This change is required to allow the branch ratio algorithm to power manage cores with no workload running on them. This is useful both when idle cores don't use C-states and for a number of hyperthreading scenarios.
Signed-off-by: Rory Sexton <rory.sex...@intel.com> Reviewed-by: David Hunt <david.h...@intel.com> --- examples/vm_power_manager/oob_monitor_x86.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/examples/vm_power_manager/oob_monitor_x86.c b/examples/vm_power_manager/oob_monitor_x86.c index 3c514475f..a5b1c168c 100644 --- a/examples/vm_power_manager/oob_monitor_x86.c +++ b/examples/vm_power_manager/oob_monitor_x86.c @@ -96,12 +96,12 @@ apply_policy(int core) g_branch_misses = miss_diff; if (hits_diff < (INTERVAL*100)) { - /* Likely no workload running on this core. Skip. */ - return -1.0; + /* Likely no workload running on this core. */ + ratio = 0.0; + } else { + ratio = (float)miss_diff * (float)100 / (float)hits_diff; } - ratio = (float)miss_diff * (float)100 / (float)hits_diff; - /* * Store the last few directions that the ratio indicates * we should take. If there's on 'up', then we scale up -- 2.25.1