linux-kernel - Re: [PATCH v3] sched/cputime: Resync steal time when guest & host lose sync

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Message-ID: <1471400125.32433.61.camel@redhat.com>
Date:	Tue, 16 Aug 2016 22:15:25 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Wanpeng Li <kernellwp@...il.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
Cc:	Wanpeng Li <wanpeng.li@...mail.com>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Paolo Bonzini <pbonzini@...hat.com>,
	Radim Krcmar <rkrcmar@...hat.com>,
	Mike Galbraith <efault@....de>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v3] sched/cputime: Resync steal time when guest & host
 lose sync

On Wed, 2016-08-17 at 10:05 +0800, Wanpeng Li wrote:

> This patch fix the regression by limiting the account_other_time()
> from 
> get_vtime_delta() to avoid underflow, and let other three call sites
> (account_other_time() and steal_account_process_time()) account
> however 
> much steal time the host told us elapsed. 
> 
> Suggested-by: Rik van Riel <riel@...hat.com> 
> Suggested-by: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Rik van Riel <riel@...hat.com>
> Cc: Paolo Bonzini <pbonzini@...hat.com>
> Cc: Radim Krcmar <rkrcmar@...hat.com>
> Cc: Mike Galbraith <efault@....de>
> Cc: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Signed-off-by: Wanpeng Li <wanpeng.li@...mail.com>
> 

Reviewed-by: Rik van Riel <riel@...hat.com>

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