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Re: uarea swap-out
matthew green <mrg%eterna.com.au@localhost> wrote:
> i'm really curious how this affects platforms with very
> few hardware pages, like acorn26.
I cannot measure that empirically, therefore CC'ing port-acorn26 and
port-acorn32 lists. There are few points regarding this:
- Merge of lwp_cache and uarea (it puts struct lwp, pcb and kstack together)
should have positive effect i.e. it would increase the utilisation of pages.
- The criteria when LWP can be swapped-out is relatively strict i.e. there
are already many states when it cannot, see swappable() in uvm_glue.c.
- If your machine starts swapping uareas, I think it is already quite a
hammer, especially for machines like acorn26/32.
Newer patch removing uarea swap-out:
By the way, patch cuts ~4k from amd64 kernel size.
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