From mboxrd@z Thu Jan  1 00:00:00 1970
From: Fernando Luis Vazquez Cao <fernando_b1@lab.ntt.co.jp>
Subject: Re: Monotonic clock with KVM pv-clock
Date: Mon, 20 Jan 2014 23:59:39 +0900
Message-ID: <52DD39DB.3040109@lab.ntt.co.jp>
References: <20140120095656.GA1282@fermat.math.technion.ac.il> <20140120133317.GA7509@amt.cnet>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Cc: kvm@vger.kernel.org
To: Marcelo Tosatti <mtosatti@redhat.com>,
	"Nadav Har'El" <nyh@math.technion.ac.il>
Return-path: <kvm-owner@vger.kernel.org>
Received: from tama50.ecl.ntt.co.jp ([129.60.39.147]:50214 "EHLO
	tama50.ecl.ntt.co.jp" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1751669AbaATO74 (ORCPT <rfc822;kvm@vger.kernel.org>);
	Mon, 20 Jan 2014 09:59:56 -0500
In-Reply-To: <20140120133317.GA7509@amt.cnet>
Sender: kvm-owner@vger.kernel.org
List-ID: <kvm.vger.kernel.org>

(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.