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Re: [Qemu-devel] Linux kernel polling for QEMU
From: |
Eliezer Tamir |
Subject: |
Re: [Qemu-devel] Linux kernel polling for QEMU |
Date: |
Mon, 28 Nov 2016 11:31:43 +0200 |
User-agent: |
Mozilla/5.0 (Windows NT 6.3; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.5.0 |
+ Eric, Willem
On 24/11/2016 17:12, Stefan Hajnoczi wrote:
> I looked through the socket SO_BUSY_POLL and blk_mq poll support in
> recent Linux kernels with an eye towards integrating the ongoing QEMU
> polling work. The main missing feature is eventfd polling support which
> I describe below.
...
> State of polling in Linux
> -------------------------
> SO_BUSY_POLL causes recvmsg(2), select(2), and poll(2) family system
> calls to spin awaiting new receive packets. From what I can tell epoll
> is not supported so that system call will sleep without polling.
At the time I sent out an RFC for epoll() SO_BUSY_POLL support.
https://lkml.org/lkml/2013/8/21/192
In hindsight I think the way I tracked sockets was over-complicated.
What I would do today would be to extend the API to allow the user
to tell epoll which socket/queue combinations are interesting.
I would love to collaborate on this with you, though I must confess that
my resources at the moment are limited and the setup I used for testing
no longer exists.
-Eliezer
Re: [Qemu-devel] Linux kernel polling for QEMU, Christian Borntraeger, 2016/11/29
Re: [Qemu-devel] Linux kernel polling for QEMU, Fam Zheng, 2016/11/29