sched: Set group_imb only a task can be pulled from the busiest cpu

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When cycling through sched groups to determine the busiest group, set
group_imb only if the busiest cpu has more than 1 runnable task. This patch
fixes the case where two cpus in a group have one runnable task each, but there
is a large weight differential between these two tasks. The load balancer is
unable to migrate any task from this group, and hence do not consider this
group to be imbalanced.

Signed-off-by: Nikhil Rao <ncrao@google.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1286996978-7007-3-git-send-email-ncrao@google.com>
[ small code readability edits ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

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Nikhil Rao 2010-10-13 12:09:36 -07:00 • committed by Ingo Molnar

parent ef8002f684

commit 2582f0eba5

1 changed files with 7 additions and 5 deletions

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kernel/sched_fair.c

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