mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-21 20:40:05 +00:00
0f982c1827
This patch adds support huge page support on main arena allocation, enable with tunable glibc.malloc.hugetlb=2. The patch essentially disable the __glibc_morecore() sbrk() call (similar when memory tag does when sbrk() call does not support it) and fallback to default page size if the memory allocation fails. Checked on x86_64-linux-gnu. Reviewed-by: DJ Delorie <dj@redhat.com>
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/* Copyright (C) 1991-2021 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
static bool __always_fail_morecore = false;
|
|
|
|
/* Allocate INCREMENT more bytes of data space,
|
|
and return the start of data space, or NULL on errors.
|
|
If INCREMENT is negative, shrink data space. */
|
|
void *
|
|
__glibc_morecore (ptrdiff_t increment)
|
|
{
|
|
if (__always_fail_morecore)
|
|
return NULL;
|
|
|
|
void *result = (void *) __sbrk (increment);
|
|
if (result == (void *) -1)
|
|
return NULL;
|
|
|
|
return result;
|
|
}
|
|
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
|
|
compat_symbol (libc, __glibc_morecore, __default_morecore, GLIBC_2_0);
|
|
#endif
|