This is an archived copy of the Xen.org mailing list, which we have preserved to ensure that existing links to archives are not broken. The live archive, which contains the latest emails, can be found at http://lists.xen.org/
Home Products Support Community News


Re: [Xen-devel] ioctl and Xen

To: Dulloor <dulloor@xxxxxxxxx>
Subject: Re: [Xen-devel] ioctl and Xen
From: Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx>
Date: Fri, 7 Aug 2009 15:59:36 -0500
Cc: xen-devel@xxxxxxxxxxxxxxxxxxx, Marco Tizzoni <marco.tizzoni@xxxxxxxxx>
Delivery-date: Fri, 07 Aug 2009 14:00:10 -0700
Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type; bh=AaB47nznqdt6xL6/chYeekHG8HyTpYpzwxr85CNi0L8=; b=FnYO8ZgCXkJoXsxRgzkoTo4RbF/frApvTQIqd7X/SB1MXMPdY5/oxsMbLiLTz5ugy4 OXNiPJ1P5onJVflaaNYj094jHQc6j/rzG7dGNhHbx1rqA0SfJz2Y39arsF65gN5RDgIm 3A4ceWK1P/+z78GHUi76s+PLpz1OWAYAFkyp4=
Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type; b=q0b+1nryMsxw6JbjIwfzUh7bkztdlh2eT/stSi8zwFuQuE+cn15mL3zQeoM4yMG0Kb U9MIRv1R795GhzvmEKaJRuwt5FszK1J0NzVBSWLgxlOU8+IzHNp7ezlk3a0iJ6hc9xi7 sG+0NMUwr92xpCllkG8pPSsMDKgZdRjrj/G8E=
Envelope-to: www-data@xxxxxxxxxxxxxxxxxxx
In-reply-to: <940bcfd20908071322y3d5fe8ffv6f79cfb6d7ab5cb2@xxxxxxxxxxxxxx>
List-help: <mailto:xen-devel-request@lists.xensource.com?subject=help>
List-id: Xen developer discussion <xen-devel.lists.xensource.com>
List-post: <mailto:xen-devel@lists.xensource.com>
List-subscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=subscribe>
List-unsubscribe: <http://lists.xensource.com/mailman/listinfo/xen-devel>, <mailto:xen-devel-request@lists.xensource.com?subject=unsubscribe>
References: <e314beff0908071054l5d71e50dtf005219442f9a337@xxxxxxxxxxxxxx> <f9611b0f0908071229r412309f2r113c05d68426683b@xxxxxxxxxxxxxx> <e314beff0908071236p1a3118et7da15cbfaf83831f@xxxxxxxxxxxxxx> <940bcfd20908071322y3d5fe8ffv6f79cfb6d7ab5cb2@xxxxxxxxxxxxxx>
Sender: xen-devel-bounces@xxxxxxxxxxxxxxxxxxx
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. 


On 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.


On Fri, Aug 7, 2009 at 3:36 PM, Derek Riley <derek.riley@xxxxxxxxxxxxxxxxxxx> wrote:
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

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-devel mailing list

Xen-devel mailing list
<Prev in Thread] Current Thread [Next in Thread>