config/kernel-shrink.m4

   1 dnl #
   2 dnl # 3.1 API change
   3 dnl # The super_block structure now stores a per-filesystem shrinker.
   4 dnl # This interface is preferable because it can be used to specifically
   5 dnl # target only the zfs filesystem for pruning.
   6 dnl #
   7 AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK], [
   8         ZFS_LINUX_TEST_SRC([super_block_s_shrink], [
   9                 #include <linux/fs.h>
  10
  11                 static const struct super_block
  12                     sb __attribute__ ((unused)) = {
  13                         .s_shrink.seeks = DEFAULT_SEEKS,
  14                         .s_shrink.batch = 0,
  15                 };
  16         ],[])
  17 ])
  18
  19 dnl #
  20 dnl # 6.7 API change
  21 dnl # s_shrink is now a pointer.
  22 dnl #
  23 AC_DEFUN([ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK_PTR], [
  24         ZFS_LINUX_TEST_SRC([super_block_s_shrink_ptr], [
  25                 #include <linux/fs.h>
  26                 static unsigned long shrinker_cb(struct shrinker *shrink,
  27                     struct shrink_control *sc) { return 0; }
  28                 static struct shrinker shrinker = {
  29                         .count_objects = shrinker_cb,
  30                         .scan_objects = shrinker_cb,
  31                         .seeks = DEFAULT_SEEKS,
  32                 };
  33                 static const struct super_block
  34                     sb __attribute__ ((unused)) = {
  35                         .s_shrink = &shrinker,
  36                 };
  37         ],[])
  38 ])
  39
  40 AC_DEFUN([ZFS_AC_KERNEL_SUPER_BLOCK_S_SHRINK], [
  41         AC_MSG_CHECKING([whether super_block has s_shrink])
  42         ZFS_LINUX_TEST_RESULT([super_block_s_shrink], [
  43                 AC_MSG_RESULT(yes)
  44                 AC_DEFINE(HAVE_SUPER_BLOCK_S_SHRINK, 1,
  45                         [have super_block s_shrink])
  46         ],[
  47                 AC_MSG_RESULT(no)
  48                 AC_MSG_CHECKING([whether super_block has s_shrink pointer])
  49                 ZFS_LINUX_TEST_RESULT([super_block_s_shrink_ptr], [
  50                         AC_MSG_RESULT(yes)
  51                         AC_DEFINE(HAVE_SUPER_BLOCK_S_SHRINK_PTR, 1,
  52                                 [have super_block s_shrink pointer])
  53                 ],[
  54                         AC_MSG_RESULT(no)
  55                         ZFS_LINUX_TEST_ERROR([sb->s_shrink()])
  56                 ])
  57         ])
  58 ])
  59
  60 dnl #
  61 dnl # 3.12 API change
  62 dnl # The nid member was added to struct shrink_control to support
  63 dnl # NUMA-aware shrinkers.
