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Message-ID: <659fc57f-0c02-4bf2-9938-976200262145@redhat.com>
Date: Tue, 19 Mar 2024 09:54:24 +0100
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Subject: Re: [PATCH 2/2] virtio_balloon: Treat stats requests as wakeup events
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To: David Stevens <stevensd@chromium.org>,
 "Michael S . Tsirkin" <mst@redhat.com>
Cc: virtualization@lists.linux-foundation.org, linux-kernel@vger.kernel.org
References: <20240318091034.535573-1-stevensd@google.com>
 <20240318091034.535573-3-stevensd@google.com>
From: David Hildenbrand <david@redhat.com>
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In-Reply-To: <20240318091034.535573-3-stevensd@google.com>
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On 18.03.24 10:10, David Stevens wrote:
> From: David Stevens <stevensd@chromium.org>
> 
> Treat stats requests as wakeup events to ensure that the driver responds
> to device requests in a timely manner.
> 
> Signed-off-by: David Stevens <stevensd@chromium.org>
> ---
>   drivers/virtio/virtio_balloon.c | 75 ++++++++++++++++++++-------------
>   1 file changed, 46 insertions(+), 29 deletions(-)
> 
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 7fe7ef5f1c77..402dec98e08c 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -121,11 +121,14 @@ struct virtio_balloon {
>   	struct page_reporting_dev_info pr_dev_info;
>   
>   	/* State for keeping the wakeup_source active while adjusting the balloon */
> -	spinlock_t adjustment_lock;
> -	bool adjustment_signal_pending;
> -	bool adjustment_in_progress;
> +	spinlock_t wakeup_lock;
> +	bool processing_wakeup_event;
> +	u32 wakeup_signal_mask;
>   };
>   
> +#define ADJUSTMENT_WAKEUP_SIGNAL (1 << 0)
> +#define STATS_WAKEUP_SIGNAL (1 << 1)

I'd suggest a different naming like:

VIRTIO_BALLOON_WAKEUP_SIGNAL_ADJUST
VIRTIO_BALLOON_WAKEUP_SIGNAL_STATS


Apart from that, nothing jumped at me.

Acked-by: David Hildenbrand <david@redhat.com>

-- 
Cheers,

David / dhildenb