From patchwork Wed Mar 29 01:17:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zi Yan X-Patchwork-Id: 13191795 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6CB90C6FD18 for ; Wed, 29 Mar 2023 01:17:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229519AbjC2BRh (ORCPT ); Tue, 28 Mar 2023 21:17:37 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56284 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229479AbjC2BRg (ORCPT ); Tue, 28 Mar 2023 21:17:36 -0400 Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13C0CC1; Tue, 28 Mar 2023 18:17:35 -0700 (PDT) Received: from compute2.internal (compute2.nyi.internal [10.202.2.46]) by mailout.nyi.internal (Postfix) with ESMTP id 74DA75C00B2; Tue, 28 Mar 2023 21:17:34 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute2.internal (MEProxy); Tue, 28 Mar 2023 21:17:34 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sent.com; h=cc :cc:content-transfer-encoding:content-type:date:date:from:from :in-reply-to:message-id:mime-version:reply-to:reply-to:sender :subject:subject:to:to; s=fm2; t=1680052654; x=1680139054; bh=JI hj9np4mbbgqAGn5v0t2MJdvOZp0Xk+M5zFinazxgw=; b=Y75fKkXMy8AqDoNb1z WUxKUuoEatALeZNXp3NsVv9yNgvzcF4Dwo7X87U2OqlWnb4jarG/ZQrNHEeHulG9 AZEzLYY+mpAqDBUnzhQagPB+bwAua8pZxwUonO26ma6Szwfiv4Lqw2iG2Snj5V6b 3FESEK32JezQ6q6lWR5ZAoT96o+key82qGItVNY2Rcq227zzRdiwq7vHasKZWkEK J3qB5/+O9yYWoiqmk8Af5HV3Ndjq4Z1aASr5haenQJtyZbwJQn76+UANw7qSHWvb XYR9VzwM1iH8TrnhYlCjRusDvSfcRUjXlM1K0TlGBqVrrCRUT3Hv/RAgi0USIlus SNfQ== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:cc:content-transfer-encoding :content-type:date:date:feedback-id:feedback-id:from:from :in-reply-to:message-id:mime-version:reply-to:reply-to:sender :subject:subject:to:to:x-me-proxy:x-me-proxy:x-me-sender :x-me-sender:x-sasl-enc; s=fm2; t=1680052654; x=1680139054; bh=J Ihj9np4mbbgqAGn5v0t2MJdvOZp0Xk+M5zFinazxgw=; b=dnFIZgno8DAeHWb8t QVevHEkRVdHPNRmSjtBeYGtD7S351lY8WeeJN0r6RHnS8mkiBDdUT3HKiszdUXA4 OCI8scZQx+lBJ1c+RCrGPrQEHUDUmo9vNbJ7A7eF3fofFxITUdH27acBpZTCqvBT ERU3A94thqIT7v89E1mBi8iVh3l2X43z2vbZTDk7fVTaWZfB8u826nTmmy23P+sZ L2E8WCaXnxwv1ezA/HWZm6CE7LhQbFVWYEZbH2kXVRztHAUFOGkZrXy/rtbRWHXN /mhVySczaKYMuC92TF7rZD6C6H9g7HE+C8zCWCJFQn7AZ0HAUn7KHd/Ot1FZ+ldQ tXMmA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrvdehhedggeehucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhephffvvefufffkofhrggfgsedtqhertdertddtnecuhfhrohhmpegkihcujggr nhcuoeiiihdrhigrnhesshgvnhhtrdgtohhmqeenucggtffrrghtthgvrhhnpedvieeutd ehtddthfegveekueevfedvueehjeeltdevgfejteekudfgvdelveekffenucffohhmrghi nhepkhgvrhhnvghlrdhorhhgnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpe hmrghilhhfrhhomhepiihirdihrghnsehsvghnthdrtghomh X-ME-Proxy: Feedback-ID: iccd040f4:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Tue, 28 Mar 2023 21:17:33 -0400 (EDT) From: Zi Yan To: "Matthew Wilcox (Oracle)" , Yang Shi , Yu Zhao , linux-mm@kvack.org Cc: Zi Yan , "Kirill A . Shutemov" , Ryan Roberts , =?utf-8?q?Michal_Koutn=C3=BD?= , Roman Gushchin , "Zach O'Keefe" , Andrew Morton , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v2 0/7] Split a folio to any lower order folios Date: Tue, 28 Mar 2023 21:17:05 -0400 Message-Id: <20230329011712.3242298-1-zi.yan@sent.com> X-Mailer: git-send-email 2.39.2 Reply-To: Zi Yan MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org From: Zi Yan Hi all, File folio supports any order and people would like to support flexible orders for anonymous folio[1] too. Currently, split_huge_page() only splits a huge page to order-0 pages, but splitting to orders higher than 0 is also useful. This patchset adds support for splitting a huge page to any lower order pages and uses it during folio truncate operations. The patchset is on top of mm-everything-2023-03-27-21-20. Changelog from v1 === 1. Changed split_page_memcg() and split_page_owner() parameter to use order 2. Used folio_test_pmd_mappable() in place of the equivalent code Details === * Patch 1 changes split_page_memcg() to use order instead of nr_pages * Patch 2 changes split_page_owner() to use order instead of nr_pages * Patch 3 and 4 add new_order parameter split_page_memcg() and split_page_owner() and prepare for upcoming changes. * Patch 5 adds split_huge_page_to_list_to_order() to split a huge page to any lower order. The original split_huge_page_to_list() calls split_huge_page_to_list_to_order() with new_order = 0. * Patch 6 uses split_huge_page_to_list_to_order() in large pagecache folio truncation instead of split the large folio all the way down to order-0. * Patch 7 adds a test API to debugfs and test cases in split_huge_page_test selftests. Comments and/or suggestions are welcome. [1] https://lore.kernel.org/linux-mm/Y%2FblF0GIunm+pRIC@casper.infradead.org/ Zi Yan (7): mm/memcg: use order instead of nr in split_page_memcg() mm/page_owner: use order instead of nr in split_page_owner() mm: memcg: make memcg huge page split support any order split. mm: page_owner: add support for splitting to any order in split page_owner. mm: thp: split huge page to any lower order pages. mm: truncate: split huge page cache page to a non-zero order if possible. mm: huge_memory: enable debugfs to split huge pages to any order. include/linux/huge_mm.h | 10 +- include/linux/memcontrol.h | 4 +- include/linux/page_owner.h | 10 +- mm/huge_memory.c | 137 ++++++++--- mm/memcontrol.c | 10 +- mm/page_alloc.c | 8 +- mm/page_owner.c | 10 +- mm/truncate.c | 21 +- .../selftests/mm/split_huge_page_test.c | 225 +++++++++++++++++- 9 files changed, 366 insertions(+), 69 deletions(-)