linux-kernel - Re: [PATCH v9 net-next 1/2] hv_sock: introduce Hyper-V Sockets

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Date:	Fri, 06 May 2016 13:03:53 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	decui@...rosoft.com
Cc:	gregkh@...uxfoundation.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, devel@...uxdriverproject.org,
	olaf@...fle.de, apw@...onical.com, jasowang@...hat.com,
	cavery@...hat.com, kys@...rosoft.com, haiyangz@...rosoft.com,
	joe@...ches.com, vkuznets@...hat.com
Subject: Re: [PATCH v9 net-next 1/2] hv_sock: introduce Hyper-V Sockets

From: Dexuan Cui <decui@...rosoft.com>
Date: Wed,  4 May 2016 09:56:57 -0700

> +#define VMBUS_RINGBUFFER_SIZE_HVSOCK_RECV (5 * PAGE_SIZE)
> +#define VMBUS_RINGBUFFER_SIZE_HVSOCK_SEND (5 * PAGE_SIZE)
> +
> +#define HVSOCK_RCV_BUF_SZ	VMBUS_RINGBUFFER_SIZE_HVSOCK_RECV
 ...
> +struct hvsock_sock {
 ...
> +	/* The 'hdr' and 'buf' in the below 'send' and 'recv' definitions must
> +	 * be consecutive: see hvsock_send_data() and hvsock_recv_data().
> +	 */
> +	struct {
> +		struct vmpipe_proto_header hdr;
> +		u8 buf[HVSOCK_SND_BUF_SZ];
> +	} send;
> +
> +	struct {
> +		struct vmpipe_proto_header hdr;
> +		u8 buf[HVSOCK_RCV_BUF_SZ];
> +
> +		unsigned int data_len;
> +		unsigned int data_offset;
> +	} recv;

I don't think allocating 5 pages of unswappable memory for every Hyper-V socket
created is reasonable.