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# Copyright (C) 2016-2022 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/>.
# Allowed attributes for tunables:
#
# type: Defaults to STRING
# minval: Optional minimum acceptable value
# maxval: Optional maximum acceptable value
# env_alias: An alias environment variable
# security_level: Specify security level of the tunable for AT_SECURE binaries.
# Valid values are:
#
# SXID_ERASE: (default) Do not read and do not pass on to
# child processes.
# SXID_IGNORE: Do not read, but retain for non-AT_SECURE
# subprocesses.
# NONE: Read all the time.
glibc {
malloc {
check {
type: INT_32
minval: 0
maxval: 3
env_alias: MALLOC_CHECK_
}
top_pad {
type: SIZE_T
env_alias: MALLOC_TOP_PAD_
security_level: SXID_IGNORE
}
perturb {
type: INT_32
minval: 0
maxval: 0xff
env_alias: MALLOC_PERTURB_
security_level: SXID_IGNORE
}
mmap_threshold {
type: SIZE_T
env_alias: MALLOC_MMAP_THRESHOLD_
security_level: SXID_IGNORE
}
trim_threshold {
type: SIZE_T
env_alias: MALLOC_TRIM_THRESHOLD_
security_level: SXID_IGNORE
}
mmap_max {
type: INT_32
env_alias: MALLOC_MMAP_MAX_
security_level: SXID_IGNORE
minval: 0
}
arena_max {
type: SIZE_T
env_alias: MALLOC_ARENA_MAX
minval: 1
security_level: SXID_IGNORE
}
arena_test {
type: SIZE_T
env_alias: MALLOC_ARENA_TEST
minval: 1
security_level: SXID_IGNORE
}
tcache_max {
type: SIZE_T
}
tcache_count {
type: SIZE_T
}
tcache_unsorted_limit {
type: SIZE_T
}
mxfast {
type: SIZE_T
minval: 0
security_level: SXID_IGNORE
}
hugetlb {
type: SIZE_T
minval: 0
}
}
cpu {
hwcap_mask {
type: UINT_64
env_alias: LD_HWCAP_MASK
default: HWCAP_IMPORTANT
}
}
elision {
enable {
type: INT_32
minval: 0
maxval: 1
}
skip_lock_busy {
type: INT_32
default: 3
minval: 0
}
skip_lock_internal_abort {
type: INT_32
default: 3
minval: 0
}
skip_lock_after_retries {
type: INT_32
default: 3
minval: 0
}
tries {
type: INT_32
default: 3
minval: 0
}
skip_trylock_internal_abort {
type: INT_32
default: 3
minval: 0
}
}
rtld {
nns {
type: SIZE_T
minval: 1
maxval: 16
default: 4
}
optional_static_tls {
type: SIZE_T
minval: 0
default: 512
}
}
mem {
tagging {
type: INT_32
minval: 0
maxval: 255
security_level: SXID_IGNORE
}
}
rtld {
dynamic_sort {
type: INT_32
minval: 1
maxval: 2
default: 2
}
}
}
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