linux-kernel - Re: [PATCH] sched/pelt: simplify load_sum assignment code in attach_entity_load

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Message-ID: <F1E08DFA-40E8-447E-B37A-DEE651E87F80@getmailspring.com>
Date:   Fri, 15 Jul 2022 22:33:30 +0800
From:   Zackary Liu <zackary.liu.pro@...il.com>
To:     Vincent Guittot <vincent.guittot@...aro.org>
Cc:     "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "juri.lelli@...hat.com" <juri.lelli@...hat.com>,
        "dietmar.eggemann@....com" <dietmar.eggemann@....com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "bsegall@...gle.com" <bsegall@...gle.com>,
        "mgorman@...e.de" <mgorman@...e.de>,
        "bristot@...hat.com" <bristot@...hat.com>,
        "vschneid@...hat.com" <vschneid@...hat.com>,
        "kuyo.chang@...iatek.com" <kuyo.chang@...iatek.com>,
        "linux-kernel@...r.kernel.org" 
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] sched/pelt: simplify load_sum assignment code in
 attach_entity_load_avg()



On Jun 22 2022, at 11:49 pm, Zackary Liu <zackary.liu.pro@...il.com> wrote:

> On Jun 22 2022, at 11:20 pm, Vincent Guittot
> <vincent.guittot@...aro.org> wrote:
> 
>> On Tue, 21 Jun 2022 at 17:45, Zhaoyu Liu <zackary.liu.pro@...il.com> wrote:
>>> 
>>> In commit 40f5aa4c5eae ("sched/pelt: Fix attach_entity_load_avg()
>>> corner case"),
>>> these code was committed:
>>>         if (se_weight(se) < se->avg.load_sum)
>>>                 se->avg.load_sum = div_u64(se->avg.load_sum, se_weight(se));
>>>         else
>>>                 se->avg.load_sum = 1;
>>> 
>>> they could be replace with:
>>>         se->avg.load_sum = div_u64(se->avg.load_sum, se_weight(se))
>>> ?: 1;
>>> 
>>> to make the code cleaner.
>> 
>> This quite subjective as I consider current version cleaner than your proposal
> 
> Thanks for your reply, vincent
> 
> Perhaps, this code is more concise, and this form can exist in many
> places in the kernel, and can be searched with 'grep "?: 1;" -nR kernel'
> 
> --
> zackary

I have sent a patch couple days ago but still i don't get the reply,
I am looking forward to your reply,
thank you

--
zackary