Function enableLinuxPerformanceMode

app/src/Platform/AppPlatform.cpp:342–369

* @brief Linux analog of the Windows EcoQoS opt-out: raises the scheduler utilization clamp so * EAS places the main thread on a big core. Unprivileged (>= 5.3); failures ignored. */

 *        EAS places the main thread on a big core. Unprivileged (>= 5.3); failures ignored.
 */
static void enableLinuxPerformanceMode()
{
#  ifdef SYS_sched_setattr
  struct SchedAttr {
    uint32_t size;
    uint32_t sched_policy;
    uint64_t sched_flags;
    int32_t sched_nice;
    uint32_t sched_priority;
    uint64_t sched_runtime;
    uint64_t sched_deadline;
    uint64_t sched_period;
    uint32_t sched_util_min;
    uint32_t sched_util_max;
  };

  constexpr uint64_t kKeepPolicy   = 0x08;
  constexpr uint64_t kKeepParams   = 0x10;
  constexpr uint64_t kUtilClampMin = 0x20;

  SchedAttr attr      = {};
  attr.size           = sizeof(attr);
  attr.sched_flags    = kKeepPolicy | kKeepParams | kUtilClampMin;
  attr.sched_util_min = 1024;

  (void)syscall(SYS_sched_setattr, 0, &attr, 0);
#  endif
}

#endif