db5.3/trunk/db-5.3.28-mmap-high-cpu-usage.patch

   1 Author: Filip Januš <fjanus@redhat.com>
   2 Date: 6 Sep 2021
   3 Related: https://bugzilla.redhat.com/show_bug.cgi?id=1992402
   4 Patch was created based on the discussion in the previous link
   5 diff -ur db-5.3.28/src/os/os_map.c db_patch/src/os/os_map.c
   6 --- db-5.3.28/src/os/os_map.c   2013-09-09 17:35:09.000000000 +0200
   7 +++ db_patch/src/os/os_map.c    2021-09-09 07:33:12.027328265 +0200
   8 @@ -213,7 +213,10 @@
   9         if (rp->max < rp->size)
  10                 rp->max = rp->size;
  11         if (ret == 0 && F_ISSET(infop, REGION_CREATE)) {
  12 -               if (F_ISSET(dbenv, DB_ENV_REGION_INIT))
  13 +
  14 +               rp->size = rp->max;
  15 +
  16 +        if (F_ISSET(dbenv, DB_ENV_REGION_INIT))
  17                         ret = __db_file_write(env, infop->fhp,
  18                             rp->size / MEGABYTE, rp->size % MEGABYTE, 0x00);
  19                 else