linux-kernel - Re: [RFC] x86: xsave/xrstor support, ucontext

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Message-ID: <48351E49.8000707@zytor.com>
Date:	Thu, 22 May 2008 00:18:33 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Roland McGrath <roland@...hat.com>
CC:	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mikael Pettersson <mikpe@...uu.se>,
	Andi Kleen <andi@...stfloor.org>, mingo@...e.hu,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, drepper@...hat.com,
	Hongjiu.lu@...el.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, rmk+lkml@....linux.org.uk, dan@...ian.org,
	asit.k.mallick@...el.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

Roland McGrath wrote:
>> Yes, but I suspect for legacy apps running without vDSO might matter.
> 
> "Legacy" apps want to be changed to make a new kind of kernel query
> and care about new details of signal frame layout for new features
> they never used before, but don't want to handle the vDSO?

I'm talking mostly about semi-embedded ISVs that have managed to get 
themselves funny ideas about what they don't want to change.  The vDSO 
definitely involves more machinery to get to.

	-hpa
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