linux-kernel - Re: [PATCH 2/2] cputime: remove duplicate code in account_process

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Date:   Thu, 11 Jul 2019 14:41:24 +0800
From:   Alex Shi <alex.shi@...ux.alibaba.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Frederic Weisbecker <fweisbec@...il.com>,
        Wanpeng Li <wanpeng.li@...mail.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cputime: remove duplicate code in
 account_process_tick

在 2019/7/10 下午10:15, Peter Zijlstra 写道:
> On Tue, Jul 09, 2019 at 02:01:00PM +0800, Alex Shi wrote:
>> In funcation account_process_tick, func actually do same things with
>> irqtime_account_process_tick, whenever if IRQ_TIME_ACCOUNTING set or
>> if sched_clock_irqtime enabled.
>>
>> So it's better to reuse one function for both.
> 
> But it's not the exact same.. and you didn't say, not did you say why
> that is fine.
> 

Thanks for reply!

The irqtime_account_process_tick path was introduced for precise ns irq time account(abb74cefa9c682fb sched: Export ns irqtimes through /proc/stat) while account_process_tick still use jiffes. but now both pathes are using ns cputime. And there is not strong reason to keep 2 very very similar path coexists. That's the reason I believe unite the collection is better. 

Thanks
Alex