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NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON |
MALLOC_TRIM(3) Linux Programmer's Manual MALLOC_TRIM(3)
malloc_trim - release free memory from the top of the heap
#include <malloc.h>
int 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.
No errors are defined.
For an explanation of the terms used in this section, see
attributes(7).
┌──────────────┬───────────────┬─────────┐
│Interface │ Attribute │ Value │
├──────────────┼───────────────┼─────────┤
│malloc_trim() │ Thread safety │ MT-Safe │
└──────────────┴───────────────┴─────────┘
This function is a GNU extension.
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.
sbrk(2), malloc(3), mallopt(3)
This page is part of release 4.12 of the Linux man-pages project. A
description of the project, information about reporting bugs, and the
latest version of this page, can be found at
https://www.kernel.org/doc/man-pages/.
Linux 2015-07-23 MALLOC_TRIM(3)
Pages that refer to this page: mallinfo(3), malloc(3), mallopt(3)