linux-kernel - [PATCH RFC 0/6] Implement per-processor data areas for i386.

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Message-ID: <200608300503_MC3-1-C9C4-92F7@compuserve.com>
Date:	Wed, 30 Aug 2006 05:00:33 -0400
From:	Chuck Ebbert <76306.1226@...puserve.com>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	Andrew Morton <akpm@...l.org>, Andi Kleen <ak@...e.de>,
	Jan Beulich <jbeulich@...ell.com>,
	Zachary Amsden <zach@...are.com>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH RFC 0/6] Implement per-processor data areas for i386.

In-Reply-To: <20060827084417.918992193@...p.org>

On Sun, 27 Aug 2006 01:44:17 -0700, Jeremy Fitzhardinge wrote:

> This patch implements per-processor data areas by using %gs as the
> base segment of the per-processor memory.

This changes the ABI for signals and ptrace() and that seems like
a bad idea to me.

And the way things are done now is so ingrained into the i386
kernel that I'm not sure it can be done.  E.g. I found two
open-coded implementations of current, one in kernel_fpu_begin()
and one in math_state_restore().

> - It also allows per-CPU data to be allocated as each CPU is brought
>   up, rather than statically allocating it based on the maximum number
>   of CPUs which could be brought up.

Can you describe what it is about the way things work now that
prevents dynamic allocation?

-- 
Chuck
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