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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id D48F4C83F05 for ; Fri, 4 Jul 2025 10:26:39 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3E5026B8033; Fri, 4 Jul 2025 06:26:30 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 396836B800A; Fri, 4 Jul 2025 06:26:30 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 25DCC6B8033; Fri, 4 Jul 2025 06:26:30 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id 0F3ED6B800A for ; Fri, 4 Jul 2025 06:26:30 -0400 (EDT) Received: from smtpin06.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay08.hostedemail.com (Postfix) with ESMTP id DC292140283 for ; Fri, 4 Jul 2025 10:26:29 +0000 (UTC) X-FDA: 83626202898.06.1660103 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf21.hostedemail.com (Postfix) with ESMTP id DEAEB1C0003 for ; Fri, 4 Jul 2025 10:26:27 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UzStHXPt; spf=pass (imf21.hostedemail.com: domain of dhildenb@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhildenb@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1751624787; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=QHTcY4lGBgipsSfC0DkPJInFiJB34Dm8315TxjfyzWo=; b=Js7P+04TBpmLaMJISDekA2uSPaMfK0us7N1AjyBNWUg/DzaGLuo+UGwfc3iVE9slgyMhUy P04lwh1v/RD7MPuxDqkmaOSxHN3NCcczbCHhywKMrRhXGZr4p1D/qw5APiHN+AMcTSsfLx 4AHYqa2aAiY6keJrmN6uWyrXCzAa4nQ= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=UzStHXPt; spf=pass (imf21.hostedemail.com: domain of dhildenb@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=dhildenb@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1751624787; a=rsa-sha256; cv=none; b=ZJ+L95xN1586bQorHtQGZ9u+VcoqYg/tX8cyf+RTXE9r22uHEickSWTTHeAKOz1dRF5DZt a9aAf0mjVf8Q2MofbzNNJgdlnTprPT7T7Rva5tbSP0pDwhSIgajzA86Plws5YMij7DBuMp RzWm1nwk5CiWGJmr4PG5xrb0qVp4CrU= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1751624787; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=QHTcY4lGBgipsSfC0DkPJInFiJB34Dm8315TxjfyzWo=; b=UzStHXPtfwQ4iEgdiBbI2uSlQ/JFf9wO486GRHfQ8veT62JksTFytwAVgfl+x+IE91YWwl byEdrPURBsOH7uro+8jaiU5Q53obtD/2qzi+TOe2zLu1Z+PJ41CkcrOoBZdUOPdZfFVCP8 ZY5IUHSs4G1GrUxSdQk+wErFP/P3mv8= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-108-Uu5vVE5iPb-yAKHl1HxGdg-1; Fri, 04 Jul 2025 06:26:25 -0400 X-MC-Unique: Uu5vVE5iPb-yAKHl1HxGdg-1 X-Mimecast-MFC-AGG-ID: Uu5vVE5iPb-yAKHl1HxGdg_1751624784 Received: by mail-wm1-f70.google.com with SMTP id 5b1f17b1804b1-450d6768d4dso4077005e9.2 for ; Fri, 04 Jul 2025 03:26:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1751624784; x=1752229584; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=QHTcY4lGBgipsSfC0DkPJInFiJB34Dm8315TxjfyzWo=; b=ut1nz0jxOQE+79Q9yZQ83Oan9OBsmzoJqZ/19+7EaWTwT1t3SxJ/JiBywgyvSVOAzq mcKvqeNQ1MOqrpHFSoU2V+I2/822/uJgSvSYlx4A2YbYD3vqdg/zQ+yf1XXabhlB8MU0 iNZhGpjyMlTjAag2cD+PqP7eigW0y8hNTHp8J/zANCeY2/RLOWyQCmrCunc8VlQrUXlo xTFrzN8aSksdZENLzUDBkQ+S3DgIkwFvLQ+DS4IgIVrKQmrVpTC3SFA4RFCDziMj+9KS mjkewhrCdSK9sxWsv7S5cDxMwzd8wGV/cH7Rl9Rtnhlz5tY5WrHQUCdh8l7IArAkAW2o y0ig== X-Gm-Message-State: AOJu0YwpLebg/moGAra1yOLLkntn32RzUmqbBgmMIHmB81f1azDf7KDg RGsMufcE5geTpTuVDuQiDU/vD9ot3FqfYBuZtmT85EBfr/9uci/F5POi0cCRS9L4pENC/SQTYC+ Gp2rmRLHn5zSkNZbtjs1HsWkeg4CR8BJuHGJgmnqaW7J/uSdZdw4I