Packing data in kernel memory

[John Richard Moser]

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Is there a way to pack and store arbitrary data in the kernel, or do I
need to roll my own?

As a simple example, let's say I wanted to store 8 elements.  Assume
PAGE_SIZE is 4.  If I store these individually, their size and use is:

ELEM      SIZE    PAGES    USE
[A.]      4        1        4
[B...]    6        2        8
[C]       3        1        4
[D....]   7        2        8
[E]       3        1        4
[F.]      4        1        4
[G......] 9        3       12
[H.....]  8        2        8

TOTAL    44       13       52

2 excess pages, 8 excess units of memory wasted.

Now let's say I used groups of 4 pages:

E                 S   P   U
[A.][H.....]      12   4  16
[B...][C][D....]  16   4  16
[E][F.][G......]  16   4  16
                  44  12  48

1 excess pages, 4 units wasted memory.
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