linux-kernel - [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest

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Message-Id: <20211201151844.20488-2-mgorman@techsingularity.net>
Date:   Wed,  1 Dec 2021 15:18:43 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Aubrey Li <aubrey.li@...ux.intel.com>,
        Barry Song <song.bao.hua@...ilicon.com>,
        Mike Galbraith <efault@....de>,
        Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group

find_busiest_group uses the child domain's group weight instead of
the sched_domain's weight that has SD_NUMA set when calculating the
allowed imbalance between NUMA nodes. This is wrong and inconsistent
with find_idlest_group.

This patch uses the SD_NUMA weight in both.

Fixes: c4e8f691d926 ("sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans multiple LLCS")
Signed-off-by: Mel Gorman <mgorman@...hsingularity.net>
---
 kernel/sched/fair.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 6e476f6d9435..0a969affca76 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -9397,7 +9397,7 @@ static inline void calculate_imbalance(struct lb_env *env, struct sd_lb_stats *s
 		/* Consider allowing a small imbalance between NUMA groups */
 		if (env->sd->flags & SD_NUMA) {
 			env->imbalance = adjust_numa_imbalance(env->imbalance,
-				busiest->sum_nr_running, busiest->group_weight);
+				busiest->sum_nr_running, env->sd->span_weight);
 		}
 
 		return;
-- 
2.31.1