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Re: [PATCH 01/14] Introduce cpu_enabled_map and friends

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From: Andi Kleen <andi@...>
To: Matthew Wilcox <matthew@...>
Cc: Alex Chiang <achiang@...>, <linux-kernel@...>, <linux-arch@...>, <linux-acpi@...>
Subject: Re: [PATCH 01/14] Introduce cpu_enabled_map and friends
Date: Tuesday, July 15, 2008 - 6:03 am

Matthew Wilcox <matthew@wil.cx> writes:

He explained it in the intro, near the end (I nearly complained about
this too when I hadn't finished reading it completely :):

|The big picture implication is that we can allow userspace
|to interact with disabled CPUs. In this particular example,
|we provide a knob that lets a sysadmin schedule any present
|CPU for firmware deconfiguration or enablement.

The reason sounds pretty exotic, but ok.

-Andi
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Messages in current thread:
[PATCH 00/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Mon Jul 14, 10:33 pm)
RE: [PATCH 00/14] Introduce cpu_enabled_map and friends, Luck, Tony, (Tue Jul 15, 4:10 pm)
Re: [PATCH 00/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Tue Jul 15, 7:54 pm)
[PATCH 11/14] x86: Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:56 pm)
Re: [PATCH 11/14] x86: Populate cpu_enabled_map, H. Peter Anvin, (Fri Jul 18, 4:00 pm)
Re: [PATCH 11/14] x86: Populate cpu_enabled_map, Alex Chiang, (Fri Jul 18, 7:06 pm)
[PATCH 14/14] ACPI: Provide /sys/devices/system/cpu/cpuN/dec..., Alex Chiang, (Mon Jul 14, 10:34 pm)
Re: [PATCH 14/14] ACPI: Provide /sys/devices/system/cpu/cpuN..., Andi Kleen, (Tue Jul 15, 1:06 pm)
Re: [PATCH 14/14] ACPI: Provide /sys/devices/system/cpu/cpuN..., Alex Chiang, (Tue Jul 15, 2:40 pm)
[PATCH 07/14] [POWERPC] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
Re: [PATCH 07/14] [POWERPC] Populate cpu_enabled_map, Benjamin Herrenschmidt, (Tue Jul 15, 1:51 am)
Re: [PATCH 07/14] [POWERPC] Populate cpu_enabled_map, Alex Chiang, (Tue Jul 15, 9:04 pm)
[PATCH 01/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Mon Jul 14, 10:33 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Matthew Wilcox, (Mon Jul 14, 11:15 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Andi Kleen, (Tue Jul 15, 6:03 am)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Russell King, (Tue Jul 15, 6:21 am)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Tue Jul 15, 1:57 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Matthew Wilcox, (Tue Jul 15, 2:16 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Russell King, (Tue Jul 15, 2:48 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Tue Jul 15, 9:11 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Tue Jul 15, 3:15 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Russell King, (Fri Jul 18, 5:44 pm)
Re: [PATCH 01/14] Introduce cpu_enabled_map and friends, Alex Chiang, (Fri Jul 18, 7:08 pm)
[PATCH 13/14] [IA64] Avoid overflowing ia64_cpu_to_sapicid i..., Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 12/14] [IA64] Populate and use cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 09/14] [SH] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 08/14] [S390] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 06/14] [PARISC] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 05/14] [MIPS] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 04/14] [ARM] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:34 pm)
[PATCH 03/14] [ALPHA] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:33 pm)
[PATCH 02/14] [M32R] Populate cpu_enabled_map, Alex Chiang, (Mon Jul 14, 10:33 pm)