Re: [PATCH v3] staging: writeboost: Add dm-writeboost

[Akira Hayakawa]

The size is configurable but typically 512KB (that's the default).

Refer to bio payload sounds really dangerous but it may be possible
in some tricky way. but at the moment I am not sure how the
implementation would be.

Is there some fancy function that is like memcpy but actually "move"
the ownership?

- Akira

On 2015/02/21 0:50, Joe Thornber wrote:
> On Sat, Feb 21, 2015 at 12:25:53AM +0900, Akira Hayakawa wrote:
>> Yes.
> How big are your log chunks?  Presumably they're relatively small (eg,
> 256k).  In which case you can optimise for the common case where you
> have enough bios to hand to build your log chunk by just referencing
> the bio payloads, rather than copying.  It's only the last bit of io
> in a burst that should be using this copying slow path.
>
> - Joe

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