From patchwork Wed Sep 30 17:51:28 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 11810005 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 E4D6A139F for ; Wed, 30 Sep 2020 17:53:23 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (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 B295920706 for ; Wed, 30 Sep 2020 17:53:23 +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="M3Tbb4QD" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org B295920706 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=lst.de Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from list by lists.xenproject.org with outflank-mailman.859.2975 (Exim 4.92) (envelope-from ) id 1kNgHA-0005lY-Me; Wed, 30 Sep 2020 17:52:24 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 859.2975; Wed, 30 Sep 2020 17:52:24 +0000 X-BeenThere: xen-devel@lists.xenproject.org List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Precedence: list Sender: "Xen-devel" Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kNgHA-0005lQ-IT; Wed, 30 Sep 2020 17:52:24 +0000 Received: by outflank-mailman (input) for mailman id 859; Wed, 30 Sep 2020 17:52:23 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kNgH9-0005QF-P2 for xen-devel@lists.xenproject.org; Wed, 30 Sep 2020 17:52:23 +0000 Received: from casper.infradead.org (unknown [2001:8b0:10b:1236::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 3dccd41c-1fe1-4b8a-add8-0a44d2a61810; Wed, 30 Sep 2020 17:51:57 +0000 (UTC) Received: from [2001:4bb8:180:7b62:c70:4a89:bc61:4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNgGT-0001CE-Ri; Wed, 30 Sep 2020 17:51:42 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kNgH9-0005QF-P2 for xen-devel@lists.xenproject.org; Wed, 30 Sep 2020 17:52:23 +0000 X-Inumbo-ID: 3dccd41c-1fe1-4b8a-add8-0a44d2a61810 Received: from casper.infradead.org (unknown [2001:8b0:10b:1236::1]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 3dccd41c-1fe1-4b8a-add8-0a44d2a61810; Wed, 30 Sep 2020 17:51:57 +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=M3Tbb4QDvZEB1jbyEf0zJWIKkr nsFTLnSIZqI8QYGmIiSkEVuDgyTbX11zpin6j4Xj4PAlzHD6EPbIFh4MYGfKcFDXGaIq9esb38glz BfxJg0Xoz/e4RdpmmFDnE5RCczkS/ME5mvb2gDl9n8kUi1sdaXtqZ5hZECsmk7hMidHWB9u0habxP bp5hPzRBRk4x3Rr8nBHcLZRwnezNOP5GK53mekiKxs7AbqdDPINnDba35L2IW+Wwca7AuUcGDzHpx WSaLvg3gVpyU3iVkbJPZCTDRLYwL+qFsKIZaO3/DfALtS7c3FigAmDk7P1enBSi89Kh7QrWQmC7C8 lvDZP1tA==; Received: from [2001:4bb8:180:7b62:c70:4a89:bc61:4] (helo=localhost) by casper.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kNgGT-0001CE-Ri; Wed, 30 Sep 2020 17:51:42 +0000 From: Christoph Hellwig To: Andrew Morton Cc: Peter Zijlstra , Boris Ostrovsky , Juergen Gross , Stefano Stabellini , Jani Nikula , Joonas Lahtinen , Tvrtko Ursulin , Chris Wilson , Matthew Auld , Rodrigo Vivi , Minchan Kim , Matthew Wilcox , Nitin Gupta , x86@kernel.org, xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org, intel-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-mm@kvack.org Subject: [PATCH 05/10] zsmalloc: switch from alloc_vm_area to get_vm_area Date: Wed, 30 Sep 2020 19:51:28 +0200 Message-Id: <20200930175133.1252382-6-hch@lst.de> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20200930175133.1252382-1-hch@lst.de> References: <20200930175133.1252382-1-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 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)