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Date: Mon, 11 Feb 2002 21:26:44 -0800
From: Richard Henderson <rth@twiddle.net>
To: David Mosberger <davidm@hpl.hp.com>
Cc: "David S. Miller" <davem@redhat.com>, anton@samba.org,
        linux-kernel@vger.kernel.org, zippel@linux-m68k.org
Subject: Re: thread_info implementation
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In-Reply-To: <15464.36074.246502.582895@napali.hpl.hp.com>; from davidm@hpl.hp.com on Mon, Feb 11, 2002 at 07:32:58PM -0800
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On Mon, Feb 11, 2002 at 07:32:58PM -0800, David Mosberger wrote:
> The kernel has many paths that have sequential dependencies.  If there
> is no other work to do, the compiler won't help you.

Indeed.  A 2 cycle latency on a 4-issue processor means you have
to have quite a large block of code in order for the hot load to
be "free".

On another topic, I'm considering having $8 continue to be current
and using the two-insn stack mask to get current_thread_info and
measuring the size difference that makes.


r~
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