linux-kernel - Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings of SMT

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Date:	Thu, 24 May 2012 22:06:58 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	borislav.petkov@....com, arnd@...db.de,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	akinobu.mita@...il.com, eric.dumazet@...il.com, fweisbec@...il.com,
	rostedt@...dmis.org, hughd@...gle.com, jeremy@...p.org,
	len.brown@...el.com, tony.luck@...el.com, yongjie.ren@...el.com,
	kamezawa.hiroyu@...fujitsu.com, seto.hidetoshi@...fujitsu.com,
	penberg@...nel.org, yinghai@...nel.org, tglx@...utronix.de,
	akpm@...ux-foundation.org, ak@...ux.intel.com, luto@....edu,
	avi@...hat.com, dhowells@...hat.com, mingo@...hat.com,
	riel@...hat.com, Rusty Russell <rusty@...tcorp.com.au>,
	cpw@....com, steiner@....com, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, hpa@...or.com
Subject: Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings
 of SMT

On 05/24/2012 05:46 PM, Jan Beulich wrote:

>>>> On 24.05.12 at 11:27, Alex Shi <alex.shi@...el.com> wrote:
>> On 05/24/2012 04:42 PM, Peter Zijlstra wrote:
>>
>>> On Thu, 2012-05-24 at 16:32 +0800, Alex Shi wrote:
>>>> So, I use cpumask_t in stack.
>>>
>>> cpumask_t is 512 bytes with NR_CPUS=4096, that's generally considered
>>> too big to be on stack.
>>
>>
>> I am not consistent with cpumask_t.
>> I just want to know why it is too big on stack? Since if it causes
>> trouble in using, that mean current kernel will fail to run on 4096 CPU
>> system.
> 
> Why? Did you spot critical left-over instances of on-stack
> cpumask_t-s anywhere?


I aware it is a stupid question just after the e-mail sent out.
Thanks for you and PeterZ's nice reply!

> 
> Jan
> 


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