X-Gm-Gg: ASbGncuy8M5LvuHcMn/pxFMxtbUJ1S9jodXDg+GR+E9O6W94xseVtCHNfqbmtRSAdY5 aLh8cNVWJ9KIUOxywmM9qsYIN6eIwl7cYHb+ypcYNikcqMVWnEY0aBlDrMtK1fusRqemO4IqaaB 8ygwwC9hf2rBSMpa4UjrD66svv5x2EJUDV/sLBnMqkGxNQlA8MAJq6O7aSGYLz/tQQuhFH9X8Vu jMea5oaCpzVGCkJ0ltKxfBOwFLZbQ5hl7TT1boygY/7QzBOEsGsN1wrRUy3pdhvbMftE1WSdIWN eld6sjxGTKpdEYCQ2LC2kWzM/Y5zXmz0Z1GJja7HpUYIjQ/R3ZmHBAFcHPOlkev+PI2heRzUdAY DmWuLpA== X-Received: by 2002:a05:6000:4383:b0:3a0:b84d:60cc with SMTP id ffacd0b85a97d-3b4964bbb0emr1665039f8f.2.1751624783746; Fri, 04 Jul 2025 03:26:23 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFo0T/pNI/Of6mHqiHSOPVoLeJ7bI5rRnJeuA800PIc1+OxXRdj+3LOyAd04sXSWw3NJAHS6g== X-Received: by 2002:a05:6000:4383:b0:3a0:b84d:60cc with SMTP id ffacd0b85a97d-3b4964bbb0emr1664957f8f.2.1751624783096; Fri, 04 Jul 2025 03:26:23 -0700 (PDT) Received: from localhost (p200300d82f2c5500098823f9faa07232.dip0.t-ipconnect.de. [2003:d8:2f2c:5500:988:23f9:faa0:7232]) by smtp.gmail.com with UTF8SMTPSA id ffacd0b85a97d-3b47030cdf5sm2101401f8f.1.2025.07.04.03.26.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 04 Jul 2025 03:26:22 -0700 (PDT) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, linux-doc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, virtualization@lists.linux.dev, linux-fsdevel@vger.kernel.org, David Hildenbrand , Andrew Morton , Jonathan Corbet , Madhavan Srinivasan , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Jerrin Shaji George , Arnd Bergmann , Greg Kroah-Hartman , "Michael S. Tsirkin" , Jason Wang , Xuan Zhuo , =?UTF-8?q?Eugenio=20P=C3=A9rez?= , Alexander Viro , Christian Brauner , Jan Kara , Zi Yan , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , "Matthew Wilcox (Oracle)" , Minchan Kim , Sergey Senozhatsky , Brendan Jackman , Johannes Weiner , Jason Gunthorpe , John Hubbard , Peter Xu , Xu Xin , Chengming Zhou , Miaohe Lin , Naoya Horiguchi , Oscar Salvador , Rik van Riel , Harry Yoo , Qi Zheng , Shakeel Butt Subject: [PATCH v2 19/29] mm: stop storing migration_ops in page->mapping Date: Fri, 4 Jul 2025 12:25:13 +0200 Message-ID: <20250704102524.326966-20-david@redhat.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250704102524.326966-1-david@redhat.com> References: <20250704102524.326966-1-david@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: iCisv-abIp7jEAlxoZHlQN3AR0t_gaaWbjoI6IrnBxo_1751624784 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: DEAEB1C0003 X-Stat-Signature: yw9nxfx37ngdakukc3yez5pjjctgw844 X-Rspam-User: X-Rspamd-Server: rspam05 X-HE-Tag: 1751624787-156230 X-HE-Meta: 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 n4RoAfK9 I5lpG10BQNE5hVWowrHbQ1kc4sVB/3IGPrHczky4HME3hT8Pchfbik5KtsdjsFFRERMLk+kfuinaogCAGgR0oFoXrbTXeg6h32pU8fglIfsfCF3TqE77VbbG1EbumHrM6qUu0l0zmXR9N+vSPB7raRtQe0uS1CtWF3UImCCQmvoGW9/GCkXaXScfZbRyVHwG8J7zfABscxVJhDxhp9yQxae2AN85TwaovHy3wRTr0zaUhVKyGNmFXtVNhWfNaoqmHSsuaEq1HVVNhxj0lRsXari1ve56bnHbTSHh6 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: ... instead, look them up statically based on the page type. Maybe in the future we want a registration interface? At least for now, it can be easily handled using the two page types that actually support page migration. The remaining usage of page->mapping