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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9300CC55ABD for ; Fri, 6 Nov 2020 00:52:11 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id E965A20782 for ; Fri, 6 Nov 2020 00:52:10 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=nvidia.com header.i=@nvidia.com header.b="jycxpJC/" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E965A20782 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=nvidia.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id AC4266B0205; Thu, 5 Nov 2020 19:52:07 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 9AC2B6B0206; Thu, 5 Nov 2020 19:52:07 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 7898F6B0207; Thu, 5 Nov 2020 19:52:07 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0116.hostedemail.com [216.40.44.116]) by kanga.kvack.org (Postfix) with ESMTP id 45A506B0203 for ; Thu, 5 Nov 2020 19:52:07 -0500 (EST) Received: from smtpin05.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id DE4A41EE6 for ; Fri, 6 Nov 2020 00:52:06 +0000 (UTC) X-FDA: 77452166652.05.milk37_4512627272ce Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin05.hostedemail.com (Postfix) with ESMTP id C10F918028202 for ; Fri, 6 Nov 2020 00:52:06 +0000 (UTC) X-HE-Tag: milk37_4512627272ce X-Filterd-Recvd-Size: 4439 Received: from hqnvemgate25.nvidia.com (hqnvemgate25.nvidia.com [216.228.121.64]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Nov 2020 00:52:06 +0000 (UTC) Received: from hqmail.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate25.nvidia.com (using TLS: TLSv1.2, AES256-SHA) id ; Thu, 05 Nov 2020 16:52:03 -0800 Received: from HQMAIL105.nvidia.com (172.20.187.12) by HQMAIL101.nvidia.com (172.20.187.10) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Fri, 6 Nov 2020 00:51:59 +0000 Received: from rcampbell-dev.nvidia.com (10.124.1.5) by mail.nvidia.com (172.20.187.12) with Microsoft SMTP Server id 15.0.1473.3 via Frontend Transport; Fri, 6 Nov 2020 00:51:59 +0000 From: Ralph Campbell To: , , , CC: Jerome Glisse , John Hubbard , Alistair Popple , Christoph Hellwig , "Jason Gunthorpe" , Bharata B Rao , Zi Yan , "Kirill A . Shutemov" , Yang Shi , Ben Skeggs , Shuah Khan , Andrew Morton , Ralph Campbell Subject: [PATCH v3 1/6] mm/thp: add prep_transhuge_device_private_page() Date: Thu, 5 Nov 2020 16:51:42 -0800 Message-ID: <20201106005147.20113-2-rcampbell@nvidia.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20201106005147.20113-1-rcampbell@nvidia.com> References: <20201106005147.20113-1-rcampbell@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: quoted-printable Content-Type: text/plain DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1604623923; bh=MxvX11Do/3TUW7vYVdXjys2hT9iLLmhsTNuHLf5CCr8=; h=From:To:CC:Subject:Date:Message-ID:X-Mailer:In-Reply-To: References:MIME-Version:X-NVConfidentiality: Content-Transfer-Encoding:Content-Type; b=jycxpJC/sIQZd6sCGvcrgobqobx/hb+2eYyacKc6TH4S0nfwyol+QFqcBb3W/gDPy f6cAT+my0FZ/zM/BKJ2f5Npp4lo+QkW8SIlLXL0JNJmrUnqRFdBv/aeKUgaGG2uYId t/H/ElW+D+WfTRyPAqlX5rUPMWlVAub+vwtrPjAo979gBgan5xECfXatoCNS6kPhMz vFSjXJV5E5Ih2U4dUsypaiJB576mHrBc4XEUvG1j1u+z3UPYLk5m6JM3aJqzErWcGz iwpZPWyEfrSYv2pKhQFhoH1r/8s0MvYggRMW6CcubxCYwKBwr2VKdHr/JCSiTlyC6P UbTX+0jw2ODtA== 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: Add a helper function to allow device drivers to create device private transparent huge pages. This is intended to help support device private THP migrations. Signed-off-by: Ralph Campbell --- include/linux/huge_mm.h | 5 +++++ mm/huge_memory.c | 9 +++++++++ 2 files changed, 14 insertions(+) diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h index 0365aa97f8e7..3ec26ef27a93 100644 --- a/include/linux/huge_mm.h +++ b/include/linux/huge_mm.h @@ -184,6 +184,7 @@ extern unsigned long thp_get_unmapped_area(struct file = *filp, unsigned long flags); =20 extern void prep_transhuge_page(struct page *page); +extern void prep_transhuge_device_private_page(struct page *page); extern void free_transhuge_page(struct page *page); bool is_transparent_hugepage(struct page *page); =20 @@ -377,6 +378,10 @@ static inline bool transhuge_vma_suitable(struct vm_ar= ea_struct *vma, =20 static inline void prep_transhuge_page(struct page *page) {} =20 +static inline void prep_transhuge_device_private_page(struct page *page) +{ +} + static inline bool is_transparent_hugepage(struct page *page) { return false; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 08a183f6c3ab..b4141f12ff31 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -498,6 +498,15 @@ void prep_transhuge_page(struct page *page) set_compound_page_dtor(page, TRANSHUGE_PAGE_DTOR); } =20 +void prep_transhuge_device_private_page(struct page *page) +{ + prep_compound_page(page, HPAGE_PMD_ORDER); + prep_transhuge_page(page); + /* Only the head page has a reference to the pgmap. */ + percpu_ref_put_many(page->pgmap->ref, HPAGE_PMD_NR - 1); +} +EXPORT_SYMBOL_GPL(prep_transhuge_device_private_page); + bool is_transparent_hugepage(struct page *page) { if (!PageCompound(page)) --=20 2.20.1