From patchwork Sun Sep 4 02:16:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dan Williams X-Patchwork-Id: 12965076 Received: from mga02.intel.com (mga02.intel.com [134.134.136.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 378A57E for ; Sun, 4 Sep 2022 02:16:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1662257778; x=1693793778; h=subject:from:to:cc:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=sipDxMIA1gHM4rUMbFjWahw5uArq5Zq1WCPqnel5xNA=; b=eQiLH7gvKpjWC6Ut293xKgEtm1K/8HFpx9Id/cg4nWmFS+3+aIcBFMdm 1pCy+Da+7vlkqg0yctsp3RAzM15AzFe08L06dX50Ebcv2AAT/PljhlIxn obre2P/Bw5lmvznjmvNWx/3jYGUVcKEu8lYCkOeJ60BPY0S3KXuAQGQOL 9GTZcc+/YvBou7i6eHWUXGs1toiN/sEhHGucz6NeFfaDpTUXyNSBFhrnJ k1pSMfN4DMyt0mZk22tqF6eMzWdL8Bd40exUbrf/LxDXU7bxhwUkyeWzh D/XoEab2TzXsBsDVF2BGgn3Q3/u+gTR69MOgk/XneQOENzMmWH8TlBtC0 A==; X-IronPort-AV: E=McAfee;i="6500,9779,10459"; a="283193992" X-IronPort-AV: E=Sophos;i="5.93,288,1654585200"; d="scan'208";a="283193992" Received: from orsmga008.jf.intel.com ([10.7.209.65]) by orsmga101.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2022 19:16:18 -0700 X-IronPort-AV: E=Sophos;i="5.93,288,1654585200"; d="scan'208";a="643384493" Received: from pg4-mobl3.amr.corp.intel.com (HELO dwillia2-xfh.jf.intel.com) ([10.212.132.198]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 03 Sep 2022 19:16:17 -0700 Subject: [PATCH 03/13] fsdax: Delete put_devmap_managed_page_refs() From: Dan Williams To: akpm@linux-foundation.org Cc: Matthew Wilcox , Jan Kara , "Darrick J. Wong" , Jason Gunthorpe , Christoph Hellwig , John Hubbard , linux-mm@kvack.org, nvdimm@lists.linux.dev, linux-fsdevel@vger.kernel.org Date: Sat, 03 Sep 2022 19:16:17 -0700 Message-ID: <166225777752.2351842.10384480208879805937.stgit@dwillia2-xfh.jf.intel.com> In-Reply-To: <166225775968.2351842.11156458342486082012.stgit@dwillia2-xfh.jf.intel.com> References: <166225775968.2351842.11156458342486082012.stgit@dwillia2-xfh.jf.intel.com> User-Agent: StGit/0.18-3-g996c Precedence: bulk X-Mailing-List: nvdimm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Now that fsdax DMA-idle detection no longer depends on catching transitions of page->_refcount to 1, remove put_devmap_managed_page_refs() and associated infrastructure. Cc: Matthew Wilcox Cc: Jan Kara Cc: "Darrick J. Wong" Cc: Jason Gunthorpe Cc: Christoph Hellwig Cc: John Hubbard Signed-off-by: Dan Williams --- include/linux/mm.h | 30 ------------------------------ mm/gup.c | 3 +-- mm/memremap.c | 18 ------------------ mm/swap.c | 2 -- 4 files changed, 1 insertion(+), 52 deletions(-) diff --git a/include/linux/mm.h b/include/linux/mm.h index 557d5447ebec..24f8682d0cd7 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1048,30 +1048,6 @@ vm_fault_t finish_mkwrite_fault(struct vm_fault *vmf); * back into memory. */ -#if defined(CONFIG_ZONE_DEVICE) && defined(CONFIG_FS_DAX) -DECLARE_STATIC_KEY_FALSE(devmap_managed_key); - -bool __put_devmap_managed_page_refs(struct page *page, int refs); -static inline bool put_devmap_managed_page_refs(struct page *page, int refs) -{ - if (!static_branch_unlikely(&devmap_managed_key)) - return false; - if (!is_zone_device_page(page)) - return false; - return __put_devmap_managed_page_refs(page, refs); -} -#else /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ -static inline bool put_devmap_managed_page_refs(struct page *page, int refs) -{ - return false; -} -#endif /* CONFIG_ZONE_DEVICE && CONFIG_FS_DAX */ - -static inline bool put_devmap_managed_page(struct page *page) -{ - return put_devmap_managed_page_refs(page, 1); -} - /* 127: arbitrary random number, small enough to assemble well */ #define folio_ref_zero_or_close_to_overflow(folio) \ ((unsigned int) folio_ref_count(folio) + 127u <= 127u) @@ -1168,12 +1144,6 @@ static inline void put_page(struct page *page) { struct folio *folio = page_folio(page); - /* - * For some devmap managed pages we need to catch refcount transition - * from 2 to 1: - */ - if (put_devmap_managed_page(&folio->page)) - return; folio_put(folio); } diff --git a/mm/gup.c b/mm/gup.c index 499c46296fda..67dfffe97917 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -87,8 +87,7 @@ static inline struct folio *try_get_folio(struct page *page, int refs) * belongs to this folio. */ if (unlikely(page_folio(page) != folio)) { - if (!put_devmap_managed_page_refs(&folio->page, refs)) - folio_put_refs(folio, refs); + folio_put_refs(folio, refs); goto retry; } diff --git a/mm/memremap.c b/mm/memremap.c index 58b20c3c300b..433500e955fb 100644 --- a/mm/memremap.c +++ b/mm/memremap.c @@ -507,21 +507,3 @@ void free_zone_device_page(struct page *page) */ set_page_count(page, 1); } - -#ifdef CONFIG_FS_DAX -bool __put_devmap_managed_page_refs(struct page *page, int refs) -{ - if (page->pgmap->type != MEMORY_DEVICE_FS_DAX) - return false; - - /* - * fsdax page refcounts are 1-based, rather than 0-based: if - * refcount is 1, then the page is free and the refcount is - * stable because nobody holds a reference on the page. - */ - if (page_ref_sub_return(page, refs) == 1) - wake_up_var(&page->_refcount); - return true; -} -EXPORT_SYMBOL(__put_devmap_managed_page_refs); -#endif /* CONFIG_FS_DAX */ diff --git a/mm/swap.c b/mm/swap.c index 9cee7f6a3809..b346dd24cde8 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -960,8 +960,6 @@ void release_pages(struct page **pages, int nr) unlock_page_lruvec_irqrestore(lruvec, flags); lruvec = NULL; } - if (put_devmap_managed_page(&folio->page)) - continue; if (folio_put_testzero(folio)) free_zone_device_page(&folio->page); continue;