  64 dnl #
  65 AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID], [
  66         ZFS_LINUX_TEST_SRC([shrink_control_nid], [
  67                 #include <linux/fs.h>
  68         ],[
  69                 struct shrink_control sc __attribute__ ((unused));
  70                 unsigned long scnidsize __attribute__ ((unused)) =
  71                     sizeof(sc.nid);
  72         ])
  73 ])
  74
  75 AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID], [
  76         AC_MSG_CHECKING([whether shrink_control has nid])
  77         ZFS_LINUX_TEST_RESULT([shrink_control_nid], [
  78                 AC_MSG_RESULT(yes)
  79                 AC_DEFINE(SHRINK_CONTROL_HAS_NID, 1,
  80                     [struct shrink_control has nid])
  81         ],[
  82                 AC_MSG_RESULT(no)
  83         ])
  84 ])
  85
  86 AC_DEFUN([ZFS_AC_KERNEL_SRC_REGISTER_SHRINKER_VARARG], [
  87         ZFS_LINUX_TEST_SRC([register_shrinker_vararg], [
  88                 #include <linux/mm.h>
  89                 static unsigned long shrinker_cb(struct shrinker *shrink,
  90                     struct shrink_control *sc) { return 0; }
  91         ],[
  92                 struct shrinker cache_shrinker = {
  93                         .count_objects = shrinker_cb,
  94                         .scan_objects = shrinker_cb,
  95                         .seeks = DEFAULT_SEEKS,
  96                 };
  97                 register_shrinker(&cache_shrinker, "vararg-reg-shrink-test");
  98         ])
  99 ])
 100
 101 AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK], [
 102         ZFS_LINUX_TEST_SRC([shrinker_cb_shrink_control], [
 103                 #include <linux/mm.h>
 104                 static int shrinker_cb(struct shrinker *shrink,
 105                     struct shrink_control *sc) { return 0; }
 106         ],[
 107                 struct shrinker cache_shrinker = {
 108                         .shrink = shrinker_cb,
 109                         .seeks = DEFAULT_SEEKS,
 110                 };
 111                 register_shrinker(&cache_shrinker);
 112         ])
 113
 114         ZFS_LINUX_TEST_SRC([shrinker_cb_shrink_control_split], [
 115                 #include <linux/mm.h>
 116                 static unsigned long shrinker_cb(struct shrinker *shrink,
 117                     struct shrink_control *sc) { return 0; }
 118         ],[
 119                 struct shrinker cache_shrinker = {
 120                         .count_objects = shrinker_cb,
 121                         .scan_objects = shrinker_cb,
 122                         .seeks = DEFAULT_SEEKS,
 123                 };
 124                 register_shrinker(&cache_shrinker);
 125         ])
 126 ])
 127
 128 dnl #
 129 dnl # 6.7 API change
 130 dnl # register_shrinker has been replaced by shrinker_register.
 131 dnl #
 132 AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER_REGISTER], [
 133         ZFS_LINUX_TEST_SRC([shrinker_register], [
 134                 #include <linux/shrinker.h>
 135                 static unsigned long shrinker_cb(struct shrinker *shrink,
 136                     struct shrink_control *sc) { return 0; }
 137         ],[
 138                 struct shrinker cache_shrinker = {
 139                         .count_objects = shrinker_cb,
 140                         .scan_objects = shrinker_cb,
 141                         .seeks = DEFAULT_SEEKS,
 142                 };
 143                 shrinker_register(&cache_shrinker);
 144         ])
 145 ])
 146
 147 AC_DEFUN([ZFS_AC_KERNEL_SHRINKER_CALLBACK],[
 148         dnl #
 149         dnl # 6.0 API change
 150         dnl # register_shrinker() becomes a var-arg function that takes
 151         dnl # a printf-style format string as args > 0
 152         dnl #
 153         AC_MSG_CHECKING([whether new var-arg register_shrinker() exists])
 154         ZFS_LINUX_TEST_RESULT([register_shrinker_vararg], [
 155                 AC_MSG_RESULT(yes)
 156                 AC_DEFINE(HAVE_REGISTER_SHRINKER_VARARG, 1,
 157                     [register_shrinker is vararg])
 158
 159                 dnl # We assume that the split shrinker callback exists if the
 160                 dnl # vararg register_shrinker() exists, because the latter is
 161                 dnl # a much more recent addition, and the macro test for the
 162                 dnl # var-arg version only works if the callback is split
 163                 AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
 164                         [cs->count_objects exists])
 165         ],[
 166                 AC_MSG_RESULT(no)
