|| Linux Programmer's Manual
NAME malloc_trim - release free memory from the top of the heap
() function attempts to release free memory at the top of the heap (by calling
(2) with a suitable argument).
argument 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
RETURN VALUE The
malloc_trim() function returns 1 if memory was actually released back to the system, or 0 if it was not possible to release any memory.
ERRORS No errors are defined.
CONFORMING TO This function is a GNU extension.
This function is automatically called by
(3) in certain circumstances; see the discussion of
This function cannot release free memory located at places other than the top of the heap.
This function releases only memory in the main arena.
COLOPHON This page is part of release 3.53 of the Linux
man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.