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malloc_trim(3)
MALLOC_TRIM(3) Linux Programmer's Manual MALLOC_TRIM(3)
NAME
malloc_trim - release free memory from the heap
SYNOPSIS
#include <malloc.h>
int malloc_trim(size_t pad);
DESCRIPTION
The malloc_trim() function attempts to release free memory from the
heap (by calling sbrk(2) or madvise(2) with suitable arguments).
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).
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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
allbox; lb lb lb l l l. Interface Attribute Value T{ malloc_trim()
T} Thread safety MT-Safe
CONFORMING TO
This function is a GNU extension.
NOTES
This function is automatically called by free(3) in certain circum‐
stances; see the discussion of M_TOP_PAD and M_TRIM_THRESHOLD in mal‐
lopt(3).
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.
SEE ALSO
sbrk(2), malloc(3), mallopt(3)
COLOPHON
This page is part of release 5.02 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 2019-05-09 MALLOC_TRIM(3)