Re: Hello list!

[gianluca <gianlucarenzi-RMR/+jklkADqD7ZJT3/+rDUZDU+1vuVT@public.gmane.org>]

On 02/12/2014 02:04 PM, Clemens Eisserer wrote:
> Hi Gianluca,
>
>> What about the wear-leveling of this configuration of the eMMC device?
>
> Actually nilfs2 is by design as friendly to flash devices with a weak
> controller as possible.
> It only performs sequential writes, yielding a perfectly equal
> distribution of writes across the device.
> Nilfs2 even overwrites static data which won't be written to when
> using other filesystems - which is great for devices supporting only
> dynamic wear leveling (usually SD, mmc, emmc, ...).
>

Ok. good news to me.

> However, there is one issue left - the (two) superblocks are written
> to periodically in short intervals.
> There is currently an ongoing discussion about this and Andreas has
> posted an experimental patch which works well on my raspberry pi.
>

What patch? Can you give some additional info? I am running kernel 
3.12.2 vanilla.

>> Can you point me on some tools, utilities to check out this issue?
>
> What I did to observe the write-patterns of various file-systems was
> to create a ram-disk using BUSE: https://github.com/acozzette/BUSE
> It delivers an example-program which can be modified to log each
> write-access, which I imported as CSV into LibreOffice for
> visualization.

can you explain better?

Regards,
-- 
            ,,,
           (o o)
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Gianluca Renzi
R&D
phone: +39.0542.609120
fax:   +39.0542.609212

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