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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=T46WN0Z8; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 80536606A88A for ; Fri, 13 Nov 2026 10:22:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=T46WN0Z8 Received: by smtp.kernel.org (Postfix) with ESMTPSA id E5E071F000C6; Fri, 13 Nov 2026 10:22:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794565376; bh=jYbK8zGv/smh1139rBIQRgoOqW6RYvBzJhzngA59N4c=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=T46WN0Z8iHHHZQxDdN2GymffdKdqNuYZxD0dQwxnaw+Sma3T9vWZioz965zwmTVVC hHz8Bw6Vt/myHKlr3RfRwkMySWlEfA3VfbgevmpaW1859tNcEAPt/YWioLHEJ2ntLU vAJRgFYvQwJZoUzbOtjaFn9/hDyopzoTxwipITopJENJHGeseYnwdJ36t0hPtyd9Sq 2QepK5Qqec3CPATRuEaz93eFKW+z/MMUfQ4bfa4FuWz5y/0629x1jewhm5c5IRp5bJ fQcTOvou1Gb5r7FEeFjzzxiB0uW3jSl6xc6HdKQMS/e3w11PQQZ1THRM/akGpuDxFt XxhvuQ7XdeLXQ== Message-ID: <45a80a9e-06be-4e94-80e5-25692c4c9988@kernel.org> Date: Fri, 13 Nov 2026 11:22:50 +0100 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 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3] mm/migrate: improve mlock tracking for PTE-mapped large folios To: Wandun Chen , kas@kernel.org, hughd@google.com, akpm@linux-foundation.org Cc: ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <20261113083927.2727599-1-chenwandun1@gmail.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit On 11/13/26 09:39, Wandun Chen wrote: > From: Wandun Chen > > Commit ab521b4142aa ("mm/rmap: improve mlock tracking for large folios") > mlocks a large folio when all its pages are added in one rmap operation. > However, when a PTE-mapped large folio is migrated, remove_migration_pte() > restores PTEs individually, passing nr_pages = 1 to the rmap helpers. As a > result, PG_mlocked is not set on the destination folio. > > Reclaim can restore mlock in try_to_unmap(), but Mlocked in /proc/meminfo > remains undercounted until that scan occurs. > > Restore mlock once the full mapping has been restored in a locked VMA > under one page table lock, rather than waiting for try_to_unmap() to > restore the mlock state. > > Reviewed-by: Kiryl Shutsemau (Meta) > Signed-off-by: Wandun Chen Reviewed-by: David Hildenbrand (Arm) -- Cheers, David