linux-kernel - Re: [rfc] [patch 1/2] spin_lock_irq: Enable interrupts while spinning -- preperatory patch

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Date:	Wed, 3 Jan 2007 00:16:35 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Ravikiran G Thirumalai <kiran@...lex86.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...e.de>,
	"Shai Fultheim (Shai@...lex86.org)" <shai@...lex86.org>,
	pravin b shelar <pravin.shelar@...softinc.com>,
	"Benzi Galili (Benzi@...leMP.com)" <benzi@...lemp.com>
Subject: Re: [rfc] [patch 1/2] spin_lock_irq: Enable interrupts while
 spinning -- preperatory patch

On Tue, 2 Jan 2007 23:59:23 -0800
Ravikiran G Thirumalai <kiran@...lex86.org> wrote:

> The following patches do just that. The first patch is preparatory in nature
> and the second one changes the  x86_64 implementation of spin_lock_irq.
> Patch passed overnight runs of kernbench and dbench on 4 way x86_64 smp.

The end result of this is, I think, that i386 enables irqs while spinning
in spin_lock_irqsave() but not while spinning in spin_lock_irq().  And
x86_64 does the opposite.

Odd, isn't it?
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