On Fri, 9 Aug 2002, Daniel Phillips wrote:
> >
> > Note that even active defrag won't be able to handle the case where you
> > want have lots of big pages, consituting a large percentage of available
> > memory.
>
> Perhaps I'm missing something, but I don't see why.
The statistics are against you. rmap won't help at all with all the other
kernel allocations, and the dcache/icache is often large, and on big
machines while there may be tens of thousands of idle entries, there will
also be hundreds of _non_idle entries that you can't just remove.
> Slab allocations would not have GFP_DEFRAG (I mistakenly wrote GFP_LARGE
> earlier) and so would be allocated outside ZONE_LARGE.
.. at which poin tyou then get zone balancing problems.
Or we end up with the same kind of special zone that we have _anyway_ in
the current large-page patch, in which case the point of doing this is
what?
Linus
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This archive was generated by hypermail 2b29 : Thu Aug 15 2002 - 22:00:20 EST