[linux-mm-cc] [OFFTOPIC] SD wear-levelling

[Stefan Monnier]

> SD cards support a bulk data transfer or "multiple block write"
> operation.  In this case, it is up to the OS file system driver,
> device driver and/or SD host  controller to buffer contiguous writes,
> and then stream the buffer to  the SD card with a multiple block write
> operation. For the most  efficient writes, you would want your
> multiple block writes to be  aligned with and the size of the erase
> block in the underlying  NAND -- something that the application
> committing data would need to be aware of.

Ah, now that makes sense.
So yes, it would be good to be able to tweak Linux's swap handling so it
tries to write in chunks that are erase-block sized and aligned, as far
as possible.  Tho maybe trying to just maximize the chunk size (without
paying particular attention to a particular size or alignment) would be
good enough.


        Stefan