From: Jeff Dike <jdike@addtoit.com>
To: Young Koh <young.koh@gmail.com>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] high-performance system calls using vsyscall
Date: Thu, 12 Jan 2006 18:38:48 -0500 [thread overview]
Message-ID: <20060112233848.GA945@ccure.user-mode-linux.org> (raw)
In-Reply-To: <3524bf1f0601120902v3812029l4d8ba5411b53f36f@mail.gmail.com>
On Thu, Jan 12, 2006 at 12:02:16PM -0500, Young Koh wrote:
> I found an old post discussing the possibility of turning a system
> call into a procedure call using vsyscall. Is it really implemented in
> recent versions? I tested with recent Linux/UML kernels and glibcs but
> system calls don't seem that fast. so, i guess it's not implemented
> yet?
In the generic kernel (or in whatever arches have the vsyscall page),
it's used for only a small number of system calls.
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. I think you would
have to fiddle libc to make all of the system calls fo this.
Jeff
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next prev parent reply other threads:[~2006-01-12 22:46 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 [this message]
2006-01-17 0:04 ` Blaisorblade
2006-01-17 1:59 ` Chris Lightfoot
2006-01-17 3:30 ` Jeff Dike
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