Linux Power Management: Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states


Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
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To: Boris Ostrovsky <boris.ostrovsky@xxxxxxx>
Subject: Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
From: Tony Luck <tony.luck@xxxxxxxxx>
Date: Mon, 2 Apr 2012 11:02:44 -0700
Cc: linux-acpi@xxxxxxxxxxxxxxx, linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, Len Brown <len.brown@xxxxxxxxx>
Delivered-to: linux-pm@xxxxxxxxxxxxxxxxxxxxxxxx
In-reply-to: <4F79E83C.5090506@amd.com>
References: <09f98a825a821f7a3f1b162f9ed023f37213a63b.1333101989.git.len.brown@intel.com> <1333102459-23750-1-git-send-email-lenb@kernel.org> <1a022e3f1be11730bd8747b1af96a0274bf6356e.1333101989.git.len.brown@intel.com> <CA+8MBbLROfbyfAGZ0xn1tZVHsndeTUNrn=-gHhsfzkocBLh=iQ@mail.gmail.com> <CA+8MBbJnrhKmy5f_pbL8Ogi1ihM-51hfqCDY5gUQ1hkvw7p22Q@mail.gmail.com> <4F79E83C.5090506@amd.com>

> x86 halt() causes processor to go to C1 state (which is often not the
> deepest). But other than that it seems similar to what you are describing.

OK - then Konrad's suggestion of using "safe_halt()" here rather than
"halt()" would work for ia64.

Other architectures don't use APCI - so this should just be localized to
x86 and ia64

-Tony
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Follow-Ups:
- Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
  - From: Boris Ostrovsky

References:
- [PATCH 01/76] x86, acpi, tboot: Have a ACPI os prepare sleep instead of calling tboot_sleep.
  - From: Len Brown
- ACPI & Power Management patches for Linux-3.4
  - From: Len Brown
- [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
  - From: Len Brown
- Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
  - From: Tony Luck
- Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
  - From: Tony Luck
- Re: [PATCH 58/76] idle, x86: Allow off-lined CPU to enter deeper C states
  - From: Boris Ostrovsky

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