Robin Getz <[email protected]> writes:
> The buddy system allocates things in power of 2 pages sizes (4k, 8k,
> 16k, 32k, 64k, 128k, 256k, 512k, 1024k), which works fine on most
> systems, but an embedded system, which is running without a MMU (
> Memory Management Unit) - RAM is precious, and when you only need
> 129k for an application, you don't want to allocate a power of 2,
> which gives you 256k - an extra 127k, which can't be used by
> anything else.
In 2.4 I solved this problem at some point by just returning
the excess pages to the buddy allocator. There was even
a nice function to do this (alloc_exact)
That won't work for slab, but does for __get_free_pages() which
is better for large allocations anyways. slab imho doesn't make
sense for allocation anywhere bigger PAGE_SIZE/2. At some
point in 2.6 there was trouble with "compound pages" but I think
that has been resolved.
Just implementing alloc_exact again would be the simplest solution
for your problem.
-Andi
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