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In the current prefer sibling load balancing code, there is an implicit
assumption that the busiest sched group and local sched group are
equivalent, hence the tasks to be moved is simply the difference in
number of tasks between the two groups (i.e. imbalance) divided by two.
However, we may have different number of cores between the cluster groups,
say when we take CPU offline or we have hybrid groups. In that case,
we should balance between the two groups such that #tasks/#cores ratio
is the same between the same between both groups. Hence the imbalance
computed will need to reflect this.
Adjust the sibling imbalance computation to take into account of the
above considerations.
Signed-off-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/4eacbaa236e680687dae2958378a6173654113df.1688770494.git.tim.c.chen@linux.intel.com
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