elf/dl-tunables.list

   1 # Copyright (C) 2016-2024 Free Software Foundation, Inc.
   2 # This file is part of the GNU C Library.
   3
   4 # The GNU C Library is free software; you can redistribute it and/or
   5 # modify it under the terms of the GNU Lesser General Public
   6 # License as published by the Free Software Foundation; either
   7 # version 2.1 of the License, or (at your option) any later version.
   8
   9 # The GNU C Library is distributed in the hope that it will be useful,
  10 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12 # Lesser General Public License for more details.
  13
  14 # You should have received a copy of the GNU Lesser General Public
  15 # License along with the GNU C Library; if not, see
  16 # <https://www.gnu.org/licenses/>.
  17
  18 # Allowed attributes for tunables:
  19 #
  20 # type: Defaults to STRING
  21 # minval: Optional minimum acceptable value
  22 # maxval: Optional maximum acceptable value
  23 # default: Optional default value (if not specified it will be 0 or "")
  24 # env_alias: An alias environment variable
  25
  26 glibc {
  27   malloc {
  28     check {
  29       type: INT_32
  30       minval: 0
  31       maxval: 3
  32       env_alias: MALLOC_CHECK_
  33     }
  34     top_pad {
  35       type: SIZE_T
  36       env_alias: MALLOC_TOP_PAD_
  37       default: 131072
  38     }
  39     perturb {
  40       type: INT_32
  41       minval: 0
  42       maxval: 0xff
  43       env_alias: MALLOC_PERTURB_
  44     }
  45     mmap_threshold {
  46       type: SIZE_T
  47       env_alias: MALLOC_MMAP_THRESHOLD_
  48     }
  49     trim_threshold {
  50       type: SIZE_T
  51       env_alias: MALLOC_TRIM_THRESHOLD_
  52     }
  53     mmap_max {
  54       type: INT_32
  55       env_alias: MALLOC_MMAP_MAX_
  56       minval: 0
  57     }
  58     arena_max {
  59       type: SIZE_T
  60       env_alias: MALLOC_ARENA_MAX
  61       minval: 1
  62     }
  63     arena_test {
  64       type: SIZE_T
  65       env_alias: MALLOC_ARENA_TEST
  66       minval: 1
  67     }
  68     tcache_max {
  69       type: SIZE_T
  70     }
  71     tcache_count {
  72       type: SIZE_T
  73     }
  74     tcache_unsorted_limit {
  75       type: SIZE_T
  76     }
  77     mxfast {
  78       type: SIZE_T
  79       minval: 0
  80     }
  81     hugetlb {
  82       type: SIZE_T
  83       minval: 0
  84     }
  85   }
  86   cpu {
  87     hwcap_mask {
  88       type: UINT_64
  89       env_alias: LD_HWCAP_MASK
  90       default: HWCAP_IMPORTANT
  91     }
  92   }
  93
  94   elision {
  95     enable {
  96       type: INT_32
  97       minval: 0
  98       maxval: 1
  99     }
 100     skip_lock_busy {
 101       type: INT_32
 102       default: 3
 103       minval: 0
 104     }
 105     skip_lock_internal_abort {
 106       type: INT_32
 107       default: 3
 108       minval: 0
 109     }
 110     skip_lock_after_retries {
 111       type: INT_32
 112       default: 3
 113       minval: 0
 114     }
 115     tries {
 116       type: INT_32
 117       default: 3
 118       minval: 0
 119     }
 120     skip_trylock_internal_abort {
 121       type: INT_32
 122       default: 3
 123       minval: 0
 124     }
 125   }
 126
 127   rtld {
 128     nns {
 129       type: SIZE_T
 130       minval: 1
 131       maxval: 16
 132       default: 4
 133     }
 134     optional_static_tls {
 135       type: SIZE_T
 136       minval: 0
 137       default: 512
 138     }
 139     enable_secure {
 140       type: INT_32
 141       minval: 0
 142       maxval: 1
 143       default: 0
 144     }
 145   }
 146
 147   mem {
 148     tagging {
 149       type: INT_32
 150       minval: 0
 151       maxval: 255
 152     }
 153     decorate_maps {
 154       type: INT_32
 155       minval: 0
 156       maxval: 1
 157     }
 158   }
 159
 160   rtld {
 161     dynamic_sort {
 162       type: INT_32
 163       minval: 1
 164       maxval: 2
 165       default: 2
 166     }
 167   }
 168
 169   gmon {
 170     minarcs {
 171       type: INT_32
 172       minval: 50
 173       default: 50
 174     }
 175     maxarcs {
 176       type: INT_32
 177       minval: 50
 178       default: 1048576
 179     }
 180   }
 181 }