linux-kernel - [Question] load balance move tasks not suitable ?

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Message-ID: <6e782fa5-de1d-93a9-ed11-5b43b65b20c9@huawei.com>
Date:   Mon, 30 Jul 2018 20:08:55 +0800
From:   "weiqi (C)" <weiqi4@...wei.com>
To:     <linux-kernel@...r.kernel.org>, <peterz@...radead.org>
CC:     Zhanghailiang <zhang.zhanghailiang@...wei.com>
Subject: [Question] load balance move tasks not suitable ?

Hi Peter,

After  Commits 5d6523ebd(sched: Fix load-balance wreckage)，
The jugement whether imbalance reached changed from twice to one-half.

from

(1) if((load * 2)> rem_load_move)
         goto next;

to

(2) if((load / 2)> env-> load_move)
         goto next;

I'm confused about this change.

"load*2" may be more appropriate, because if a task whose load more than 
env->imbalance is moved from high load cpu to low load cpu,

will make more imbalance.

Regards,

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