Message-ID: <48B823F6.1010509@novell.com>
Date: Fri, 29 Aug 2008 12:29:42 -0400
From: Gregory Haskins <ghaskins@novell.com>
User-Agent: Thunderbird 2.0.0.16 (X11/20080720)
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To: Andi Kleen <andi@firstfloor.org>
CC: Gregory Haskins <gregory.haskins@gmail.com>, mingo@elte.hu,
       rostedt@goodmis.org, tglx@linutronix.de, linux-kernel@vger.kernel.org,
       linux-rt-users@vger.kernel.org
Subject: Re: [PATCH] seqlock: serialize against writers
References: <20080829154237.1196.66825.stgit@dev.haskins.net> <87abevpzv7.fsf@basil.nowhere.org> <48B81F60.3080409@gmail.com> <20080829162216.GW26610@one.firstfloor.org>
In-Reply-To: <20080829162216.GW26610@one.firstfloor.org>
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Andi Kleen wrote:
>> Im running it on a x86_64 box as we speak.  How can I tell if there is=
 a
>> certain mode that is permitting this?
>>    =20
>
> If the boot up says you're running with PMtimer then it uses the fallba=
ck
> (usually happens on pre Fam10h AMD boxes). A typical Intel box
> would use the faster ring 3 only TSC path and then explode with your
> change I bet.=20
>  =20

Thinking about this some more, perhaps the issue is I am not hitting the
contended path in vsyscall?

-Greg


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