Message-ID: <45D241A2.6000401@vmware.com>
Date: Tue, 13 Feb 2007 14:54:26 -0800
From: Zachary Amsden <zach@vmware.com>
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To: Jeremy Fitzhardinge <jeremy@goop.org>
CC: Andi Kleen <ak@muc.de>, Andrew Morton <akpm@osdl.org>,
       linux-kernel@vger.kernel.org, virtualization@lists.osdl.org,
       xen-devel@lists.xensource.com, Chris Wright <chrisw@sous-sol.org>,
       Ian Pratt <ian.pratt@xensource.com>,
       Christian Limpach <Christian.Limpach@cl.cam.ac.uk>
Subject: Re: [patch 13/21] Xen-paravirt: Add nosegneg capability to the vsyscall
 page notes
References: <20070213221729.772002682@goop.org> <20070213221830.466651996@goop.org> <45D23F97.5040907@vmware.com> <45D24066.4070109@goop.org>
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Jeremy Fitzhardinge wrote:
> Zachary Amsden wrote:
>   
>> I don't like this because now a kernel compiled with both CONFIG_XEN
>> and CONFIG_VMI has "nosegneg" turned on.  We don't actually require
>> this for performance or correctness, so it would be nice to be able to
>> dynamically turn it off instead of having it forced. 
>>     
>
> Any suggestions about how to do this?  It seems hard to have a note
> dynamically appear and disappear in the vsyscall.so.
>
> I wasn't terribly concerned about this, since there is effectively zero
> performance difference between the two library implementations.
>   

I'm not super concerned either, but I still don't like it.  There 
already is dynamic replacement for vsyscall.so, so you could have just 
dropped in an an-note-ated version.

Zach
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