linux-kernel - Re: [PATCH] i386-pda UP optimization

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Message-ID: <455B53DD.1030305@goop.org>
Date:	Wed, 15 Nov 2006 09:52:29 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Eric Dumazet <dada1@...mosbay.com>
CC:	akpm@...l.org, Arjan van de Ven <arjan@...radead.org>, ak@...e.de,
	mingo@...e.hu, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] i386-pda UP optimization

Eric Dumazet wrote:
> I wish Jeremy give us patches for UP machines so that %gs can be let untouched 
> in entry.S (syscall entry/exit). A lot of ia32 machines are still using one 
> CPU.
>   
Unfortunately that would add cruft in a number of places.  At the
moment, context switch, ptrace and vm86 all assume entry.S has saved %gs
into pt_regs, so they can treat it like any other register.  If this
were conditional, it would require multiple places to add #ifndef
CONFIG_SMP code, which is not something I'd like to do without a good
reason.

    J
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