From: Yinghai Lu <yinghai@kernel.org>
To: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
"ananth@in.ibm.com" <ananth@in.ibm.com>,
Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH -v2 5/5] x86: use dmi check to treat disabled cpus as hotplug cpus.
Date: Tue, 12 Jan 2010 16:05:13 -0800 [thread overview]
Message-ID: <4B4D0E39.10200@kernel.org> (raw)
In-Reply-To: <1263340563.2854.1011.camel@sbs-t61.sc.intel.com>
On 01/12/2010 03:56 PM, Suresh Siddha wrote:
> On Tue, 2010-01-12 at 15:17 -0800, Yinghai Lu wrote:
>> some systems that have disable cpus entries because same
>> BIOS will support 2 sockets and 4 sockets and more at
>> same time, BIOS just leave some disable entries, but
>> those system do not support cpu hotplug. we don't need
>> treat disabled_cpus as hotplug cpus.
>> so we can make nr_cpu_ids smaller and save more space
>> (pcpu data allocations), and could make some systems run
>> with logical flat instead of physical flat apic mode
>>
>> -v2: change to black list instead
>
> I don't think this list will work because every HT system with HT
> disabled in the bios shows that logical cpu as disabled.
so you want to treat those disabled cpus in the those system as hotplug cpus or not?
YH
next prev parent reply other threads:[~2010-01-13 0:06 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-12 23:17 [PATCH 0/5] clean up logical flat apic mode using Yinghai Lu
2010-01-12 23:17 ` [PATCH -v2 1/5] use nr_cpus= to set nr_cpu_ids early Yinghai Lu
2010-01-12 23:17 ` [PATCH 2/5] x86: using logical flat for amd cpu too Yinghai Lu
2010-01-12 23:17 ` [PATCH -v2 3/5] x86: according to nr_cpu_ids to decide if need to leave logical flat Yinghai Lu
2010-01-12 23:17 ` [PATCH -v2 5/5] x86: use dmi check to treat disabled cpus as hotplug cpus Yinghai Lu
2010-01-12 23:56 ` Suresh Siddha
2010-01-13 0:05 ` Yinghai Lu [this message]
2010-01-13 1:48 ` Suresh Siddha
2010-01-13 1:55 ` Yinghai Lu
2010-01-13 2:06 ` Suresh Siddha
2010-01-13 2:13 ` Yinghai Lu
2010-01-13 2:21 ` Suresh Siddha
2010-01-13 2:26 ` Yinghai Lu
2010-01-13 21:46 ` Andi Kleen
2010-01-13 22:00 ` H. Peter Anvin
2010-01-13 22:23 ` Andi Kleen
2010-01-13 22:27 ` H. Peter Anvin
2010-01-13 22:29 ` Suresh Siddha
2010-01-13 22:36 ` H. Peter Anvin
2010-01-13 22:49 ` Suresh Siddha
2010-01-13 23:02 ` Yinghai Lu
2010-01-13 23:13 ` H. Peter Anvin
2010-01-13 23:52 ` Andi Kleen
2010-01-14 9:25 ` Andi Kleen
2010-01-12 23:17 ` [PATCH 4/5] x86: make 32bit apic flat to physflat switch like 64bit Yinghai Lu
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