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From: Yasufumi Ogawa <yasufum.o@gmail.com>
To: "Burakov, Anatoly" <anatoly.burakov@intel.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 18:37:55 +0900
Message-ID: <4e4ad489-7b1e-9406-4871-4a3ae7f318ee@gmail.com> (raw)
In-Reply-To: <35081f35-1967-93cb-096c-08761ed2658d@intel.com>

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.

 >> 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().

Thanks,
Yasufumi


  reply index

Thread overview: 69+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-16  1:59 [dpdk-dev] [PATCH] " ogawa.yasufumi
2019-04-16  1:59 ` ogawa.yasufumi
2019-04-16  3:43 ` [dpdk-dev] [PATCH v2 0/1] Get " ogawa.yasufumi
2019-04-16  3:43   ` ogawa.yasufumi
2019-04-16  3:43   ` [dpdk-dev] [PATCH v2 1/1] fbarray: get " ogawa.yasufumi
2019-04-16  3:43     ` 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 [this message]
2019-07-11  9:43               ` Burakov, Anatoly
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

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