From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7EEDCE81BD3 for ; Mon, 9 Feb 2026 15:31:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=WvjH4te4K5QrtEX1LrPlb0ORwoSqRJGo6cXSgpf/Q4A=; b=WEYn16hkA67UtUc0gNvibwbpvW d46qMFFdaAv+pGMkH9axGlwqJMOmSSIwnu4rJ2TadfpUnrIJhJ3ZDvFAXK49JupdjawuZxiZnhjTf JjmhmCtBy2uGptoG/7gBKcjJGLIbR1XhVvlQ7hboe3NcKGUywAO23zcs9n1rqwMIaWaRSkri+5xPR Hb3cscM7WP+cAZdoyKv+IjPJwuXE8q5bT4SswGDpd2D2XnKcLJCe56FNAZ2xNcFl5e3V0ujpEZool rzEJHFVMyMtl9K5mcnl10HWl48257bZ5VXgpfY/zD208PwyyIryhoEeXm/9ZlDdX7dzvZpDpE/MFo bL8ol0+A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1vpTET-0000000Fc4k-3vQe; Mon, 09 Feb 2026 15:31:25 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1vpTES-0000000Fc4F-0d2J for linux-arm-kernel@lists.infradead.org; Mon, 09 Feb 2026 15:31:24 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by tor.source.kernel.org (Postfix) with ESMTP id 39CA060008; Mon, 9 Feb 2026 15:31:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CA6D7C116C6; Mon, 9 Feb 2026 15:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1770651082; bh=RxzDyEjlTagEAtrPHYYasNPmARDPY4JPQgRHJpvLkVk=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=mZ3eeO11D/oUQS5v/btfeH+KWSUiDv716YAlCn9LG2lty+rSDU7bVaDkiy2gsYbOc tb7t9bCUReDJg0aSKPdg6GDM4sIKmfN3JmSszRhtnEwwYou3j81zWwrsUVmezU6QZG 9lVKlgakyr7WUWz+DNZB5R+9i9S3OHB3jUaWsdDowDqUv6/EISKW7HFFbAjnqwEe6d X6oDyTDHUz3gfJpDZJzPwXA+IUFh77CV8pnlEySdq5U8dreLDebPt+iHr6SKMtMcBK yKjq8uYdG03BfvkCR8MGJTmcaCExoQ02SlTgoH98wSKLPMUxTLTm2XyNs2nDcHEpE0 QTAqgbBxufOHA== Message-ID: <9b7afb6a-b709-4b42-a4dc-fa12c2ca624c@kernel.org> Date: Mon, 9 Feb 2026 16:31:13 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v6 5/5] mm: rmap: support batched unmapping for file large folios To: Baolin Wang , akpm@linux-foundation.org, catalin.marinas@arm.com, will@kernel.org Cc: lorenzo.stoakes@oracle.com, ryan.roberts@arm.com, Liam.Howlett@oracle.com, vbabka@suse.cz, rppt@kernel.org, surenb@google.com, mhocko@suse.com, riel@surriel.com, harry.yoo@oracle.com, jannh@google.com, willy@infradead.org, baohua@kernel.org, dev.jain@arm.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org References: From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/9/26 15:07, Baolin Wang wrote: > Similar to folio_referenced_one(), we can apply batched unmapping for file > large folios to optimize the performance of file folios reclamation. > > Barry previously implemented batched unmapping for lazyfree anonymous large > folios[1] and did not further optimize anonymous large folios or file-backed > large folios at that stage. As for file-backed large folios, the batched > unmapping support is relatively straightforward, as we only need to clear > the consecutive (present) PTE entries for file-backed large folios. > > Note that it's not ready to support batched unmapping for uffd case, so > let's still fallback to per-page unmapping for the uffd case. > > Performance testing: > Allocate 10G clean file-backed folios by mmap() in a memory cgroup, and try to > reclaim 8G file-backed folios via the memory.reclaim interface. I can observe > 75% performance improvement on my Arm64 32-core server (and 50%+ improvement > on my X86 machine) with this patch. > > W/o patch: > real 0m1.018s > user 0m0.000s > sys 0m1.018s > > W/ patch: > real 0m0.249s > user 0m0.000s > sys 0m0.249s > > [1] https://lore.kernel.org/all/20250214093015.51024-4-21cnbao@gmail.com/T/#u > Reviewed-by: Ryan Roberts > Acked-by: Barry Song > Reviewed-by: Harry Yoo > Signed-off-by: Baolin Wang Acked-by: David Hildenbrand (Arm) -- Cheers, David