linux-kernel - Re: x86: 4kstacks default

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Message-ID: <480BD665.20804@qumranet.com>
Date:	Mon, 21 Apr 2008 02:48:53 +0300
From:	Avi Kivity <avi@...ranet.com>
To:	Bernd Eckenfels <ecki@...a.inka.de>
CC:	linux-kernel@...r.kernel.org
Subject: Re: x86: 4kstacks default

Bernd Eckenfels wrote:
> A question along this line. Why is the Userspace Thread bound to a
> Kernel-Space Stack at all? I could imagine a solution like Stack Pools
> assigned only of a Thread enters kernel space, or something like this?
>
>   

The vast majority of threads are sleeping (with a stack footprint in the 
kernel).  If you have an N-way system, at most N threads can be in 
userspace at any given moment.

You could multiplex several userspace threads on one kernel thread (the 
M:N model), but it gets fairly complex.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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