From: "Jan Beulich" <jbeulich@novell.com>
To: Samuel Thibault <samuel.thibault@eu.citrix.com>
Cc: xen-devel@lists.xensource.com
Subject: Re: Linux questions
Date: Mon, 03 Dec 2007 11:40:28 +0000 [thread overview]
Message-ID: <4753F93C.76E4.0078.0@novell.com> (raw)
In-Reply-To: <20071203112958.GB4930@implementation.labri.fr>
>>> Samuel Thibault <samuel.thibault@eu.citrix.com> 03.12.07 12:29 >>>
>Jan Beulich, le Mon 03 Dec 2007 11:24:35 +0000, a écrit :
>> 2) What is the reason for the inconsistent use of rmb() vs. barrier() in
>> time-xen.c? It would seem to me that rmb() should be sufficient in all
>> cases.
>
>rmb() is more powerful than barrier(), not the converse.
Oh, sorry, I mixed barrier() with mb(). So the proposal would then simply
be the other way around (the use of locked operations or fence instructions
on x86 is really unnecessary as long as WC memory or non-temporal stores
don't need to be taken into consideration).
Jan
next prev parent reply other threads:[~2007-12-03 11:40 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 [this message]
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
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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