linux-kernel - Re: [PATCH v3] sched/cputime: add steal time support to full dynticks CPU time accounting

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Message-ID: <CANRm+Cx2GD+nfQqAUpZ7gcOuXaqabKQvCTFs=ZTgjgTpzsBkDQ@mail.gmail.com>
Date:	Wed, 25 May 2016 10:16:32 +0800
From:	Wanpeng Li <kernellwp@...il.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	kvm <kvm@...r.kernel.org>, Wanpeng Li <wanpeng.li@...mail.com>,
	Ingo Molnar <mingo@...nel.org>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Paolo Bonzini <pbonzini@...hat.com>, Radim <rkrcmar@...hat.com>
Subject: Re: [PATCH v3] sched/cputime: add steal time support to full dynticks
 CPU time accounting

Ping Paolo or Peterz.
2016-05-25 3:22 GMT+08:00 Rik van Riel <riel@...hat.com>:
> On Wed, 2016-05-18 at 20:27 +0800, Wanpeng Li wrote:
>> From: Wanpeng Li <wanpeng.li@...mail.com>
>>
>> This patch adds steal guest time support to full dynticks CPU
>> time accounting. After 'commit ff9a9b4c4334 ("sched, time: Switch
>> VIRT_CPU_ACCOUNTING_GEN to jiffy granularity")', time is jiffy
>> based sampling even if it's still listened to ring boundaries, so
>> steal_account_process_tick() is reused to account how much 'ticks'
>> are steal time after the last accumulation.
>>
>> Suggested-by: Rik van Riel <riel@...hat.com>
>> Cc: Ingo Molnar <mingo@...nel.org>
>> Cc: Peter Zijlstra (Intel) <peterz@...radead.org>
>> Cc: Rik van Riel <riel@...hat.com>
>> Cc: Thomas Gleixner <tglx@...utronix.de>
>> Cc: Frederic Weisbecker <fweisbec@...il.com>
>> Cc: Paolo Bonzini <pbonzini@...hat.com>
>> Cc: Radim <rkrcmar@...hat.com>
>> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
>
> This also nicely fixes up f9c904b7613b ("sched/cputime:
> Fix steal_account_process_tick() to always return jiffies"),
> which relies on a bool function returning a certain number
> of jiffies :)
>
> Reviewed-by: Rik van Riel <riel@...hat.com>
>
> --
> All rights reversed



-- 
Regards,
Wanpeng Li