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examples/vm_power: allow managing idle cores

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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.sexton@intel.com>
Reviewed-by: David Hunt <david.hunt@intel.com>
Acked-by: Reshma Pattan <reshma.pattan@intel.com>
This commit is contained in:
Rory Sexton 2020-07-14 17:01:59 +01:00 committed by Thomas Monjalon
parent 95f648ff9e
commit 3cb46d40d3
2 changed files with 6 additions and 4 deletions
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2
doc/guides/sample_app_ug/vm_power_management.rst
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@ -423,6 +423,8 @@ described below:
0.01 but will need adjustment for different workloads
This parameter can be used multiple times for different sets of cores.
The branch ratio mechanism can also be useful for non-PMD cores and
hyper-threaded environments where C-States are disabled.
Compiling and Running the Guest Applications

8
examples/vm_power_manager/oob_monitor_x86.c
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@ -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