From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-wm1-f43.google.com (mail-wm1-f43.google.com [209.85.128.43]) (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 A5E1E34BA3B for ; Mon, 6 Oct 2025 14:45:48 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.43 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759761950; cv=none; b=WkN+Hhw2wLACb2gocyfaGaJX7AvV9fv7gPL3NyxMRDz6HfOqwD7sY7oCaALir+ED+rHOxwmJkmL9OXSOlZhLN+a2dLOzaZqxmiJ3A4GTagrvvgQ4/BQpPOsLQxNjKAzhTUYIRssNJYN3MEptd/jw1mP5EsfFydIHJiPeDHvrTzs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759761950; c=relaxed/simple; bh=1cWLkjQBIyzBO9VwDTj/MknGMn1ZpDGxL/Euov0VlYw=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=DwI8BAWxhIH4K42ONb0+Zndy1KnFDOB9KhEgGq4xmm2PSZ115o432ZyuGLG8Q4KT0QIWPW5YkZmJd7DYlKBXg4lnoj2WXKbLcSf2f50+Ryrub8mi0HjQaYUdiA874FVc5U4hY3JM+8lrJAsWq8NlOnvGoP6IsIBYoebWvEndaBc= 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=209.85.128.43 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-f43.google.com with SMTP id 5b1f17b1804b1-46e6c8bc46eso32649795e9.3 for ; Mon, 06 Oct 2025 07:45:48 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759761947; x=1760366747; 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=mbi97d0rrEhXFPx9xb8HNtK7TcQbHRpYHFxMYmusqFU=; b=nXnZWhY+AoJbZ1L6iU3LMBGbd2pbyM9S6iHJLjD09EHIqLGO1hxhsfEl7r1pq11A6C AuY/qtwJXcRgtQz3S7UeTHqY9liRi1mOZd3wFFQHmhYBjBXT1bjV2pVazJny+U3UZIfN l9fcMQ3AaAuUXhg/NNdj8bOBevkLs0t6QaKGL6wggHvHffHG///Zrfxa0YfhnbGk7uvM eCug3f49gde87jbcCZH3GBD6ZZUEJc+uDeXTnN76nx6CK7nlKt4YthnXgO6igFj8Bs8Q +qajpgpt3DvcjJrNRonCCsJer8a26raApkd1CLxCzIsRKdFujNkA27M01g4gVJscKn30 Q+nA== X-Forwarded-Encrypted: i=1; AJvYcCWXVUzLOVUxt+jAOyAzsHdP02P6mm1Mf6M8NkhjHq68QPQHGoSEnDjz7d5fw6FK6dkd59sFaT/5NkEmpHw=@vger.kernel.org X-Gm-Message-State: AOJu0YxaoSQlAu3pL4hUflUixrPSgYnKkIqWoi62r8qVhgIYnGo20mZm dfDSg+drUtWK7qGp3rC0x+L8pqswcanb1e4iNi/RQD74QDPgiAES9W7g X-Gm-Gg: ASbGncu9mTG4D4YXcEMjmSu693KmxtYqEo0pwcoo+BaozCZd8/MM2gnZtJir3MIWBVY K+7om8Gf/X5vP4zcZ6v6B5/ofgK6RYEkkwh1vSSnmwjJfcpvpKky2UmyJizqcGGkaY4+cRonJtI DmWq61r32xy5g3IM4gbDrukj10BoISi1ooabIP/wFBDR4cMtPEk/DVcQ7pLJPcz1w705IwkWVUB yysWutJsCT8ko88h7pDCbVnWFrvpUlx1eSSF4SnKQuezMrRZLLoIDkPaRQ3NpJJ+VUy3Myf4/Qq u1NXV18AgpoLD2jqQlLeUA5dtpuzvpEWwDchwfXQJBhSTXyPuUBv2WHX33txmnULInEaUtDPFUT PHpxp20GSyo4d4wB99tt2e5ATY3GKRmzqDP/T3iCpOtCVfABbWA== X-Google-Smtp-Source: AGHT+IGSXg4krW88X25pKMdWNSxrnvZTh6Q/uva3k1hELeEzxn4ObqIjdy8xV6ZqzGYl24DrHHt6Xw== X-Received: by 2002:a05:6000:2407:b0:3e4:5717:368e with SMTP id ffacd0b85a97d-4256712a5d1mr8126669f8f.2.1759761946831; Mon, 06 Oct 2025 07:45:46 -0700 (PDT) Received: from localhost.localdomain ([2a09:0:1:2::301b]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-4255d8ab8b0sm21242624f8f.18.2025.10.06.07.45.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Mon, 06 Oct 2025 07:45:46 -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 v2 0/3] mm/khugepaged: refactor and merge PTE scanning logic Date: Mon, 6 Oct 2025 22:43:35 +0800 Message-ID: <20251006144338.96519-1-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 --- 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 | 243 ++++++++++++++++++++++++++---------------------- 1 file changed, 131 insertions(+), 112 deletions(-) -- 2.49.0