From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from dpdk.org (dpdk.org [92.243.14.124]) by inbox.dpdk.org (Postfix) with ESMTP id 1A5DDA00E6 for ; Thu, 11 Jul 2019 11:43:40 +0200 (CEST) Received: from [92.243.14.124] (localhost [127.0.0.1]) by dpdk.org (Postfix) with ESMTP id 453BA3772; Thu, 11 Jul 2019 11:43:38 +0200 (CEST) Received: from mga17.intel.com (mga17.intel.com [192.55.52.151]) by dpdk.org (Postfix) with ESMTP id 3F5F81D7; Thu, 11 Jul 2019 11:43:36 +0200 (CEST) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga005.fm.intel.com ([10.253.24.32]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 11 Jul 2019 02:43:35 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.63,478,1557212400"; d="scan'208";a="364761054" Received: from aburakov-mobl1.ger.corp.intel.com (HELO [10.237.220.82]) ([10.237.220.82]) by fmsmga005.fm.intel.com with ESMTP; 11 Jul 2019 02:43:34 -0700 To: Yasufumi Ogawa Cc: dev@dpdk.org, stable@dpdk.org References: <1555379952-23517-1-git-send-email-ogawa.yasufumi@lab.ntt.co.jp> <1555386203-23776-1-git-send-email-ogawa.yasufumi@lab.ntt.co.jp> <1555386203-23776-2-git-send-email-ogawa.yasufumi@lab.ntt.co.jp> <95821e91-33f1-686c-f4c1-8ce7a07646d4@gmail.com> <35081f35-1967-93cb-096c-08761ed2658d@intel.com> <4e4ad489-7b1e-9406-4871-4a3ae7f318ee@gmail.com> From: "Burakov, Anatoly" Message-ID: <43297329-af7e-35e0-394c-d6513c1401e5@intel.com> Date: Thu, 11 Jul 2019 10:43:33 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.7.2 MIME-Version: 1.0 In-Reply-To: <4e4ad489-7b1e-9406-4871-4a3ae7f318ee@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH v2 1/1] fbarray: get fbarrays from containerized secondary X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" On 11-Jul-19 10:37 AM, Yasufumi Ogawa wrote: > On 2019/07/09 19:26, Burakov, Anatoly wrote: >> On 09-Jul-19 11:24 AM, Burakov, Anatoly wrote: >>> On 09-Jul-19 11:22 AM, Yasufumi Ogawa wrote: >>>> Hi Anatoly, >>>> >>>> On 2019/07/05 17:53, Burakov, Anatoly wrote: >>>>> On 16-Apr-19 4:43 AM, ogawa.yasufumi@lab.ntt.co.jp wrote: >>>>>> From: Yasufumi Ogawa >>>>>> >>>>>> In secondary_msl_create_walk(), it creates a file for fbarrays >>>>>> with its >>>>>> PID for reserving unique name among secondary processes. However, it >>>>>> does not work if secondary is run as app container because each of >>>>>> containerized secondary has PID 1. To reserve unique name, use >>>>>> hostname >>>>>> instead of PID if the value is 1. >>>>>> >>>>>> Cc: stable@dpdk.org >>>>>> >>>>>> Signed-off-by: Yasufumi Ogawa >>>>>> --- >>>>> >>>>> I'm not too well versed in containers - is this hostname 1) always >>>>> set, and 2) always unique? >>>> For docker, 1) hostname is always set. 2) The hostname is decided as >>>> short form of container ID, so it might not be unique even though >>>> very low possibility. >>>> >>>> I found that we can get whole container ID in `/proc/self/cgroup` as >>>> discussed [1]. I think using hostname is reasonable way without >>>> running many secondary processes. However, it might be better to use >>>> 64 digits full container ID instead of 12 digits short ID if ensure >>>> uniqueness strongly. What do yo think? >>>> >>>> [1] >>>> https://forums.docker.com/t/get-a-containers-full-id-from-inside-of-itself/37237 >>>> >>> >>> I think it's better to err on the side of caution and guarantee >>> better uniqueness. This code will get into an LTS and will be used >>> for years to come :) >>> >> >> ...however, i think a full 64-digit ID won't even fit into the fbarray >> filename, as i believe it's limited to something like 64 chars. >> Perhaps hostname would be enough after all... or we can increase >> fbarray name length - that would require ABI breakage but the ABI is >> already broken in this release, so it's OK i think. > OK. Just a note: you're targetting this fix towards stable too. For stable, you cannot break ABI, so we would have to do with the shorter hostname. It's only for 19.08 that you can change fbarray length and use the full 64-char container ID for uniqueness. > > >> Wouldn't an error in fscanf() leak the file handle? I think you need > to fclose() before checking the result. > > I would like to fix it. > I would like send v3 patch for fixing for fclose(). Please do :) > > Thanks, > Yasufumi > > -- Thanks, Anatoly