On Wed, May 19, 2010 at 13:40, David Woodhouse <dwmw2@xxxxxxxxxxxxx> wrote:
> On Wed, 2010-05-19 at 13:32 +0200, Geert Uytterhoeven wrote:
>> Instead of having (different) defaults in sl[aou]b, perhaps we should
>> just remove the defaults completely, to ensure all architectures set
>> ARCH_SLAB_MINALIGN to the correct value?
>
> What is 'correct'? The architecture sets it to the minimum value that it
> can cope with, according to its own alignment constraints (and DMA/cache
> constraints, in the case of ARCH_KMALLOC_MINALIGN).
>
> Some architectures don't _have_ any minimum required alignment, so they
> have no need to set it. If the architecture _does_ specify a minimum,
> the allocators must honour it. Otherwise, they're free to do their own
> thing. And slob chooses to use a smaller alignment than slab and slub
> do, in accordance with its design and its raison d'être.
Currently 7 out of 20+ architectures set it.
Any bets on how many are missing, but should set it?
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
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