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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2A137C0729B for ; Wed, 16 Aug 2023 15:13:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344043AbjHPPMd (ORCPT ); Wed, 16 Aug 2023 11:12:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60154 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344083AbjHPPMR (ORCPT ); Wed, 16 Aug 2023 11:12:17 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2F43026A1 for ; Wed, 16 Aug 2023 08:12:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=TyqYL8l3qs+xOFQuesU5MOYpRgSi95CwYfVSpPbXZWA=; b=ALXkIbksumnsHHzGJk5XV5Da9S +oitdX450l78/oEz2xFPniFUnC3jjMneq6gxMiMjPiGnWD5RrW8lA0dXRX17krh+vAgjeLvA9NFMe TVLycQ/QXKjgwI1e0b5rYbWoJzCa5W2aguQ6pY7r6tdgz860KetDC9GVekzrv/S0l5LUpQyQosutq soHHJBFf6nrX94ciA/Ihavh/nZol+9jPWipjQwVsSp+Oi3kDn7Godj/Lr9TWyC2Po/jrpyBN3TpxP 25+mO5nUueLwjlQw5XololLzaXq2mzUMOlgp2FWh5o7MkOnbMZOarM5319l6hjR64o7pePb+DAmDc u17NN8hA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1qWIBu-00FL8V-75; Wed, 16 Aug 2023 15:12:10 +0000 From: "Matthew Wilcox (Oracle)" To: Andrew Morton Cc: "Matthew Wilcox (Oracle)" , Jens Axboe , io-uring@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v2 04/13] mm: Convert free_transhuge_folio() to folio_undo_large_rmappable() Date: Wed, 16 Aug 2023 16:11:52 +0100 Message-Id: <20230816151201.3655946-5-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230816151201.3655946-1-willy@infradead.org> References: <20230816151201.3655946-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org Indirect calls are expensive, thanks to Spectre. Test for TRANSHUGE_PAGE_DTOR and destroy the folio appropriately. Move the free_compound_page() call into destroy_large_folio() to simplify later patches. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/huge_mm.h | 2 -- include/linux/mm.h | 2 -- mm/huge_memory.c | 22 +++++++++++----------- mm/internal.h | 2 ++ mm/page_alloc.c | 9 ++++++--- 5 files changed, 19 insertions(+), 18 deletions(-) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 20284387b841..f351c3f9d58b 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -144,8 +144,6 @@ unsigned long thp_get_unmapped_area(struct file *filp, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags); void prep_transhuge_page(struct page *page); -void free_transhuge_page(struct page *page); - bool can_split_folio(struct folio *folio, int *pextra_pins); int split_huge_page_to_list(struct page *page, struct list_head *list); static inline int split_huge_page(struct page *page) diff --git a/include/linux/mm.h b/include/linux/mm.h index 19493d6a2bb8..6c338b65b86b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1281,9 +1281,7 @@ enum compound_dtor_id { #ifdef CONFIG_HUGETLB_PAGE HUGETLB_PAGE_DTOR, #endif -#ifdef CONFIG_TRANSPARENT_HUGEPAGE TRANSHUGE_PAGE_DTOR, -#endif NR_COMPOUND_DTORS, }; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 8480728fa220..9598bbe6c792 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -2779,10 +2779,9 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) return ret; } -void free_transhuge_page(struct page *page) +void folio_undo_large_rmappable(struct folio *folio) { - struct folio *folio = (struct folio *)page; - struct deferred_split *ds_queue = get_deferred_split_queue(folio); + struct deferred_split *ds_queue; unsigned long flags; /* @@ -2790,15 +2789,16 @@ void free_transhuge_page(struct page *page) * deferred_list. If folio is not in deferred_list, it's safe * to check without acquiring the split_queue_lock. */ - if (data_race(!list_empty(&folio->_deferred_list))) { - spin_lock_irqsave(&ds_queue->split_queue_lock, flags); - if (!list_empty(&folio->_deferred_list)) { - ds_queue->split_queue_len--; - list_del(&folio->_deferred_list); - } - spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); + if (data_race(list_empty(&folio->_deferred_list))) + return; + + ds_queue = get_deferred_split_queue(folio); + spin_lock_irqsave(&ds_queue->split_queue_lock, flags); + if (!list_empty(&folio->_deferred_list)) { + ds_queue->split_queue_len--; + list_del(&folio->_deferred_list); } - free_compound_page(page); + spin_unlock_irqrestore(&ds_queue->split_queue_lock, flags); } void deferred_split_folio(struct folio *folio) diff --git a/mm/internal.h b/mm/internal.h index 5a03bc4782a2..1e98c867f0de 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -413,6 +413,8 @@ static inline void folio_set_order(struct folio *folio, unsigned int order) #endif } +void folio_undo_large_rmappable(struct folio *folio); + static inline void prep_compound_head(struct page *page, unsigned int order) { struct folio *folio = (struct folio *)page; diff --git a/mm/page_alloc.c b/mm/page_alloc.c index b569fd5562aa..0dbc2ecdefa5 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -287,9 +287,6 @@ const char * const migratetype_names[MIGRATE_TYPES] = { static compound_page_dtor * const compound_page_dtors[NR_COMPOUND_DTORS] = { [NULL_COMPOUND_DTOR] = NULL, [COMPOUND_PAGE_DTOR] = free_compound_page, -#ifdef CONFIG_TRANSPARENT_HUGEPAGE - [TRANSHUGE_PAGE_DTOR] = free_transhuge_page, -#endif }; int min_free_kbytes = 1024; @@ -624,6 +621,12 @@ void destroy_large_folio(struct folio *folio) return; } + if (folio_test_transhuge(folio) && dtor == TRANSHUGE_PAGE_DTOR) { + folio_undo_large_rmappable(folio); + free_compound_page(&folio->page); + return; + } + VM_BUG_ON_FOLIO(dtor >= NR_COMPOUND_DTORS, folio); compound_page_dtors[dtor](&folio->page); } -- 2.40.1