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Message-ID: <CAGsJ_4z30yfw=kyBNZuSLMaCcMBmstD=bK4VOsVW3vKO3kO+fA@mail.gmail.com>
Date: Fri, 3 Dec 2021 21:38:33 +1300
From: Barry Song <21cnbao@...il.com>
To: Mel Gorman <mgorman@...hsingularity.net>
Cc: Peter Zijlstra <peterz@...radead.org>,
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>
Subject: Re: [PATCH 1/2] sched/fair: Use weight of SD_NUMA domain in find_busiest_group
On Fri, Dec 3, 2021 at 8:27 PM Mel Gorman <mgorman@...hsingularity.net> wrote:
>
> 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")
Hi Mel,
sorry I might be missing something. but I have failed to figure out
where this commit is.
> 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
>
Thanks
Barry
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