is to flag such pages as actually being movable (having movable_ops), which we will change next. Reviewed-by: Zi Yan Reviewed-by: Lorenzo Stoakes Reviewed-by: Harry Yoo Signed-off-by: David Hildenbrand --- include/linux/balloon_compaction.h | 2 +- include/linux/migrate.h | 14 ++------------ include/linux/zsmalloc.h | 2 ++ mm/balloon_compaction.c | 1 - mm/compaction.c | 5 ++--- mm/migrate.c | 23 +++++++++++++++++++++++ mm/zpdesc.h | 5 ++--- mm/zsmalloc.c | 8 +++----- 8 files changed, 35 insertions(+), 25 deletions(-) diff --git a/include/linux/balloon_compaction.h b/include/linux/balloon_compaction.h index 9bce8e9f5018c..a8a1706cc56f3 100644 --- a/include/linux/balloon_compaction.h +++ b/include/linux/balloon_compaction.h @@ -92,7 +92,7 @@ static inline void balloon_page_insert(struct balloon_dev_info *balloon, struct page *page) { __SetPageOffline(page); - __SetPageMovable(page, &balloon_mops); + __SetPageMovable(page); set_page_private(page, (unsigned long)balloon); list_add(&page->lru, &balloon->pages); } diff --git a/include/linux/migrate.h b/include/linux/migrate.h index e04035f70e36f..6aece3f3c8be8 100644 --- a/include/linux/migrate.h +++ b/include/linux/migrate.h @@ -104,23 +104,13 @@ static inline int migrate_huge_page_move_mapping(struct address_space *mapping, #endif /* CONFIG_MIGRATION */ #ifdef CONFIG_COMPACTION -void __SetPageMovable(struct page *page, const struct movable_operations *ops); +void __SetPageMovable(struct page *page); #else -static inline void __SetPageMovable(struct page *page, - const struct movable_operations *ops) +static inline void __SetPageMovable(struct page *page) { } #endif -static inline -const struct movable_operations *page_movable_ops(struct page *page) -{ - VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(page), page); - - return (const struct movable_operations *) - ((unsigned long)page->mapping - PAGE_MAPPING_MOVABLE); -} - #ifdef CONFIG_NUMA_BALANCING int migrate_misplaced_folio_prepare(struct folio *folio, struct vm_area_struct *vma, int node); diff --git a/include/linux/zsmalloc.h b/include/linux/zsmalloc.h index 13e9cc5490f71..f3ccff2d966cd 100644 --- a/include/linux/zsmalloc.h +++ b/include/linux/zsmalloc.h @@ -46,4 +46,6 @@ void zs_obj_read_end(struct zs_pool *pool, unsigned long handle, void zs_obj_write(struct zs_pool *pool, unsigned long handle, void *handle_mem, size_t mem_len); +extern const struct movable_operations zsmalloc_mops; + #endif diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index e4f1a122d786b..2a4a649805c11 100644 --- a/mm/balloon_compaction.c +++ b/mm/balloon_compaction.c @@ -253,6 +253,5 @@ const struct movable_operations balloon_mops = { .isolate_page = balloon_page_isolate, .putback_page = balloon_page_putback, }; -EXPORT_SYMBOL_GPL(balloon_mops); #endif /* CONFIG_BALLOON_COMPACTION */ diff --git a/mm/compaction.c b/mm/compaction.c index 41fd6a1fe9a33..348eb754cb227 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -114,11 +114,10 @@ static unsigned long release_free_list(struct list_head *freepages) } #ifdef CONFIG_COMPACTION -void __SetPageMovable(struct page *page, const struct movable_operations *mops) +void __SetPageMovable(struct page *page) { VM_BUG_ON_PAGE(!PageLocked(page), page); - VM_BUG_ON_PAGE((unsigned