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From: "Burakov, Anatoly" <anatoly.burakov@intel.com>
To: Yasufumi Ogawa <yasufum.o@gmail.com>
Cc: dev@dpdk.org, stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH v2 1/1] fbarray: get fbarrays from containerized secondary
Date: Thu, 11 Jul 2019 10:43:33 +0100	[thread overview]
Message-ID: <43297329-af7e-35e0-394c-d6513c1401e5@intel.com> (raw)
In-Reply-To: <4e4ad489-7b1e-9406-4871-4a3ae7f318ee@gmail.com>

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 <ogawa.yasufumi@lab.ntt.co.jp>
>>>>>>
>>>>>> 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 <ogawa.yasufumi@lab.ntt.co.jp>
>>>>>> ---
>>>>>
>>>>> 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

  reply	other threads:[~2019-07-11  9:43 UTC|newest]

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16  1:59 [dpdk-dev] [PATCH] fbarray: get fbarrays from containerized secondary ogawa.yasufumi
2019-04-16  3:43 ` [dpdk-dev] [PATCH v2 0/1] Get " ogawa.yasufumi
2019-04-16  3:43   ` [dpdk-dev] [PATCH v2 1/1] fbarray: get " ogawa.yasufumi
2019-07-04 20:17     ` Thomas Monjalon
2019-07-05  8:53     ` Burakov, Anatoly
2019-07-09 10:22       ` Yasufumi Ogawa
2019-07-09 10:24         ` Burakov, Anatoly
2019-07-09 10:26           ` Burakov, Anatoly
2019-07-11  9:37             ` Yasufumi Ogawa
2019-07-11  9:43               ` Burakov, Anatoly [this message]
2019-07-11 10:31 ` [dpdk-dev] [PATCH v3 0/1] " yasufum.o
2019-07-11 10:31   ` [dpdk-dev] [PATCH v3 1/1] " yasufum.o
2019-07-11 10:53     ` Burakov, Anatoly
2019-07-11 11:57       ` Yasufumi Ogawa
2019-07-11 13:14         ` Burakov, Anatoly
2019-07-12  2:22           ` Yasufumi Ogawa
2019-07-22  1:06             ` Ogawa Yasufumi
2019-07-22  9:33               ` Burakov, Anatoly
2019-07-22  9:25             ` Burakov, Anatoly
2019-07-24  8:20   ` [dpdk-dev] [PATCH v4 0/1] " yasufum.o
2019-07-24  8:20     ` [dpdk-dev] [PATCH v4 1/1] " yasufum.o
2019-07-24  9:59       ` Burakov, Anatoly
2019-07-30  8:16         ` [dpdk-dev] [dpdk-stable] " Thomas Monjalon
2019-07-30  9:18           ` Burakov, Anatoly
2019-07-31  5:48             ` Yasufumi Ogawa
2019-10-11  9:36       ` [dpdk-dev] " David Marchand
2019-10-25 15:36         ` David Marchand
2019-10-25 19:54           ` Yasufumi Ogawa
2019-10-26 16:15             ` David Marchand
2019-10-26 18:11               ` Yasufumi Ogawa
2019-10-28  8:07     ` [dpdk-dev] [PATCH v5 0/1] fbarray: fix duplicated fbarray file in secondary yasufum.o
2019-10-28  8:07       ` [dpdk-dev] [PATCH v5 1/1] " yasufum.o
2019-10-29 12:03         ` Ananyev, Konstantin
2019-10-30 13:42           ` Yasufumi Ogawa
2019-10-30 19:00             ` Ananyev, Konstantin
2019-10-31 10:03               ` Yasufumi Ogawa
2019-10-31 10:32                 ` Ananyev, Konstantin
2019-11-01  9:04     ` [dpdk-dev] [PATCH v6 0/1] " yasufum.o
2019-11-01  9:04       ` [dpdk-dev] [PATCH v6 1/1] " yasufum.o
2019-11-01 12:01         ` Ananyev, Konstantin
2019-11-04 10:20         ` Burakov, Anatoly
2019-11-05 10:13           ` David Marchand
2019-11-05 11:31             ` Burakov, Anatoly
2019-11-05 11:41               ` Ananyev, Konstantin
2019-11-06 10:37                 ` Burakov, Anatoly
2019-11-08  3:19                   ` Yasufumi Ogawa
2019-11-13 21:43     ` [dpdk-dev] [PATCH v7 0/1] " yasufum.o
2019-11-13 21:43       ` [dpdk-dev] [PATCH v7 1/1] " yasufum.o
2019-11-14 10:01         ` Burakov, Anatoly
2019-11-14 11:42           ` Yasufumi Ogawa
2019-11-14 12:27             ` David Marchand
2019-11-26 19:40               ` Yasufumi Ogawa
2019-11-27 10:26                 ` Burakov, Anatoly
2019-11-29  5:44                   ` Yasufumi Ogawa
2019-12-02 10:43                     ` Burakov, Anatoly
2019-12-05 20:13                       ` Yasufumi Ogawa
2019-11-14 12:55         ` David Marchand
2019-11-14 17:32         ` Ananyev, Konstantin
2019-11-27  8:48       ` [dpdk-dev] [PATCH v8 0/1] " Yasufumi Ogawa
2019-11-27  8:48         ` [dpdk-dev] [PATCH v8 1/1] " Yasufumi Ogawa
2019-12-06 10:44           ` Burakov, Anatoly
2019-12-06 13:18             ` Yasufumi Ogawa
2020-02-14  7:46             ` Yasufumi Ogawa
2020-02-14 15:08               ` David Marchand
2020-02-14 15:29                 ` Thomas Monjalon
2020-02-17 12:54                   ` Yasufumi Ogawa
2023-06-13 16:51 ` [dpdk-dev] [PATCH] fbarray: get fbarrays from containerized secondary Stephen Hemminger

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