From: Mel Gorman <mgorman@techsingularity.net>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@kernel.org>,
Vincent Guittot <vincent.guittot@linaro.org>,
Valentin Schneider <valentin.schneider@arm.com>,
Aubrey Li <aubrey.li@linux.intel.com>,
Barry Song <song.bao.hua@hisilicon.com>,
Mike Galbraith <efault@gmx.de>,
Srikar Dronamraju <srikar@linux.vnet.ibm.com>,
LKML <linux-kernel@vger.kernel.org>,
Mel Gorman <mgorman@techsingularity.net>
Subject: [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group
Date: Thu, 25 Nov 2021 15:19:40 +0000 [thread overview]
Message-ID: <20211125151941.8710-2-mgorman@techsingularity.net> (raw)
In-Reply-To: <20211125151941.8710-1-mgorman@techsingularity.net>
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@techsingularity.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
next prev parent reply other threads:[~2021-11-25 15:22 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-25 15:19 [PATCH 0/2] Adjust NUMA imbalance for multiple LLCs Mel Gorman
2021-11-25 15:19 ` Mel Gorman [this message]
2021-11-25 15:19 ` [PATCH 2/2] sched/fair: Adjust the allowed NUMA imbalance when SD_NUMA spans " Mel Gorman
2021-11-28 15:06 ` [sched/fair] b4d95a034c: phoronix-test-suite.tiobench.RandomWrite.64MB.8.mb_s -26.3% regression kernel test robot
2021-11-29 11:35 ` Mel Gorman
2021-12-01 15:18 [PATCH v3 0/2] Adjust NUMA imbalance for multiple LLCs Mel Gorman
2021-12-01 15:18 ` [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group Mel Gorman
2021-12-03 8:38 ` Barry Song
2021-12-03 9:51 ` Gautham R. Shenoy
2021-12-03 10:53 ` Mel Gorman
2021-12-10 9:33 [PATCH v4 0/2] Adjust NUMA imbalance for multiple LLCs Mel Gorman
2021-12-10 9:33 ` [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group Mel Gorman
2021-12-21 10:53 ` Vincent Guittot
2021-12-21 11:32 ` Mel Gorman
2021-12-21 13:05 ` Vincent Guittot
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