linux-kernel - Re: [PATCH v5 7/8] KVM: Pre-allocate cpumasks for kvm_make_all_cpus_request

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Message-ID: <YTJMWaMGcaSwkwn3@google.com>
Date:   Fri, 3 Sep 2021 16:24:57 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        "Dr. David Alan Gilbert" <dgilbert@...hat.com>,
        Nitesh Narayan Lal <nitesh@...hat.com>,
        Lai Jiangshan <jiangshanlai@...il.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        Eduardo Habkost <ehabkost@...hat.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 7/8] KVM: Pre-allocate cpumasks for
 kvm_make_all_cpus_request_except()

On Fri, Sep 03, 2021, Vitaly Kuznetsov wrote:
> Allocating cpumask dynamically in zalloc_cpumask_var() is not ideal.
> Allocation is somewhat slow and can (in theory and when CPUMASK_OFFSTACK)
> fail. kvm_make_all_cpus_request_except() already disables preemption so
> we can use pre-allocated per-cpu cpumasks instead.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---

Reviewed-by: Sean Christopherson <seanjc@...gle.com>