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Disable multiple malloc arenas

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In our usecase, these are impossibly greedy because we often
free memory in a different thread than where we allocate, forcing
the default allocator to scatter the used memory all over the place.
This commit is contained in:
Maria Matejka 2024-12-14 23:21:07 +01:00
parent 2d7c8f4d5c
commit 792189e807
2 changed files with 10 additions and 0 deletions
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1
configure.ac
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@ -371,6 +371,7 @@ esac
AC_CHECK_HEADERS_ONCE([alloca.h syslog.h stdatomic.h])
AC_CHECK_HEADER([sys/mman.h], [AC_DEFINE([HAVE_MMAP], [1], [Define to 1 if mmap() is available.])], have_mman=no)
AC_CHECK_FUNC([aligned_alloc], [AC_DEFINE([HAVE_ALIGNED_ALLOC], [1], [Define to 1 if aligned_alloc() is available.])], have_aligned_alloc=no)
AC_CHECK_HEADER([malloc.h], [AC_DEFINE([HAVE_MALLOC_H], [1], [Define to 1 if malloc.h is available.])], have_malloc_h=no)
AC_CHECK_MEMBERS([struct sockaddr.sa_len], [], [], [#include <sys/socket.h>])
if test "$have_aligned_alloc" = "no" && test "$have_mman" = "no" ; then

9
sysdep/unix/alloc.c
View File

@ -18,6 +18,10 @@
#include <stdlib.h>
#include <unistd.h>
#ifdef HAVE_MALLOC_H
# include <malloc.h>
#endif
#ifdef HAVE_MMAP
# include <sys/mman.h>
#endif
@ -501,6 +505,11 @@ page_dump(struct dump_request *dreq)
void
resource_sys_init(void)
{
#ifdef HAVE_MALLOC_H
if (!mallopt(M_ARENA_MAX, 1))
log(L_WARN "Failed to disable multiple malloc arenas, memory consumption may skyrocket.");
#endif
#ifdef CONFIG_DISABLE_THP
/* Disable transparent huge pages, they do not work properly with madvice(MADV_DONTNEED) */
if (prctl(PR_SET_THP_DISABLE, (unsigned long) 1, (unsigned long) 0, (unsigned long) 0, (unsigned long) 0) < 0)