 167                 dnl #
 168                 dnl # 3.0 - 3.11 API change
 169                 dnl # cs->shrink(struct shrinker *, struct shrink_control *sc)
 170                 dnl #
 171                 AC_MSG_CHECKING([whether new 2-argument shrinker exists])
 172                 ZFS_LINUX_TEST_RESULT([shrinker_cb_shrink_control], [
 173                         AC_MSG_RESULT(yes)
 174                         AC_DEFINE(HAVE_SINGLE_SHRINKER_CALLBACK, 1,
 175                                 [new shrinker callback wants 2 args])
 176                 ],[
 177                         AC_MSG_RESULT(no)
 178
 179                         dnl #
 180                         dnl # 3.12 API change,
 181                         dnl # cs->shrink() is logically split in to
 182                         dnl # cs->count_objects() and cs->scan_objects()
 183                         dnl #
 184                         AC_MSG_CHECKING(
 185                             [whether cs->count_objects callback exists])
 186                         ZFS_LINUX_TEST_RESULT(
 187                             [shrinker_cb_shrink_control_split],[
 188                                 AC_MSG_RESULT(yes)
 189                                 AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK, 1,
 190                                     [cs->count_objects exists])
 191                         ],[
 192                                 AC_MSG_RESULT(no)
 193
 194                                 AC_MSG_CHECKING(
 195                                     [whether shrinker_register exists])
 196                                 ZFS_LINUX_TEST_RESULT([shrinker_register], [
 197                                         AC_MSG_RESULT(yes)
 198                                         AC_DEFINE(HAVE_SHRINKER_REGISTER, 1,
 199                                             [shrinker_register exists])
 200
 201                                         dnl # We assume that the split shrinker
 202                                         dnl # callback exists if
 203                                         dnl # shrinker_register() exists,
 204                                         dnl # because the latter is a much more
 205                                         dnl # recent addition, and the macro
 206                                         dnl # test for shrinker_register() only
 207                                         dnl # works if the callback is split
 208                                         AC_DEFINE(HAVE_SPLIT_SHRINKER_CALLBACK,
 209                                             1, [cs->count_objects exists])
 210                                 ],[
 211                                         AC_MSG_RESULT(no)
 212                                         ZFS_LINUX_TEST_ERROR([shrinker])
 213                                 ])
 214                         ])
 215                 ])
 216         ])
 217 ])
 218
 219 dnl #
 220 dnl # 2.6.39 API change,
 221 dnl # Shrinker adjust to use common shrink_control structure.
 222 dnl #
 223 AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT], [
 224         ZFS_LINUX_TEST_SRC([shrink_control_struct], [
 225                 #include <linux/mm.h>
 226         ],[
 227                 struct shrink_control sc __attribute__ ((unused));
 228
 229                 sc.nr_to_scan = 0;
 230                 sc.gfp_mask = GFP_KERNEL;
 231         ])
 232 ])
 233
 234 AC_DEFUN([ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT], [
 235         AC_MSG_CHECKING([whether struct shrink_control exists])
 236         ZFS_LINUX_TEST_RESULT([shrink_control_struct], [
 237                 AC_MSG_RESULT(yes)
 238                 AC_DEFINE(HAVE_SHRINK_CONTROL_STRUCT, 1,
 239                     [struct shrink_control exists])
 240         ],[
 241                 ZFS_LINUX_TEST_ERROR([shrink_control])
 242         ])
 243 ])
 244
 245 AC_DEFUN([ZFS_AC_KERNEL_SRC_SHRINKER], [
 246         ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK
 247         ZFS_AC_KERNEL_SRC_SUPER_BLOCK_S_SHRINK_PTR
 248         ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_HAS_NID
 249         ZFS_AC_KERNEL_SRC_SHRINKER_CALLBACK
 250         ZFS_AC_KERNEL_SRC_SHRINK_CONTROL_STRUCT
 251         ZFS_AC_KERNEL_SRC_REGISTER_SHRINKER_VARARG
 252         ZFS_AC_KERNEL_SRC_SHRINKER_REGISTER
 253 ])
 254
 255 AC_DEFUN([ZFS_AC_KERNEL_SHRINKER], [
 256         ZFS_AC_KERNEL_SUPER_BLOCK_S_SHRINK
 257         ZFS_AC_KERNEL_SHRINK_CONTROL_HAS_NID
 258         ZFS_AC_KERNEL_SHRINKER_CALLBACK
 259         ZFS_AC_KERNEL_SHRINK_CONTROL_STRUCT
 260 ])