linux-kernel - Re: [PATCH] seqlock: serialize against writers

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Message-ID: <48B823F6.1010509@novell.com>
Date:	Fri, 29 Aug 2008 12:29:42 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	Gregory Haskins <gregory.haskins@...il.com>, mingo@...e.hu,
	rostedt@...dmis.org, tglx@...utronix.de,
	linux-kernel@...r.kernel.org, linux-rt-users@...r.kernel.org
Subject: Re: [PATCH] seqlock: serialize against writers

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?
>>     
>
> If the boot up says you're running with PMtimer then it uses the fallback
> (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. 
>   

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

-Greg



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