netdev - Re: where change events in epoll_wait(), and who notify an epoll event?

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Message-ID: <20080729131023.GA26846@2ka.mipt.ru>
Date:	Tue, 29 Jul 2008 17:10:23 +0400
From:	Evgeniy Polyakov <johnpol@....mipt.ru>
To:	cpusoft <cpusoft@...il.com>
Cc:	netdev@...r.kernel.org
Subject: Re: where change events in epoll_wait(), and who notify an epoll event?

Hi.

On Tue, Jul 29, 2008 at 08:38:28PM +0800, cpusoft (cpusoft@...il.com) wrote:
> thanks alot. however, i still  wonder who call the driever's
> wake_up(&private_wait_queue_head)?

Driver itself. For example from interrupt. In network it is softirq
context via netif_receive_skb(), which in turn will call network
protocol receiving function (for example ip_rcv), which in turn will
call transport layer function (like udp_rcv), which will locate a
socket, queue skb there and call sk->sk_data_ready() callback, which is
a wake_up(&private_wait_queue_head) for the sockets.

-- 
	Evgeniy Polyakov
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