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malloc_trim — release free memory from the top of the heap
#include <malloc.h>
void
malloc_trim( |
size_t pad); |
The malloc_trim() function
attempts to release free memory at the top of the heap (by
calling sbrk(2) with a suitable
argument).
The pad 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 sbrk(2).
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.
This function is automatically called by free(3) in certain
circumstances; see the discussion of M_TOP_PAD and M_TRIM_THRESHOLD in mallopt(3).
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.
This page is part of release 3.52 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/.
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t Copyright (c) 2012 by Michael Kerrisk <mtk.manpagesgmail.com> %%%LICENSE_START(VERBATIM) Permission is granted to make and distribute verbatim copies of this manual provided the copyright notice and this permission notice are preserved on all copies. Permission is granted to copy and distribute modified versions of this manual under the conditions for verbatim copying, provided that the entire resulting derived work is distributed under the terms of a permission notice identical to this one. Since the Linux kernel and libraries are constantly changing, this manual page may be incorrect or out-of-date. The author(s) assume no responsibility for errors or omissions, or for damages resulting from the use of the information contained herein. The author(s) may not have taken the same level of care in the production of this manual, which is licensed free of charge, as they might when working professionally. Formatted or processed versions of this manual, if unaccompanied by the source, must acknowledge the copyright and authors of this work. %%%LICENSE_END |