From patchwork Fri Oct 2 12:21:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11813209 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 19D6F139A for ; Fri, 2 Oct 2020 12:22:33 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DD713207EA for ; Fri, 2 Oct 2020 12:22:32 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="Tj33JCJU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DD713207EA Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 53F6A6E949; Fri, 2 Oct 2020 12:22:29 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by gabe.freedesktop.org (Postfix) with ESMTPS id 760F06E93E; Fri, 2 Oct 2020 12:22:28 +0000 (UTC) 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=ggovDsPrY2tPPXwEEhp2BvATO0PndCnAzmG0yva7UFo=; b=Tj33JCJUX19+gC9K2zBUyM8lNn 7XlD88P+JGNEKhd/mdMC9AiMPqnZSBlOBX690hs6gCM3ciOXom3s2u8Ke0OjaLx3YinIgLt7mImm8 UmjTvrKNrSJYGEVTht5vkZgfbNFTsKzLIt4H4yJRQkSZ3GDvS1aeS1MkChysP6OZqNpza2Wl8qG1y 02oWiQAil8ZxcXE/BzMpRO3LwlTESNaZROOSlh6z+eO2Wj/NYpc0NqRPw6TMjrzU0yqzYvy1/oCBt SUQqJ/8eIxAUEAVMv2l1zNgwum1Gn/b4cxLdXsSFWojo5hZJcx/OEXTBbmeKA2LtfYkYsVcdXDxh/ FCkcqWfA==; Received: from [2001:4bb8:180:7b62:f738:1861:1acc:15c8] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kOK4i-0003LQ-O5; Fri, 02 Oct 2020 12:22:13 +0000 From: Christoph Hellwig To: Andrew Morton Date: Fri, 2 Oct 2020 14:21:58 +0200 Message-Id: <20201002122204.1534411-6-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201002122204.1534411-1-hch@lst.de> References: <20201002122204.1534411-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Subject: [Intel-gfx] [PATCH 05/11] zsmalloc: switch from alloc_vm_area to get_vm_area X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juergen Gross , Stefano Stabellini , Matthew Wilcox , dri-devel@lists.freedesktop.org, linux-mm@kvack.org, Peter Zijlstra , linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, x86@kernel.org, Chris Wilson , Minchan Kim , Matthew Auld , xen-devel@lists.xenproject.org, Boris Ostrovsky , Nitin Gupta Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Just manually pre-fault the PTEs using apply_to_page_range. Co-developed-by: Minchan Kim Signed-off-by: Christoph Hellwig --- mm/zsmalloc.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c index c36fdff9a37131..918c7b019b3d78 100644 --- a/mm/zsmalloc.c +++ b/mm/zsmalloc.c @@ -1122,10 +1122,16 @@ static inline int __zs_cpu_up(struct mapping_area *area) */ if (area->vm) return 0; - area->vm = alloc_vm_area(PAGE_SIZE * 2, NULL); + area->vm = get_vm_area(PAGE_SIZE * 2, 0); if (!area->vm) return -ENOMEM; - return 0; + + /* + * Populate ptes in advance to avoid pte allocation with GFP_KERNEL + * in non-preemtible context of zs_map_object. + */ + return apply_to_page_range(&init_mm, (unsigned long)area->vm->addr, + PAGE_SIZE * 2, NULL, NULL); } static inline void __zs_cpu_down(struct mapping_area *area)