Section (3) malloc_trim
malloc_trim — release free memory from the heap
specifies the amount of free space to leave untrimmed at the
top of the heap. If this argument is 0, only the minimum
amount of memory is maintained at the top of the heap (i.e.,
one page or less). A nonzero argument can be used to maintain
some trailing space at the top of the heap in order to allow
future allocations to be made without having to extend the
heap with sbrk(2).
returns 1 if memory was actually released back to the system,
or 0 if it was not possible to release any memory.
For an explanation of the terms used in this section, see attributes(7).
Only the main heap (using sbrk(2)) honors the
pad argument; thread
heaps do not.
Since glibc 2.8 this function frees memory in all arenas and in all chunks with whole free pages.
Before glibc 2.8 this function only freed memory at the top of the heap in the main arena.
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