linux-kernel - Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

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Message-ID: <20070301091527.GH7217@2ka.mipt.ru>
Date:	Thu, 1 Mar 2007 12:15:28 +0300
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	Andrea Arcangeli <andrea@...e.de>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Davide Libenzi <davidel@...ilserver.org>,
	Ulrich Drepper <drepper@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3

On Thu, Mar 01, 2007 at 02:33:01AM +0100, Andrea Arcangeli (andrea@...e.de) wrote:
> On Thu, Mar 01, 2007 at 12:12:28AM +0100, Ingo Molnar wrote:
> > more capable by providing more special system calls like sys_upcall() to 
> > execute a user-space function. (that way a syslet could still execute 
> > user-space code without having to exit out of kernel mode too 
> > frequently) Or perhaps a sys_x86_bytecode() call, that would execute a 
> > pre-verified, kernel-stored sequence of simplified x86 bytecode, using 
> > the kernel stack.
> 
> Which means the userspace code would then run with kernel privilege
> level somehow (after security verifier, whatever). You remember I
> think it's a plain crazy idea...

Syslets/threadlets do not execute userspace code in kernel - they behave
similar to threads. sys_upcall() would be a wrapper for quite complex
threadlet machinery.

-- 
	Evgeniy Polyakov
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