Could someone tell me if the fastmap feature in ubi is stable for use in production?

[Wang, Qiong (Q.)]

Hi Richard,

Thank you so much for your information. Our plan is to use it but with all means of test. We will look into the patch that you showed to us and decide if we can add it in our project.

Thanks again.

Best Regards,
汪琼/Wang Qiong

软件与测试部/软件工程师Software Design&Test Dept./Software Engineer
Tel +86 25 8106 9232
E-mail: qwang34 at yfve.com.cn
延锋伟世通电子科技（南京）有限公司
Yanfeng Visteon Electronics Technology (Nanjing) Co., Ltd
江苏省南京市江宁区苏源大道19号国际企业总部园C1座7楼
Address: 7F, C1, Jiulonghu International Corporate Headquarters, No. 19 Suyuan Road, Jiangning Development Zone, Nanjing, China


-----Original Message-----
From: Richard Weinberger [mailto:richard.weinberger at gmail.com] 
Sent: 2018年4月9日 18:56
To: Wang, Qiong (Q.)
Cc: linux-mtd at lists.infradead.org
Subject: Re: Could someone tell me if the fastmap feature in ubi is stable for use in production?

Wang, Qiong (Q.),

On Mon, Apr 9, 2018 at 12:25 PM, Wang, Qiong (Q.) <qwang34 at yfve.com.cn> wrote:
> Hi experts,
>
> I have found the below link in the linux-mtd website explaining fastmap feature in ubi.
> http://linux-mtd.infradead.org/doc/ubi.html#L_fastmap
>
> Our project uses large nand flash and I found that fastmap can reduce the ubi attach process to the time we want. Our concern is, since it is an experimental, is it stable to use in our project? Are there any reported issue of this feature?Our biggest worry is that can it possibly brick our system during the boot up process.

Well, it is a non-trvial aggressive optimization.
Lately I planned to mark it finally as stable but then this happened popped up.

[0] http://lists.infradead.org/pipermail/linux-mtd/2018-March/079610.html

On the other hand, if only very few people are using it, we won't find remaining subtle bugs.

--
Thanks,
//richard