From: Arjan van de Ven <arjan@infradead.org>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>,
Venki Pallipadi <venkatesh.pallipadi@intel.com>,
Thomas Gleixner <tglx@linutronix.de>, Len Brown <lenb@kernel.org>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] x86: Voluntary leave_mm before entering ACPI C3
Date: Wed, 19 Dec 2007 23:53:57 -0800 [thread overview]
Message-ID: <20071219235357.53157cea@laptopd505.fenrus.org> (raw)
In-Reply-To: <4769757E.306@zytor.com>
On Wed, 19 Dec 2007 11:48:14 -0800
"H. Peter Anvin" <hpa@zytor.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..
--
If you want to reach me at my work email, use arjan@linux.intel.com
For development, discussion and tips for power savings,
visit http://www.lesswatts.org
next prev parent reply other threads:[~2007-12-20 7:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-12-19 18:34 Venki Pallipadi
2007-12-19 19:32 ` Ingo Molnar
2007-12-19 19:36 ` H. Peter Anvin
2007-12-19 19:40 ` Ingo Molnar
2007-12-19 19:48 ` H. Peter Anvin
2007-12-19 20:23 ` Venki Pallipadi
2007-12-20 7:53 ` Arjan van de Ven [this message]
2007-12-20 16:16 ` H. Peter Anvin
2007-12-20 18:22 ` Arjan van de Ven
2007-12-20 18:32 ` H. Peter Anvin
2007-12-20 19:28 ` Len Brown
2007-12-19 19:56 ` Venki Pallipadi
2007-12-19 20:54 ` Ingo Molnar
2007-12-20 2:08 ` Venki Pallipadi
2007-12-20 9:31 ` Ingo Molnar
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