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glibc's malloc is very bad about returning memory from the kernel, add a call

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to its malloc_trim to prompt it to do so. Reported by Sarunas Valaskevicius.
This commit is contained in:
Nicholas Marriott
2020-10-06 08:18:42 +01:00
parent 847a061e31
commit 680e7a382f
3 changed files with 32 additions and 0 deletions
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25
configure.ac
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@@ -328,6 +328,31 @@ AC_SEARCH_LIBS(inet_ntoa, nsl)
AC_SEARCH_LIBS(socket, socket)
AC_CHECK_LIB(xnet, socket)
# Check if using glibc and have malloc_trim(3). The glibc free(3) is pretty bad
# about returning memory to the kernel unless the application tells it when to
# with malloc_trim(3).
AC_MSG_CHECKING(if free doesn't work very well)
AC_LINK_IFELSE([AC_LANG_SOURCE(
[
#include <stdlib.h>
#ifdef __GLIBC__
#include <malloc.h>
int main(void) {
malloc_trim (0);
exit(0);
}
#else
no
#endif
])],
found_malloc_trim=yes,
found_malloc_trim=no
)
AC_MSG_RESULT($found_malloc_trim)
if test "x$found_malloc_trim" = xyes; then
AC_DEFINE(HAVE_MALLOC_TRIM)
fi
# Check for CMSG_DATA. On some platforms like HP-UX this requires UNIX 95
# (_XOPEN_SOURCE and _XOPEN_SOURCE_EXTENDED) (see xopen_networking(7)). On
# others, UNIX 03 (_XOPEN_SOURCE 600, see standards(7) on Solaris).