linux-kernel - Re: [PATCH] sched/fair: Fix wrong flag passed to set_rd

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Date: Wed, 10 Apr 2024 11:41:29 +0530
From: Shrikanth Hegde <sshegde@...ux.ibm.com>
To: Hongyan Xia <hongyan.xia2@....com>
Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Juri Lelli <juri.lelli@...hat.com>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Steven Rostedt <rostedt@...dmis.org>, Ben Segall <bsegall@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        Daniel Bristot de Oliveira
 <bristot@...hat.com>,
        Valentin Schneider <vschneid@...hat.com>
Subject: Re: [PATCH] sched/fair: Fix wrong flag passed to
 set_rd_overutilized()



On 4/10/24 1:43 AM, Hongyan Xia wrote:
> In update_sd_lb_stats(), sg_overloaded is passed to
> set_rd_overutilized(). This seems to be a typo during refactoring, which
> breaks many of my local EAS tests because overutilization is mistakenly
> triggered.
> 
> This fix makes those EAS tests work again.
> 

Yes. This is a needed fix. 

> Signed-off-by: Hongyan Xia <hongyan.xia2@....com>
 

FYI, Same patch has been posted by Vincent a week ago. 
https://lore.kernel.org/all/20240404155738.2866102-1-vincent.guittot@linaro.org/


> ---
> Hi Ingo,
> 
> Could you double check if this is the correct fix? Thank you.
> 
> ---
>  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 1dd37168da50..bb1ae4ed0d91 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -10661,7 +10661,7 @@ static inline void update_sd_lb_stats(struct lb_env *env, struct sd_lb_stats *sd
>  		set_rd_overloaded(env->dst_rq->rd, sg_overloaded);
>  
>  		/* Update over-utilization (tipping point, U >= 0) indicator */
> -		set_rd_overutilized(env->dst_rq->rd, sg_overloaded);
> +		set_rd_overutilized(env->dst_rq->rd, sg_overutilized);
>  	} else if (sg_overutilized) {
>  		set_rd_overutilized(env->dst_rq->rd, sg_overutilized);
>  	}