From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=95.215.58.136 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1794397155; b=whCR1zPhC4i7r5jmew/lO8yCe08FVvcYoLHOr90EiWQmF/gOcOdknUryRz2yvi8QD3mg WYsPhcJOhdRydb4LGFcD9bnm8Q0TXl8aBa9LkVIinPmgf2fpLfAAZeYFADNIzPAAxD0xG gBjYYWcGjPmnh6VSY8oOdABDbOL/IDbX+7I82N/t0h8CQwCain7CXjo4qh/Y7iQ60aUYu ngXgDFoaukAKK/5sr4dUykV9FGrEz0t3vP6yyzUM6cX/up27V5/nQ4yo5j94VQAh4xewt XaMEiddDv+HuUwTFu5vUFCpY+W4GWfcmMiNwHOhNgKdGDEWe/AUWN7q+iT6RRrWQWFg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1794397155; h=DMARC-Filter:X-Envelope-To:DKIM-Signature:X-Envelope-To:Received: X-Mizu-Trace-ID:X-Migadu-Flow:From:To:Cc:Subject:Date:Message-ID: X-Mailer:MIME-Version:Content-Transfer-Encoding; bh=sm9PXJr5TIiyZl5zOIT5PuR1aDglg76Y9OqldJz8H9E=; b=h2txOat5WVnpsVBSrwsZB36bvfXRrRFejjkSnfceLokRBNdNKHYnD3FzN0ZnlvWz9U5c OXGfsf+xZdeLw08xXlT17XA7S7A9VUcngpymK3wKMC0ElbAFCBEzhZKybmoqHbBPG8Lki Aik9OkqW83bsvDJj7pPqnCexezUrIIYbgpymx3ME28B/93AqvweTnRzTafrxIheHT1DwV 00aUN3eNLRr3EX8ESa72jufogOHLpRRv2HqHplIG3OicbVQVPFkXRAwC1pHujwk/gbGpo VbZxCvjj2z5rgJZCgjeHHDQML3wr6ObUz89IqByqNUbN+MEBrDWBsWp5LasjaDdWSEA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b="i0Eu/+F3"; arc=none smtp.remote-ip=95.215.58.136 Received: from mta1.migadu.com (out-136.mta1.migadu.com [95.215.58.136]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D6CC0606A324 for ; Wed, 11 Nov 2026 11:39:13 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.2 smtp.subspace.kernel.org D6CC0606A324 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linux.dev header.i=@linux.dev header.a=rsa-sha256 header.s=key1 header.b=i0Eu/+F3 X-Envelope-To: linux-kernel@vger.kernel.org DKIM-Signature: a=rsa-sha256; bh=4Mq5z6I5/MSe2xUzwOBENm+Vhd7unCO4r5C+7Fe1rDA=; c=simple/simple; d=linux.dev; h=from:to:subject:date:message-id:mime-version:content-type; s=key1; t=1794397151; v=1; x=1795001951; b=i0Eu/+F3b/9EIe3orqhl3IDtDiqj4w5mYalWC3I9BI2zzPkKVtmddwZ2out4xDtscItFvv4Z zw1nVFvdEnGmaBICuCkqy+b/02u54VlQdV1xPlQBGtCfHJA+z+BLwF0Smp5dKKDBTxDw9iHv6Ua wc4mCiMli/81WCRU8/mACUy4= X-Envelope-To: linux-kernel@vger.kernel.org Received: by mta10.migadu.com with ESMTPS id 48df2cab8c88d833; Wed, 11 Nov 2026 11:39:11 +0000 X-Mizu-Trace-ID: 48df2cab8c88d833 X-Migadu-Flow: FLOW_OUT From: Usama Arif To: Andrew Morton , apopple@nvidia.com, byungchul@sk.com, david@kernel.org, gourry@gourry.net, jannh@google.com, joshua.hahnjy@gmail.com, liam@infradead.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, ljs@kernel.org, matthew.brost@intel.com, mhocko@suse.com, pfalcato@suse.de, rppt@kernel.org, surenb@google.com, vbabka@kernel.org, ying.huang@linux.alibaba.com, ziy@nvidia.com, kas@kernel.org, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, kernel-team@meta.com, baolin.wang@linux.alibaba.com, Nico Pache , ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, lance.yang@linux.dev Cc: Usama Arif Subject: [PATCH 0/3] mm: fixes for THP migration, swap-in and device-private smaps Date: Wed, 11 Nov 2026 03:38:28 -0800 Message-ID: <20261111113904.650722-1-usama.arif@linux.dev> X-Mailer: git-send-email 2.53.0 X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This series contains three fixes for existing THP migration, PTE swap-in and smaps paths. They were extracted from the work on PMD swap entries for anonymous THPs [1] and can be merged independently. Sending this separately as requested by Andrew (should have sent them separately anyways, my bad). 1. Avoid a folio reference leak when concurrent MADV_DONTNEED clears or splits a migration PMD before the device migration split helper acquires the PMD lock. 2. Prevent PTE swap-in batching from mapping poisoned subpages of a large swap-cache folio. Include the subpage scan helper with this fix so it can be applied on its own. 3. Account device-private PMDs using mapcounts in smaps, matching the PTE path. Shared mappings get proportional PSS, and exclusive mappings are counted as private. [1] PMD-level swap entries for anonymous THPs: https://lore.kernel.org/r/20261002095503.3585565-1-usama.arif@linux.dev/ Usama Arif (3): mm: don't PTE-batch a swap-in over a hardware-poisoned subpage fs/proc/task_mmu: don't read young/dirty from a non-present PMD in smaps fs/proc/task_mmu: account device-private PMDs as present in smaps fs/proc/task_mmu.c | 12 ++++++++---- mm/internal.h | 15 +++++++++++++++ mm/memory.c | 4 ++++ 3 files changed, 27 insertions(+), 4 deletions(-) -- 2.53.0-Meta