Re: [Xen-devel] what's the equivalent function to "schedule_timeout" in xen kernel?

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 16/11/15 06:36, Zhangbo (Oscar) wrote:
> Hi all:
> ããI'd like to SLEEP a while in xen kernel during VMEXIT,  the easiest way is 
> to call "udelay" or "mdelay" there. However, these 2 functions use busy wait 
> to sleep, which is a waste.
> ããIn linux kernel, there's a function named  'schedule_timeout', allowing the 
> CPU to run other tasks during SLEEPING. 
> ããSo, is there any equivalent function to "schedule_timeout" in xen kernel ? 
> ããThanks in advance.
> ãã

There is not any equivalent.  Paths through Xen are synchronous
(scheduling vCPUS has different requirements/constraints than scheduling
userspace tasks), and there are no concepts of tasks like the Linux
kernel has.

Your only option is to busy wait, but there is probably a different way
of achieving what you are attempting to do.

~Andrew

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