components/database/postgresql-16/patches/01-dism.patch

   1 On Solaris/illumos we want to use DISM or ISM e.g. Dynamic Intimate Shared Memory or Intimate Shared Memory
   2 which is available via sysv SHM only. This patch changes the default shared memory system to be sysv
   3 on Solaris/illumos based systems e.g. which have SHM_SHARE_MMU (which translates to ISM) and when SHM_PAGEABLE
   4 is defined in sys/shm.h we set the default PG_SHMAT_FLAGS to SHM_PAGEABLE which will lead to DISM being
   5 used. The patch to the postgresql.conf.sample is to show that sysv is the default for Solaris and the
   6 ordering is changed as by default it used to be mmap and posix for the defaults and you could always
   7 override things using the sysv setting.
   8
   9 --- postgresql-16.2/src/include/portability/mem.h.orig  2024-02-05 22:41:37.000000000 +0100
  10 +++ postgresql-16.2/src/include/portability/mem.h       2024-03-02 16:06:23.000890754 +0100
  11 @@ -14,11 +14,15 @@
  12
  13  #define IPCProtection  (0600)  /* access/modify by user only */
  14
  15 +#ifdef SHM_PAGEABLE                    /* use dynamic intimate shared memory on Solaris */
  16 +#define PG_SHMAT_FLAGS                 SHM_PAGEABLE
  17 +#else
  18  #ifdef SHM_SHARE_MMU                   /* use intimate shared memory on Solaris */
  19  #define PG_SHMAT_FLAGS                 SHM_SHARE_MMU
  20  #else
  21  #define PG_SHMAT_FLAGS                 0
  22  #endif
  23 +#endif
  24
  25  /* Linux prefers MAP_ANONYMOUS, but the flag is called MAP_ANON on other systems. */
  26  #ifndef MAP_ANONYMOUS
  27 --- postgresql-16.2/src/include/storage/pg_shmem.h.orig 2024-02-05 22:41:37.000000000 +0100
  28 +++ postgresql-16.2/src/include/storage/pg_shmem.h      2024-03-02 16:06:23.001219767 +0100
  29 @@ -70,7 +70,9 @@
  30  #endif
  31  extern PGDLLIMPORT void *UsedShmemSegAddr;
  32
  33 -#if !defined(WIN32) && !defined(EXEC_BACKEND)
  34 +#if defined(SHM_SHARE_MMU)
  35 +#define DEFAULT_SHARED_MEMORY_TYPE SHMEM_TYPE_SYSV
  36 +#elif !defined(WIN32) && !defined(EXEC_BACKEND)
  37  #define DEFAULT_SHARED_MEMORY_TYPE SHMEM_TYPE_MMAP
  38  #elif !defined(WIN32)
  39  #define DEFAULT_SHARED_MEMORY_TYPE SHMEM_TYPE_SYSV
  40 --- postgresql-16.2/src/include/storage/dsm_impl.h.orig 2024-02-05 22:41:37.000000000 +0100
  41 +++ postgresql-16.2/src/include/storage/dsm_impl.h      2024-03-02 16:06:23.001054296 +0100
  42 @@ -19,6 +19,13 @@
  43  #define DSM_IMPL_WINDOWS               3
  44  #define DSM_IMPL_MMAP                  4
  45
  46 +#ifdef HAVE_SYS_SHM_H
  47 + /*
  48 + * For SHM_SHARE_MMU.
  49 + */
  50 +#include <sys/shm.h>
  51 +#endif
  52 +
  53  /*
  54   * Determine which dynamic shared memory implementations will be supported
  55   * on this platform, and which one will be the default.
  56 @@ -34,6 +41,11 @@
  57  #define USE_DSM_SYSV
  58  #ifndef DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE
  59  #define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE             DSM_IMPL_SYSV
  60 +#else
  61 +#ifdef SHM_SHARE_MMU
  62 +#undef DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE
  63 +#define DEFAULT_DYNAMIC_SHARED_MEMORY_TYPE      DSM_IMPL_SYSV
  64 +#endif
  65  #endif
  66  #define USE_DSM_MMAP
  67  #endif
  68 --- postgresql-16.2/src/backend/utils/misc/postgresql.conf.sample.orig  2024-02-05 22:41:37.000000000 +0100
  69 +++ postgresql-16.2/src/backend/utils/misc/postgresql.conf.sample       2024-03-02 16:06:23.000657525 +0100
  70 @@ -144,16 +144,16 @@
  71  #autovacuum_work_mem = -1              # min 1MB, or -1 to use maintenance_work_mem
  72  #logical_decoding_work_mem = 64MB      # min 64kB
  73  #max_stack_depth = 2MB                 # min 100kB
  74 -#shared_memory_type = mmap             # the default is the first option
  75 +#shared_memory_type = sysv             # the default is the first option
  76                                         # supported by the operating system:
  77 -                                       #   mmap
  78                                         #   sysv
  79 +                                       #   mmap
  80                                         #   windows
  81                                         # (change requires restart)
  82 -#dynamic_shared_memory_type = posix    # the default is usually the first option
  83 +#dynamic_shared_memory_type = sysv     # the default is usually the first option
  84                                         # supported by the operating system:
  85 -                                       #   posix
  86                                         #   sysv
  87 +                                       #   posix
  88                                         #   windows
  89                                         #   mmap
  90                                         # (change requires restart)