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

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Message-ID: <20171116083849.tvvxhu764uy5lryx@hirez.programming.kicks-ass.net>
Date:   Thu, 16 Nov 2017 09:38:49 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Wanpeng Li <kernellwp@...il.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        kvm <kvm@...r.kernel.org>, Paolo Bonzini <pbonzini@...hat.com>,
        Radim Kr??m???? <rkrcmar@...hat.com>,
        Wanpeng Li <wanpeng.li@...mail.com>
Subject: Re: [PATCH v5 2/4] KVM: X86: Add paravirt remote TLB flush

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
again.

Not nice :/