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Subject: Re: [PATCH v3] sched/cputime: add steal time support to full
 dynticks CPU time accounting
From: Rik van Riel <riel@redhat.com>
To: Wanpeng Li <kernellwp@gmail.com>, linux-kernel@vger.kernel.org,
        kvm@vger.kernel.org
Cc: Wanpeng Li <wanpeng.li@hotmail.com>, Ingo Molnar <mingo@kernel.org>,
        "Peter Zijlstra (Intel)" <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Paolo Bonzini <pbonzini@redhat.com>, Radim <rkrcmar@redhat.com>
Date: Tue, 24 May 2016 15:22:48 -0400
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On Wed, 2016-05-18 at 20:27 +0800, Wanpeng Li wrote:
> From: Wanpeng Li <wanpeng.li@hotmail.com>
>=20
> This patch adds steal guest time support to full dynticks CPU=C2=A0
> time accounting. After 'commit ff9a9b4c4334 ("sched, time: Switch=C2=A0
> VIRT_CPU_ACCOUNTING_GEN to jiffy granularity")', time is jiffy=C2=A0
> based sampling even if it's still listened to ring boundaries, so=C2=A0
> steal_account_process_tick() is reused to account how much 'ticks'=C2=A0
> are steal time after the last accumulation.=C2=A0
>=20
> Suggested-by: Rik van Riel <riel@redhat.com>
> Cc: Ingo Molnar <mingo@kernel.org>
> Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
> Cc: Rik van Riel <riel@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Frederic Weisbecker <fweisbec@gmail.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Radim <rkrcmar@redhat.com>
> Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>

This also nicely fixes up=C2=A0f9c904b7613b ("sched/cputime:=C2=A0
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@redhat.com>

--=20
All rights reversed

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