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

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Message-ID: <4FBDFF11.7030105@intel.com>
Date:	Thu, 24 May 2012 17:27:45 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Jan Beulich <JBeulich@...e.com>, borislav.petkov@....com,
	arnd@...db.de, 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,
	cpw@....com, steiner@....com, linux-kernel@...r.kernel.org,
	viro@...iv.linux.org.uk, hpa@...or.com,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one of siblings
 of SMT

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.
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