linux-kernel - Re: [PATCH -next] sched: Dec __cfs_bandwith_used in destroy_cfs

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Message-ID: <821cf5ad-4633-0005-63b3-14618891aeed@huawei.com>
Date:   Thu, 15 Jul 2021 10:07:25 +0800
From:   Zhang Qiao <zhangqiao22@...wei.com>
To:     Daniel Jordan <daniel.m.jordan@...cle.com>
CC:     <mingo@...hat.com>, <peterz@...radead.org>,
        <juri.lelli@...hat.com>, <vincent.guittot@...aro.org>,
        <dietmar.eggemann@....com>, <rostedt@...dmis.org>,
        <bsegall@...gle.com>, <mgorman@...e.de>, <bristot@...hat.com>,
        <pjt@...gle.com>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH -next] sched: Dec __cfs_bandwith_used in
 destroy_cfs_bandwidth()



On 2021/7/14 21:22, Daniel Jordan wrote:
> On Wed, Jul 14, 2021 at 07:20:39PM +0800, Zhang Qiao wrote:
>> And i have another thought is that we can hold the
>> hotplug lock before calling cfs_bandwidth_usage_dec().
>> This way, fewer modifications are involved.
>> What do you think about it?
> 
> It is fewer lines, but then hotplug lock is taken pointlessly for
> !JUMP_LABEL.  Not a huge deal in a slow path like this, just a bit lame.
> Adding a new variant seems cleaner if more verbose.
make sense. And I will modify in next version.
thanks.
> .
>