long)mops & PAGE_MAPPING_MOVABLE, page); - page->mapping = (void *)((unsigned long)mops | PAGE_MAPPING_MOVABLE); + page->mapping = (void *)(PAGE_MAPPING_MOVABLE); } EXPORT_SYMBOL(__SetPageMovable); diff --git a/mm/migrate.c b/mm/migrate.c index e307b142ab41a..fde6221562399 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -43,6 +43,8 @@ #include #include #include +#include +#include #include @@ -51,6 +53,27 @@ #include "internal.h" #include "swap.h" +static const struct movable_operations *page_movable_ops(struct page *page) +{ + VM_WARN_ON_ONCE_PAGE(!page_has_movable_ops(page), page); + + /* + * If we enable page migration for a page of a certain type by marking + * it as movable, the page type must be sticky until the page gets freed + * back to the buddy. + */ +#ifdef CONFIG_BALLOON_COMPACTION + if (PageOffline(page)) + /* Only balloon compaction sets PageOffline pages movable. */ + return &balloon_mops; +#endif /* CONFIG_BALLOON_COMPACTION */ +#if defined(CONFIG_ZSMALLOC) && defined(CONFIG_COMPACTION) + if (PageZsmalloc(page)) + return &zsmalloc_mops; +#endif /* defined(CONFIG_ZSMALLOC) && defined(CONFIG_COMPACTION) */ + return NULL; +} + /** * isolate_movable_ops_page - isolate a movable_ops page for migration * @page: The page. diff --git a/mm/zpdesc.h b/mm/zpdesc.h index 5763f36039736..6855d9e2732d8 100644 --- a/mm/zpdesc.h +++ b/mm/zpdesc.h @@ -152,10 +152,9 @@ static inline struct zpdesc *pfn_zpdesc(unsigned long pfn) return page_zpdesc(pfn_to_page(pfn)); } -static inline void __zpdesc_set_movable(struct zpdesc *zpdesc, - const struct movable_operations *mops) +static inline void __zpdesc_set_movable(struct zpdesc *zpdesc) { - __SetPageMovable(zpdesc_page(zpdesc), mops); + __SetPageMovable(zpdesc_page(zpdesc)); } static inline void __zpdesc_set_zsmalloc(struct zpdesc *zpdesc) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index b12250e219bb7..4aaff7c26ea96 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1685,8 +1685,6 @@ static void lock_zspage(struct zspage *zspage) #ifdef CONFIG_COMPACTION -static const struct movable_operations zsmalloc_mops; - static void replace_sub_page(struct size_class *class, struct zspage *zspage, struct zpdesc *newzpdesc, struct zpdesc *oldzpdesc) { @@ -1709,7 +1707,7 @@ static void replace_sub_page(struct size_class *class, struct zspage *zspage, set_first_obj_offset(newzpdesc, first_obj_offset); if (unlikely(ZsHugePage(zspage))) newzpdesc->handle = oldzpdesc->handle; - __zpdesc_set_movable(newzpdesc, &zsmalloc_mops); + __zpdesc_set_movable(newzpdesc); } static bool zs_page_isolate(struct page *page, isolate_mode_t mode) @@ -1819,7 +1817,7 @@ static void zs_page_putback(struct page *page) { } -static const struct movable_operations zsmalloc_mops = { +const struct movable_operations zsmalloc_mops = { .isolate_page = zs_page_isolate, .migrate_page = zs_page_migrate, .putback_page = zs_page_putback, @@ -1882,7 +1880,7 @@ static void SetZsPageMovable(struct zs_pool *pool, struct zspage *zspage) do { WARN_ON(!zpdesc_trylock(zpdesc)); - __zpdesc_set_movable(zpdesc, &zsmalloc_mops); + __zpdesc_set_movable(zpdesc); zpdesc_unlock(zpdesc); } while ((zpdesc = get_next_zpdesc(zpdesc)) != NULL); } -- 2.49.0