linux-kernel - Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support

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Message-ID: <20070213165642.GB16394@elte.hu>
Date:	Tue, 13 Feb 2007 17:56:42 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Benjamin LaHaise <bcrl@...ck.org>
Cc:	Alan <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	Evgeniy Polyakov <johnpol@....mipt.ru>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/11] ANNOUNCE: "Syslets", generic asynchronous system call support


* Benjamin LaHaise <bcrl@...ck.org> wrote:

> > > Open issues:
> > 
> > Let me add some more
> 
> Also: FPU state (especially important with the FPU and SSE memory copy 
> variants), segment register bases on x86-64, interaction with 
> set_fs()...

agreed - i'll fix this. But i can see no big conceptual issue here - 
these resources are all attached to the user context, and that doesnt 
change upon an 'async context-switch'. So it's "only" a matter of 
properly separating the user execution context from the kernel execution 
context. The hardest bit was getting the ptregs details right - the 
FPU/SSE state is pretty much async already (in the hardware too) and 
isnt even touched by any of these codepaths.

	Ingo
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