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Re: [Xen-devel] ioctl and Xen
- To: xen-devel@xxxxxxxxxxxxxxxxxxx
- From: Kuriakose Mathew <kmathew123@xxxxxxxxx>
- Date: Sat, 8 Aug 2009 16:27:23 +0530
- Cc: Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Sat, 08 Aug 2009 03:57:54 -0700
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Hi
Even I am looking for something similar. I came upon xenstore ,
through which we can write a particular value to a key and then read
the corresponding value. Even there is a concept of watch in xenstore
which gives a notification as to ,a value corresponding to a key has
changed. But I could read and write only from the userspace. If you
could read a key's value from kernel space , you are done. If you get
anything in this direction do inform.
-Mathew
On Sat, Aug 8, 2009 at 2:29 AM, Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx> wrote:
Thanks for the suggestion. It appears to me that the xentrace only implements one-way communication between the kernel and user space, but I need 2 way communication.
I know it is not the "right" way to do it, but is there a way to read/write a file within the scheduler? I am working on a 1-off implementation for a specialized project that will never make it into the main kernel.
Thanks --DerekOn Fri, Aug 7, 2009 at 3:22 PM, Dulloor <dulloor@xxxxxxxxx> wrote:
You can look at the way trace-bufs are implemented in xentrace. You will find xentrace in xen/tools.
-dulloor
Thanks for your reply. I am familiar with the files you listed, but they do not do what I need, nor do I see how they could be modified to do what I want (although I may be missing something).
I am trying to pass simple information in and out of the scheduler while it is running to a user process for monitoring and control. I just need an IPC method that is fast so it won't bog down the scheduler or the user space process. Any thoughts? Thanks
--Derek On Fri, Aug 7, 2009 at 2:29 PM, Marco Tizzoni <marco.tizzoni@xxxxxxxxx> wrote:
On Fri, Aug 7, 2009 at 7:54 PM, Derek
Riley< derek.riley@xxxxxxxxxxxxxxxxxxx> wrote:
> Hello developers-
> I am trying to modify the Xen Hypervisor kernel to pass information to and
> from a user space program to the domain scheduler (sched_credit),
I'm not experienced but I think you could have a look at:
xen/include/public/domctl.h
xen/include/public/sched.h
xen/include/public/sched-if.h
xen/common/sched_credit.c
tools/libxc/xc_csched.c
m-
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