Hello,
I think there was a misunderstanding - I was not talking about wasted
RAM at all. The point was that currently, memalign is not included in
the build at all, it is removed by linker as unused code (if the build
is configured to do so.) If the linker cannot remove it, the image size
increases by more than 1% of total program (flash) memory.
But to reiterate - if the change described in your first option only
affects things when mmap is actually in use (which, as Xiang Xiao said,
is rare), then it should be fine from 8bit AVR standpoint. The linker
will remove mmap for most use cases anyway and, in turn, remove memalign
as well, resulting in no overall code size increase.
(On a side note, to my knowledge there is no concept of pages in 8bit
AVR and there is no need in the hardware to make aligned allocations at
all so it is somewhat likely that mm_memalign could simply be replaced
by a macro that calls mm_malloc. But that is off-topic for this thread.)
On 2026-10-10 01:54, Marco C. wrote:
Hello,
The page alignment in 8-bit AVR is **2 bytes**.
I don't think it hurts that much.
What do you think?
Marco Casaroli
