[U-Boot] [RFC PATCH 1/2] add block device cache

[Stephen Warren <swarren@wwwdotorg.org>]

On 03/17/2016 03:33 PM, Eric Nelson wrote:
> Thanks for the review(s) Stephen.
>
> On 03/17/2016 02:16 PM, Stephen Warren wrote:
>> On 03/16/2016 03:40 PM, Eric Nelson wrote:
>>> Signed-off-by: Eric Nelson <eric@nelint.com>
>>
>> A patch description would be useful here; the cover letter wouldn't be
>> checked in.
>>
>
> Yeah. Please hote the RFC.
>
> I was really hoping for some broader feedback about whether this
> is a better approach than the more specialized ext4 extent cache.
>
> If I can get an ack on the approach, I think a minimal block
> device cache would support at least 2 or 4 entries, and I'd
> need to be able to answer the questions from your other
> response:
>
>> Do you have any stats on how many operations this saves for typical FS operations such as:
>>
>> - Partition table type identification (with various types such as MBR/DOS, GPT, ...)
>> - Partition enumeration
>> - Filesystem identification (with various filesystems such as FAT, ext, ...)
>> - File reads
>
> Should I interpret this as support of a small(ish) block device cache?

Conceptually I think it sounds OK provided it yields some demonstrable 
improvement across a variety of use-cases, and the design doesn't 
prevent it addressing obvious other cases it should address.

You probably want to Cc (or hope they see this and provide feedback 
anyway) a few other people such as Tom Rini, Simon Glass, Marek Vasut, etc.