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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | VERSIONS | NOTES | SEE ALSO | COLOPHON |
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malloc_trim(3) Library Functions Manual malloc_trim(3)
malloc_trim - release free memory from the heap
Standard C library (libc, -lc)
#include <malloc.h>
int malloc_trim(size_t pad);
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).
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 │
└─────────────────────────────────────┴───────────────┴─────────┘
GNU.
glibc 2.0.
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.
sbrk(2), malloc(3), mallopt(3)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
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⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2024-06-26. If you discover any rendering problems in this HTML
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man-pages@man7.org
Linux man-pages 6.9.1 2024-05-02 malloc_trim(3)
Pages that refer to this page: mallinfo(3), malloc(3), mallopt(3), sd_event_add_memory_pressure(3)
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