From: Andi Kleen <andi@firstfloor.org>
To: Keir Fraser <Keir.Fraser@cl.cam.ac.uk>
Cc: xen-devel@lists.xensource.com, Jan Beulich <jbeulich@novell.com>,
Samuel Thibault <samuel.thibault@eu.citrix.com>
Subject: Re: Linux questions
Date: Tue, 04 Dec 2007 12:13:41 +0100 [thread overview]
Message-ID: <p73r6i2k90a.fsf@bingen.suse.de> (raw)
In-Reply-To: <C37AE293.195B6%Keir.Fraser@cl.cam.ac.uk> (Keir Fraser's message of "Tue\, 04 Dec 2007 10\:55\:15 +0000")
Keir Fraser <Keir.Fraser@cl.cam.ac.uk> writes:
> On 4/12/07 10:23, "Jan Beulich" <jbeulich@novell.com> wrote:
>
>> I have to disagree: At least the uses of barrier() in monotonic_clock() appear
>> to be in places where in reality (and from a theoretical standpoint) rmb()
>> ought to be used.
>
> We're sync'ing against concurrent updates of a this_cpu variable. We can
> only race updates in a local ISR, and hence barrier() suffices.
Not if you use RDTSC inside the loop.
-Andi
next prev parent reply other threads:[~2007-12-04 11:13 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-03 11:24 Linux questions Jan Beulich
2007-12-03 11:29 ` Samuel Thibault
2007-12-03 11:40 ` Jan Beulich
2007-12-03 18:32 ` Keir Fraser
2007-12-04 10:23 ` Jan Beulich
2007-12-04 10:55 ` Keir Fraser
2007-12-04 11:13 ` Andi Kleen [this message]
2007-12-04 11:27 ` Keir Fraser
2007-12-04 11:44 ` Andi Kleen
2007-12-04 11:56 ` Keir Fraser
2007-12-04 12:23 ` Andi Kleen
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