This serie is a proposal to slighly optimize the memory needed for some
structures used in nvme.
This follows the discussion in [1].
Honnestly, I'm not convinced that this serie really brings semething.
Because of the way memory alocation works, and its over-allocation to try to
avoid memory fragmentation, some limited gains are most of the time useless.
It could still help:
- many holes in structure can, at some point, have its size reach a threshold
(this is specially true if such structures are allocated with kcalloc() or
kmalloc_array())
- it can save some space in some other structures if embedded in them
- it can save a few cycles if the structure is memcpy()'ed or zeroed, for
example
- can reduce cache usage
With that in mind, patch 3 is a win, patch 4 is likely a win, the other ones are
much more theorical.
The changes are really limited, so even if the gain is marginal, maybe it still
makes sense to merge them.
Don't see why not, given they make do the structures smaller.
Reviewed-by: Sagi Grimberg <sagi@xxxxxxxxxxx>
