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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.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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static bool __always_fail_morecore = false;
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/* Allocate INCREMENT more bytes of data space,
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and return the start of data space, or NULL on errors.
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If INCREMENT is negative, shrink data space. */
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void *
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__glibc_morecore (ptrdiff_t increment)
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{
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if (__always_fail_morecore)
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return NULL;
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void *result = (void *) __sbrk (increment);
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if (result == (void *) -1)
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return NULL;
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return result;
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}
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#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
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compat_symbol (libc, __glibc_morecore, __default_morecore, GLIBC_2_0);
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#endif
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