linux-kernel - Re: [PATCH v4 2/3] virtio-balloon: improve update_balloon_size

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Message-ID: <20190108071043.GB32048@kroah.com>
Date:   Tue, 8 Jan 2019 08:10:43 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wei Wang <wei.w.wang@...el.com>
Cc:     virtio-dev@...ts.oasis-open.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, virtualization@...ts.linux-foundation.org,
        kvm@...r.kernel.org, mst@...hat.com, cohuck@...hat.com,
        borntraeger@...ibm.com, pbonzini@...hat.com, dgilbert@...hat.com,
        pasic@...ux.ibm.com
Subject: Re: [PATCH v4 2/3] virtio-balloon: improve update_balloon_size_func

On Tue, Jan 08, 2019 at 12:50:04PM +0800, Wei Wang wrote:
> There is no need to update the balloon actual register when there is no
> ballooning request. This patch avoids update_balloon_size when diff is 0.
> 
> Signed-off-by: Wei Wang <wei.w.wang@...el.com>
> Reviewed-by: Cornelia Huck <cohuck@...hat.com>
> Reviewed-by: Halil Pasic <pasic@...ux.ibm.com>
> Tested-by: Christian Borntraeger <borntraeger@...ibm.com>
> ---
>  drivers/virtio/virtio_balloon.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 45d32f5..d48c12c 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -457,9 +457,12 @@ static void update_balloon_size_func(struct work_struct *work)
>  			  update_balloon_size_work);
>  	diff = towards_target(vb);
>  
> +	if (!diff)
> +		return;
> +
>  	if (diff > 0)
>  		diff -= fill_balloon(vb, diff);
> -	else if (diff < 0)
> +	else
>  		diff += leak_balloon(vb, -diff);
>  	update_balloon_size(vb);
>  
> -- 
> 2.7.4
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>