From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <bruce.richardson@intel.com>
Received: from mga01.intel.com (mga01.intel.com [192.55.52.88])
 by dpdk.org (Postfix) with ESMTP id 4523D5A80
 for <dev@dpdk.org>; Fri, 16 Jan 2015 12:01:14 +0100 (CET)
Received: from orsmga001.jf.intel.com ([10.7.209.18])
 by fmsmga101.fm.intel.com with ESMTP; 16 Jan 2015 03:01:09 -0800
X-ExtLoop1: 1
X-IronPort-AV: E=Sophos;i="5.09,410,1418112000"; d="scan'208";a="638278704"
Received: from bricha3-mobl3.ger.corp.intel.com ([10.243.20.34])
 by orsmga001.jf.intel.com with SMTP; 16 Jan 2015 03:01:07 -0800
Received: by  (sSMTP sendmail emulation); Fri, 16 Jan 2015 11:01:06 +0025
Date: Fri, 16 Jan 2015 11:01:06 +0000
From: Bruce Richardson <bruce.richardson@intel.com>
To: "Jack,Xie Jie" <jack.xie@dragonipt.com>
Message-ID: <20150116110105.GC10516@bricha3-MOBL3>
References: <25CC404E73236E4FB06CE423D5EE8B229B4F34@AZ10EXMBX22.hosting.local>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <25CC404E73236E4FB06CE423D5EE8B229B4F34@AZ10EXMBX22.hosting.local>
Organization: Intel Shannon Ltd.
User-Agent: Mutt/1.5.23 (2014-03-12)
Cc: "dev@dpdk.org" <dev@dpdk.org>
Subject: Re: [dpdk-dev] how does it count the number of contiguous physical
 pages in map_all_hugepages
X-BeenThere: dev@dpdk.org
X-Mailman-Version: 2.1.15
Precedence: list
List-Id: patches and discussions about DPDK <dev.dpdk.org>
List-Unsubscribe: <http://dpdk.org/ml/options/dev>,
 <mailto:dev-request@dpdk.org?subject=unsubscribe>
List-Archive: <http://dpdk.org/ml/archives/dev/>
List-Post: <mailto:dev@dpdk.org>
List-Help: <mailto:dev-request@dpdk.org?subject=help>
List-Subscribe: <http://dpdk.org/ml/listinfo/dev>,
 <mailto:dev-request@dpdk.org?subject=subscribe>
X-List-Received-Date: Fri, 16 Jan 2015 11:01:15 -0000

On Fri, Jan 16, 2015 at 05:32:08AM +0000, Jack,Xie Jie wrote:
> Hi,
> 
> I am learning DPDK recently, when I check l2fwd example, I am a little confused, please someone give me a clue.
> 
> In function map_all_hugepages called in rte_eal_hugepage_init,
> There are lines of source code like below to count the number of contiguous physical pages,
> But I check the source code, I just cannot find where is hugepg_tbl[j].physaddr be set before,
> how can here check the value of hugepg_tbl[j].physaddr.
> 
> /* reserve a virtual area for next contiguous
>                             * physical block: count the number of
>                             * contiguous physical pages. */
>                             for (j = i+1; j < hpi->num_pages[0] ; j++) {
>                                      if (hugepg_tbl[j].physaddr !=
>                                          hugepg_tbl[j-1].physaddr + hugepage_sz)
>                                                break;
>                             }
> 
> 
> Thanks !
> Jack

See function "find_physaddrs" in "eal_memory.c".

Regards,
/Bruce