linux-kernel - Re: [PATCH RESEND v2 15/17] KVM: selftests: Add dirty ring buffer test

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Message-ID: <b0dc3d30-7fa5-3896-6905-9b1cb51d8d6c@redhat.com>
Date:   Tue, 24 Dec 2019 14:50:48 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Peter Xu <peterx@...hat.com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     Dr David Alan Gilbert <dgilbert@...hat.com>,
        Christophe de Dinechin <dinechin@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>
Subject: Re: [PATCH RESEND v2 15/17] KVM: selftests: Add dirty ring buffer
 test


On 2019/12/21 上午10:04, Peter Xu wrote:
> Add the initial dirty ring buffer test.
>
> The current test implements the userspace dirty ring collection, by
> only reaping the dirty ring when the ring is full.
>
> So it's still running asynchronously like this:


I guess you meant "synchronously" here.

Thanks


>
>              vcpu                             main thread
>
>    1. vcpu dirties pages
>    2. vcpu gets dirty ring full
>       (userspace exit)
>
>                                         3. main thread waits until full
>                                            (so hardware buffers flushed)
>                                         4. main thread collects
>                                         5. main thread continues vcpu
>
>    6. vcpu continues, goes back to 1