linux-kernel - Re: [PATCH 2/6] Add a global synchronization point for pvclock

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Message-ID: <4BD72643.7050200@goop.org>
Date:	Tue, 27 Apr 2010 11:00:35 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Glauber Costa <glommer@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, avi@...hat.com,
	Zachary Amsden <zamsden@...hat.com>
Subject: Re: [PATCH 2/6] Add a global synchronization point for pvclock

On 04/27/2010 06:28 AM, Marcelo Tosatti wrote:
>> +	last = atomic64_read(&last_value);
>> +	do {
>> +		if (ret < last)
>> +			return last;
>> +		last = atomic64_cmpxchg(&last_value, last, ret);
>> +	} while (unlikely(last != ret));
>>     
> Wraparound?
>   

If the units nanoseconds, it's good for ~500,000 years of uptime.

    J

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