Re: [PATCH v5 2/4] KVM: X86: Add paravirt remote TLB flush

From: Peter Zijlstra
Date: Thu Nov 16 2017 - 03:39:36 EST

On Thu, Nov 16, 2017 at 01:30:57PM +0800, Wanpeng Li wrote:
> -static DEFINE_PER_CPU(cpumask_var_t, __pv_tlb_mask);
> +static DEFINE_PER_CPU(cpumask_t, __pv_tlb_mask);

NR_CPUS=512 is a fairly common distro setting, that means cpumask_t is
64 bytes. So for my 144 CPU system, that is 9216 bytes I'll never see

Not nice :/