linux-kernel - Re: [PATCH] x86: Voluntary leave

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Message-ID: <20071219235357.53157cea@laptopd505.fenrus.org>
Date:	Wed, 19 Dec 2007 23:53:57 -0800
From:	Arjan van de Ven <arjan@...radead.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Venki Pallipadi <venkatesh.pallipadi@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Len Brown <lenb@...nel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Voluntary leave_mm before entering ACPI C3

On Wed, 19 Dec 2007 11:48:14 -0800
"H. Peter Anvin" <hpa@...or.com> wrote:

> 
> I think C3 guarantees that the cache contents stay intact, and thus
> it might make sense in some technology to preserve the TLB as well
> (being a kind of cache.)

that sounds nice. It's fiction though ;-)

The thing to realize is that linux only sees "ACPI C3"; the BIOS maps that C3 to.. well any of the C states the processor in the system has. What you're saying is afaik correct for the *hardware* C3, not for the "C3" that Linux sees..


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