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rcu: fix a performance regression

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Commit "rcu: Create RCU-specific workqueues with rescuers" switched RCU
to using local workqueses and removed power efficiency flag from them.

This caused a performance regression that can be observed in Geekbench 5
after enabling CONFIG_WQ_POWER_EFFICIENT_DEFAULT: score went down from
760/2500 to 620/2300 (single/multi core respectively).

Add WQ_POWER_EFFICIENT flag to avoid this regression.

Signed-off-by: Yaroslav Furman <yaro330@gmail.com>
This commit is contained in:
Yaroslav Furman 2019-12-11 03:06:26 +03:00 committed by spakkkk
parent 65f213e308
commit 28228ed9c9
1 changed files with 1 additions and 1 deletions
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kernel/rcu/tree.c
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@ -4177,7 +4177,7 @@ void __init rcu_init(void)
}
/* Create workqueue for expedited GPs and for Tree SRCU. */
rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_MEM_RECLAIM, 0);
rcu_gp_wq = alloc_workqueue("rcu_gp", WQ_POWER_EFFICIENT | WQ_MEM_RECLAIM, 0);
WARN_ON(!rcu_gp_wq);
rcu_par_gp_wq = alloc_workqueue("rcu_par_gp", WQ_MEM_RECLAIM, 0);
WARN_ON(!rcu_par_gp_wq);