From patchwork Mon Apr 3 20:18:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zi Yan X-Patchwork-Id: 13198700 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 28B07C77B62 for ; Mon, 3 Apr 2023 20:19:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232206AbjDCUTI (ORCPT ); Mon, 3 Apr 2023 16:19:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54934 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229446AbjDCUTH (ORCPT ); Mon, 3 Apr 2023 16:19:07 -0400 Received: from out3-smtp.messagingengine.com (out3-smtp.messagingengine.com [66.111.4.27]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8913F3586; Mon, 3 Apr 2023 13:19:06 -0700 (PDT) Received: from compute5.internal (compute5.nyi.internal [10.202.2.45]) by mailout.nyi.internal (Postfix) with ESMTP id 3E05D5C0081; Mon, 3 Apr 2023 16:19:03 -0400 (EDT) Received: from mailfrontend1 ([10.202.2.162]) by compute5.internal (MEProxy); Mon, 03 Apr 2023 16:19:03 -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=1680553143; x=1680639543; bh=Pt E34Mi5e7fcyqY/yn1ZOTjs4FeBAcshGnyuLTQZvAU=; b=B9s/caMaukwcV+M6dZ kL9rfGdE67qmnEh6DZ+AUJ55B1lwYnKkiaFZvFvxWifT6Qeb1s+1Qzsdmuhybud9 yEJBjwhl17/yloWHzzlfAv0RE9u/jJDvDsBPxlC3V/+RtFzChmK/Iew9OQXh+BnW vTvWyK6zGm2BkJ3cYwL/+pUM0bq2Q/612wWE9WO7Y8w7gx1bxVRfySjBY8ffm+2S ouTUAk1Df/BVj5cSdbAM3AJY67x4h7boC1NsLkdywmHS5e/oU/GBeCPrrA795zDu mVP7OA8dK3cDuGuXOCDx9ca+E4uiXThMzuwRIeF+5edpSmRg7vFYqsxfu4jyB/j7 HY4A== 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=1680553143; x=1680639543; bh=P tE34Mi5e7fcyqY/yn1ZOTjs4FeBAcshGnyuLTQZvAU=; b=hdQl9dH6VQ/26IqYX DLyWdDnhElnsE5R5dMTtqP9vEPsjctti3fMutSNYYpRDF6z4WAhpyOlLdqQR/y5Z xko0rDzCgzEgEh/VJwcwic9W9BvKECkYWUtgNXga7PhLmmQUFPmi0LC5kx6zvKlX 1q18Xnd7DIGG0EupwueU/TfD14QpewPnBuxdDStvScTEMTYwylClaaoqhqvvJ/o2 9rLR0o+Q1ksTidiE0O+b+/7jCIzNyYaI/CLOfG5Gt6AJaT+HqXYBkhxzxzPOSGrU gE+Kd3Bjs59c9LjTGyD/ArDHxMJ9XS4JJwvMONKrytkBORXYOG7b4UYyTpZGs09T c9qqA== X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvhedrvdeijedgudegkecutefuodetggdotefrod ftvfcurfhrohhfihhlvgemucfhrghsthforghilhdpqfgfvfdpuffrtefokffrpgfnqfgh necuuegrihhlohhuthemuceftddtnecusecvtfgvtghiphhivghnthhsucdlqddutddtmd enucfjughrpefhvfevufffkfforhgggfestdhqredtredttdenucfhrhhomhepkghiucgj rghnuceoiihirdihrghnsehsvghnthdrtghomheqnecuggftrfgrthhtvghrnhepvdeiue dthedttdfhgeevkeeuveefvdeuheejledtvefgjeetkedugfdvleevkeffnecuffhomhgr ihhnpehkvghrnhgvlhdrohhrghenucevlhhushhtvghrufhiiigvpedtnecurfgrrhgrmh epmhgrihhlfhhrohhmpeiiihdrhigrnhesshgvnhhtrdgtohhm X-ME-Proxy: Feedback-ID: iccd040f4:Fastmail Received: by mail.messagingengine.com (Postfix) with ESMTPA; Mon, 3 Apr 2023 16:19:02 -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 v3 0/7] Split a folio to any lower order folios Date: Mon, 3 Apr 2023 16:18:32 -0400 Message-Id: <20230403201839.4097845-1-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 file folio truncate operations. The patchset is on top of mm-everything-2023-03-27-21-20. Changelog === Since v2 --- 1. Fixed an issue in __split_page_owner() introduced during my rebase Since 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 | 8 +- mm/truncate.c | 21 +- .../selftests/mm/split_huge_page_test.c | 225 +++++++++++++++++- 9 files changed, 365 insertions(+), 68 deletions(-)