sched: Avoid unnecessary calculation of load imbalance at clone time

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In find_idlest_group(), the load imbalance is only relevant when the group
is either overloaded or fully busy but it is calculated unconditionally.
This patch moves the imbalance calculation to the context it is required.
Technically, it is a micro-optimisation but really the benefit is avoiding
confusing one type of imbalance with another depending on the group_type
in the next patch.

No functional change.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Vincent Guittot <vincent.guittot@linaro.org>
Link: https://lkml.kernel.org/r/20201120090630.3286-3-mgorman@techsingularity.net

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Mel Gorman 2020-11-20 09:06:28 +00:00 • committed by Peter Zijlstra

parent abeae76a47

commit 5c339005f8

1 changed files with 5 additions and 3 deletions

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kernel/sched/fair.c

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