linux-kernel - Re: [PATCH 1/2] virtio

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Date:   Tue, 19 Nov 2019 20:18:03 +0800
From:   Wei Wang <wei.w.wang@...el.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>, linux-kernel@...r.kernel.org
CC:     Khazhismel Kumykov <khazhy@...gle.com>,
        Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH 1/2] virtio_balloon: name cleanups

On 11/19/2019 06:29 PM, Michael S. Tsirkin wrote:
> free_page_order is a confusing name. It's not a page order
> actually, it's the order of the block of memory we are hinting.
> Rename to hint_block_order. Also, rename SIZE to BYTES
> to make it clear it's the block size in bytes.
>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>   drivers/virtio/virtio_balloon.c | 24 ++++++++++++------------
>   1 file changed, 12 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/virtio/virtio_balloon.c b/drivers/virtio/virtio_balloon.c
> index 65df40f261ab..b6a95cd28d9f 100644
> --- a/drivers/virtio/virtio_balloon.c
> +++ b/drivers/virtio/virtio_balloon.c
> @@ -32,10 +32,10 @@
>   #define VIRTIO_BALLOON_FREE_PAGE_ALLOC_FLAG (__GFP_NORETRY | __GFP_NOWARN | \
>   					     __GFP_NOMEMALLOC)
>   /* The order of free page blocks to report to host */
> -#define VIRTIO_BALLOON_FREE_PAGE_ORDER (MAX_ORDER - 1)
> +#define VIRTIO_BALLOON_HINT_BLOCK_ORDER (MAX_ORDER - 1)
>   /* The size of a free page block in bytes */
> -#define VIRTIO_BALLOON_FREE_PAGE_SIZE \
> -	(1 << (VIRTIO_BALLOON_FREE_PAGE_ORDER + PAGE_SHIFT))
> +#define VIRTIO_BALLOON_HINT_BLOCK_BYTES \
> +	(1 << (VIRTIO_BALLOON_HINT_BLOCK_ORDER + PAGE_SHIFT))
>   
>   #ifdef CONFIG_BALLOON_COMPACTION
>   static struct vfsmount *balloon_mnt;
> @@ -380,7 +380,7 @@ static unsigned long return_free_pages_to_mm(struct virtio_balloon *vb,
>   		if (!page)
>   			break;
>   		free_pages((unsigned long)page_address(page),
> -			   VIRTIO_BALLOON_FREE_PAGE_ORDER);
> +			   VIRTIO_BALLOON_HINT_BLOCK_ORDER);
>   	}
>   	vb->num_free_page_blocks -= num_returned;
>   	spin_unlock_irq(&vb->free_page_list_lock);
> @@ -582,7 +582,7 @@ static int get_free_page_and_send(struct virtio_balloon *vb)
>   		;
>   
>   	page = alloc_pages(VIRTIO_BALLOON_FREE_PAGE_ALLOC_FLAG,
> -			   VIRTIO_BALLOON_FREE_PAGE_ORDER);
> +			   VIRTIO_BALLOON_HINT_BLOCK_ORDER);
>   	/*
>   	 * When the allocation returns NULL, it indicates that we have got all
>   	 * the possible free pages, so return -EINTR to stop.
> @@ -591,13 +591,13 @@ static int get_free_page_and_send(struct virtio_balloon *vb)
>   		return -EINTR;
>   
>   	p = page_address(page);
> -	sg_init_one(&sg, p, VIRTIO_BALLOON_FREE_PAGE_SIZE);
> +	sg_init_one(&sg, p, VIRTIO_BALLOON_HINT_BLOCK_BYTES);
>   	/* There is always 1 entry reserved for the cmd id to use. */
>   	if (vq->num_free > 1) {
>   		err = virtqueue_add_inbuf(vq, &sg, 1, p, GFP_KERNEL);
>   		if (unlikely(err)) {
>   			free_pages((unsigned long)p,
> -				   VIRTIO_BALLOON_FREE_PAGE_ORDER);
> +				   VIRTIO_BALLOON_HINT_BLOCK_ORDER);
>   			return err;
>   		}
>   		virtqueue_kick(vq);
> @@ -610,7 +610,7 @@ static int get_free_page_and_send(struct virtio_balloon *vb)
>   		 * The vq has no available entry to add this page block, so
>   		 * just free it.
>   		 */
> -		free_pages((unsigned long)p, VIRTIO_BALLOON_FREE_PAGE_ORDER);
> +		free_pages((unsigned long)p, VIRTIO_BALLOON_HINT_BLOCK_ORDER);
>   	}
>   
>   	return 0;
> @@ -765,11 +765,11 @@ static unsigned long shrink_free_pages(struct virtio_balloon *vb,
>   	unsigned long blocks_to_free, blocks_freed;
>   
>   	pages_to_free = round_up(pages_to_free,
> -				 1 << VIRTIO_BALLOON_FREE_PAGE_ORDER);
> -	blocks_to_free = pages_to_free >> VIRTIO_BALLOON_FREE_PAGE_ORDER;
> +				 1 << VIRTIO_BALLOON_HINT_BLOCK_ORDER);
> +	blocks_to_free = pages_to_free >> VIRTIO_BALLOON_HINT_BLOCK_ORDER;
>   	blocks_freed = return_free_pages_to_mm(vb, blocks_to_free);
>   
> -	return blocks_freed << VIRTIO_BALLOON_FREE_PAGE_ORDER;
> +	return blocks_freed << VIRTIO_BALLOON_HINT_BLOCK_ORDER;
>   }
>   
>   static unsigned long leak_balloon_pages(struct virtio_balloon *vb,
> @@ -825,7 +825,7 @@ static unsigned long virtio_balloon_shrinker_count(struct shrinker *shrinker,
>   	unsigned long count;
>   
>   	count = vb->num_pages / VIRTIO_BALLOON_PAGES_PER_PAGE;
> -	count += vb->num_free_page_blocks << VIRTIO_BALLOON_FREE_PAGE_ORDER;
> +	count += vb->num_free_page_blocks << VIRTIO_BALLOON_HINT_BLOCK_ORDER;
>   
>   	return count;
>   }


Reviewed-by: Wei Wang <wei.w.wang@...el.com>

Best,
Wei