>of the "leak" is using valgrind, but valgrind only sees 24MB 
>of "possibly lost" memory.
For what concerns the possibly lost, a bug has been recently
fixed in 3.6.0 SVN. Before this fix, memcheck was giving a lot of
"false possibly lost". 
See http://bugs.kde.org/show_bug.cgi?id=206600



>leaking), how could I force the OS to see that the memory 
>usage is back to a regular level ?

On most OS (and at least on gnu/linux), libc malloc/free does not return
(all of) the memory to the Operating System after free.
Only big blocks are specially handled and are "fully" returned to the OS
when free
is called : big blocks are allocated using mmap, while smaller blocks
are
allocated using brk.
(you might look at http://bugs.kde.org/show_bug.cgi?id=250101
 which somewhat explores this in the framework of huge "unused" memory
 under valgrind).

To my knowledge, there is nothing that can force to decrease the size
of the "brk allocated" region used by malloc.

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