tests/vm/kern_max_task_pmem.c

   1 #include <darwintest.h>
   2 #include <sys/sysctl.h>
   3 #include <sys/errno.h>
   4
   5 #define MAX_TASK_PMEM "kern.max_task_pmem"
   6 #define HW_MEMSIZE_STR "hw.memsize"
   7 #define HW_MEMSIZE_THRESHOLD 600 * 1024 * 1024
   8
   9 T_GLOBAL_META(T_META_NAMESPACE("xnu.vm"));
  10
  11 /*
  12  * Embedded Device having physical memory greater than 600MB should have positive
  13  * value for kern.max_task_pmem if present.
  14  * Strategy:
  15  *  Fetch hw.memsize for the device.
  16  *  If hw.memsize > 600MB, and kern.max_task_pmem is present, assert that
  17  *  kern.max_task_pmem is set to value > 0.
  18  */
  19 T_DECL(kern_max_task_pmem, "Embedded platforms should have a positive value for kern.max_task_pmem when hw.memsize > 600MB")
  20 {
  21         int kern_max_task_pmem = 0;
  22         size_t pmem_size = sizeof(kern_max_task_pmem);
  23
  24         uint64_t hw_memsize = 0;
  25         size_t size_hw_memsize = sizeof(hw_memsize);
  26
  27         int ret = 0;
  28
  29         ret = sysctlbyname(HW_MEMSIZE_STR, &hw_memsize, &size_hw_memsize, NULL, 0);
  30         T_ASSERT_POSIX_SUCCESS(ret, "call sysctlbyname to get hardware mem size.");
  31
  32         T_LOG("Checking if %s > %d", HW_MEMSIZE_STR, HW_MEMSIZE_THRESHOLD);
  33         if (hw_memsize <= HW_MEMSIZE_THRESHOLD) {
  34                 T_SKIP("Device has hw.memsize = %lld. Skipping the check for %s", hw_memsize, MAX_TASK_PMEM);
  35         }
  36
  37         T_LOG("Device has %s = %lld", HW_MEMSIZE_STR, hw_memsize);
  38         T_LOG("Testing for %s ...", MAX_TASK_PMEM);
  39
  40         ret = sysctlbyname(MAX_TASK_PMEM, &kern_max_task_pmem, &pmem_size, NULL, 0);
  41         T_ASSERT_POSIX_SUCCESS(ret, "call sysctlbyname to get max task physical memory");
  42
  43         T_LOG("%s = %d", MAX_TASK_PMEM, kern_max_task_pmem);
  44         T_ASSERT_GT_INT(kern_max_task_pmem, 0, "%s should be greater than 0", MAX_TASK_PMEM);
  45 }