.c | 242 ++++++++++++++++++++++++++---------------------- 1 file changed, 130 insertions(+), 112 deletions(-) -- 2.49.0