From: "H. Peter Anvin" <hpa@zytor.com>
To: Ingo Molnar <mingo@elte.hu>
Cc: Chuck Ebbert <cebbert@redhat.com>,
linux-kernel@vger.kernel.org,
Arjan van de Ven <arjan@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>,
Li Zefan <lizf@cn.fujitsu.com>
Subject: Re: [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time, V2
Date: Thu, 02 Oct 2008 12:48:49 -0700 [thread overview]
Message-ID: <48E525A1.5080509@zytor.com> (raw)
In-Reply-To: <20081002194215.GA8078@elte.hu>
Ingo Molnar wrote:
>>
>> The default number of additional CPU IDs for hotplugging is determined
>> by asking ACPI or mptables how many "disabled" CPUs there are in the
>> system, but many systems get this wrong so that e.g. a uniprocessor
>> machine gets an extra CPU allocated and never switches to single CPU
>> mode.
>>
>> And sometimes CPU hotplugging is enabled only for suspend/hibernate
>> anyway, so the additional CPU IDs are not wanted. Allow the number to
>> be set to zero at compile time.
>>
Wouldn't this be better to have a runtime option?
-hpa
next prev parent reply other threads:[~2008-10-02 19:52 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-10-01 23:19 [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time Chuck Ebbert
2008-10-02 8:12 ` Ingo Molnar
2008-10-02 19:30 ` [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time, V2 Chuck Ebbert
2008-10-02 19:42 ` Ingo Molnar
2008-10-02 19:48 ` H. Peter Anvin [this message]
2008-10-02 19:50 ` Ingo Molnar
2008-10-02 9:12 ` [patch x86/core] x86: allow number of additional hotplug CPUs to be set at compile time Andi Kleen
2008-10-02 19:25 ` Chuck Ebbert
2008-10-02 19:44 ` Andi Kleen
2008-10-02 20:09 ` Chuck Ebbert
2008-10-02 20:40 ` Andi Kleen
2008-10-04 16:52 ` <PING> " Andi Kleen
2008-10-04 22:30 ` Chuck Ebbert
2008-10-05 10:28 ` Ingo Molnar
2008-10-05 14:52 ` Thomas Gleixner
2008-10-05 15:20 ` Ingo Molnar
2008-10-05 15:51 ` Thomas Gleixner
2008-10-05 15:56 ` Ingo Molnar
2008-10-05 20:39 ` Andi Kleen
2008-10-05 21:49 ` Thomas Gleixner
2008-10-05 22:45 ` Andi Kleen
2008-10-05 20:28 ` Andi Kleen
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