sched/numa: Do not swap tasks between nodes when spare capacity is available

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If a destination node has spare capacity but there is an imbalance then
two tasks are selected for swapping. If the tasks have no numa group
or are within the same NUMA group, it's simply shuffling tasks around
without having any impact on the compute imbalance. Instead, it's just
punishing one task to help another.

Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: K Prateek Nayak <kprateek.nayak@amd.com>
Link: https://lore.kernel.org/r/20220520103519.1863-3-mgorman@techsingularity.net

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Mel Gorman 2022-05-20 11:35:17 +01:00 • committed by Peter Zijlstra

parent 70ce3ea9aa

commit 13ede33150

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kernel/sched/fair.c

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