From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: user-mode-linux-devel@lists.sourceforge.net,
Young Koh <young.koh@gmail.com>
Subject: Re: [uml-devel] high-performance system calls using vsyscall
Date: Mon, 16 Jan 2006 22:30:55 -0500 [thread overview]
Message-ID: <20060117033055.GA17171@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200601170104.22814.blaisorblade@yahoo.it>
On Tue, Jan 17, 2006 at 01:04:21AM +0100, Blaisorblade wrote:
> No, wrong - on x86 it's used for everything, depending on userspace (it's
> replacing int 0x80 with sysenter). For some reason, on x86-64 it was that
> way, but it switched to what you say (implementing only a few syscalls
> directly in userspace).
Yeah, I was remembering Andrea's original proposal to implement a few system
calls entirely in userspace.
> > In a tt-style UML, where the UML kernel is in the same address space
> > as the process, this could be used for all system calls, where you
> > would just jump from there into the UML kernel.
>
> 1st, TT mode is kept there only until SKAS0 will be damn stable (it seems
> we're probably reaching that, no foreseen problems, except maybe my new TLS
> code doesn't work for SKAS0 yet IMHO), and because it's the only SMP
> supporting mode.
It has worked fine for me since I fixed that one bug.
Jeff
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prev parent reply other threads:[~2006-01-17 2:39 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-12 17:02 [uml-devel] high-performance system calls using vsyscall Young Koh
2006-01-12 23:38 ` Jeff Dike
2006-01-17 0:04 ` Blaisorblade
2006-01-17 1:59 ` Chris Lightfoot
2006-01-17 3:30 ` Jeff Dike [this message]
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