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From: Fernando Luis Vazquez Cao <fernando_b1@lab.ntt.co.jp>
To: Marcelo Tosatti <mtosatti@redhat.com>,
	"Nadav Har'El" <nyh@math.technion.ac.il>
Cc: kvm@vger.kernel.org
Subject: Re: Monotonic clock with KVM pv-clock
Date: Mon, 20 Jan 2014 23:59:39 +0900	[thread overview]
Message-ID: <52DD39DB.3040109@lab.ntt.co.jp> (raw)
In-Reply-To: <20140120133317.GA7509@amt.cnet>

(2014/01/20 22:33), Marcelo Tosatti wrote:
> On Mon, Jan 20, 2014 at 11:56:56AM +0200, Nadav Har'El wrote:
>> If KVM_SYSTEM_TIME is not a correct way to get a monotonic paravirtual clock
>> from KVM, is there a correct way?
> Inside a Linux guest? Can use sched_clock().

I would like to mention that Linux guests usually do not use sched_clock()
directly. The reason being that the kvm_clock based sched_clock() is not
marked stable (sched_clock_stable is 0), which means that the pair of
wrappers sched_clock_local()/sched_clock_remote() is used instead.

  reply	other threads:[~2014-01-20 14:59 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-01-20  9:56 Monotonic clock with KVM pv-clock Nadav Har'El
2014-01-20 13:33 ` Marcelo Tosatti
2014-01-20 14:59   ` Fernando Luis Vazquez Cao [this message]
2014-01-21  0:19     ` Marcelo Tosatti
2014-01-21 14:23       ` Fernando Luis Vazquez Cao
2014-01-22 15:41         ` Marcelo Tosatti
2014-01-21 13:24   ` Nadav Har'El
2014-01-21 15:27     ` Marcelo Tosatti

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