Speedup for GMemChunks (Bug#169389)

[Andreas Rottmann <a rottmann gmx at>]

Hi!

I just created Bug#169389, which is a little patch to improve
performance of GMemChunks:

The attached patch, while retaining ABI/API, adds a configure option
(enabled by default) which enables the use of posix_memalign(), if
available on the system, by the memchunk code. This speeds up
G_ALLOC_AND_FREE memchunks; on my system, memchunks were outperformed
by glibc's malloc/free before applying the patch; after applying the
patch, memchunks are a faster. A simple benchmark is included in the
patch.

Note that this is only a first version of the patch, and it certainly
can be improved a bit stylistic-wise (e.g. reducing the number of
#ifdefs).

I think this is somewhat related to Bug#18653 (Add GFreeList,
deprecate GMemChunk); I think GMemChunks might still be useful, since
they allow the memory to eventually freed again.

Thoughts?

Rotty
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