Alan Cox wrote:
We've abstract the DMA mapping/SG list handling enough that the
block size should make no more difference than it does for the
MTU size of a network.
You need to start managing groups of pages in the vm and keeping them
together and writing them out together and paging them together even if
one of them is dirty and the other isn't. You have to deal with cases
where a process forks and the two pages are dirtied one in each but still
have to be written together.
Alternatively you go for read-modify-write (nasty performance hit
especially for RAID or a log structured fs).
Or just ignore the extra length, thereby excising the 'read-modify'
step... Total storage is halved or worse, but you don't take as much of
a performance hit.
Jeff
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