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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 446F7C433EF for ; Fri, 24 Jun 2022 19:10:35 +0000 (UTC) Received: from list by lists.xenproject.org with outflank-mailman.355833.583750 (Exim 4.92) (envelope-from ) id 1o4ohD-0003E4-RK; Fri, 24 Jun 2022 19:10:23 +0000 X-Outflank-Mailman: Message body and most headers restored to incoming version Received: by outflank-mailman (output) from mailman id 355833.583750; Fri, 24 Jun 2022 19:10:23 +0000 Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o4ohD-0003Dx-OB; Fri, 24 Jun 2022 19:10:23 +0000 Received: by outflank-mailman (input) for mailman id 355833; Fri, 24 Jun 2022 19:10:22 +0000 Received: from mail.xenproject.org ([104.130.215.37]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o4ohC-0003Dr-3U for xen-devel@lists.xenproject.org; Fri, 24 Jun 2022 19:10:22 +0000 Received: from xenbits.xenproject.org ([104.239.192.120]) by mail.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1o4ohB-0005m2-QP; Fri, 24 Jun 2022 19:10:21 +0000 Received: from 54-240-197-238.amazon.com ([54.240.197.238] helo=[192.168.4.76]) by xenbits.xenproject.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.92) (envelope-from ) id 1o4ohB-0008HW-K3; Fri, 24 Jun 2022 19:10:21 +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" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=xen.org; s=20200302mail; h=Content-Transfer-Encoding:Content-Type:In-Reply-To:From: References:Cc:To:Subject:MIME-Version:Date:Message-ID; bh=q1f0OwZV0j2RYU6Cm6ogVRo1zLLGWLKZ6IO1I6ztJ8s=; b=g+NdlN7YenniLmUIFPIS3fmZH4 GBcCO8j0d6ASEBeLZVYbhTq9G2IDZq696rlZihrN7zIGA/UFHSeaTgaXCU3wqVPj9rpTwG1eW/wMv oOfiFKoRxNMcP5bSyL/9bgH7RpXutg2F6FMWAvIgHe0qkL7yKo55IpunZ/H5HW+XXIU8=; Message-ID: Date: Fri, 24 Jun 2022 20:10:19 +0100 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:91.0) Gecko/20100101 Thunderbird/91.10.0 Subject: Re: [PATCH v5 4/8] xen/arm: introduce put_page_nr and get_page_nr To: Penny Zheng , xen-devel@lists.xenproject.org Cc: wei.chen@arm.com, Stefano Stabellini , Bertrand Marquis , Volodymyr Babchuk References: <20220620051114.210118-1-Penny.Zheng@arm.com> <20220620051114.210118-5-Penny.Zheng@arm.com> From: Julien Grall In-Reply-To: <20220620051114.210118-5-Penny.Zheng@arm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi Penny, On 20/06/2022 06:11, Penny Zheng wrote: > Later, we need to add the right amount of references, which should be > the number of borrower domains, to the owner domain. Since we only have > get_page() to increment the page reference by 1, a loop is needed per > page, which is inefficient and time-consuming. > > To save the loop time, this commit introduces a set of new helpers > put_page_nr() and get_page_nr() to increment/drop the page reference by nr. > > Signed-off-by: Penny Zheng > Reviewed-by: Stefano Stabellini Reviewed-by: Julien Grall Cheers, -- Julien Grall