Re: [PATCH v7 8/8] x86/tlb: just do tlb flush on one ofsiblings of SMT

[Jan Beulich]

>>> On 24.05.12 at 11:27, Alex Shi <alex.shi@xxxxxxxxx> 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?

Jan

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