Re: [Xen-devel] [PATCH] Getting and setting SEDF scheduling parameters

Stephan Diestelhorst
2006-01-12T07:45:52Z

Thanks for that,
I''ll have a look at it!

Stephan

John L Griffin wrote:

>Here is a new patch to reflect Keir''s directions from last Friday.
Note
>that the patch only addresses the GET/PUT_INFO logic (not the correctness
>of the scheduler proper) but the scheduler seems to indeed be doing the
>right thing.
>
>This patch:
>
>1. Fixes an underflow bug in sedf_adjust_weights() that would cause the
><slice> for a weight-driven domain to be set to a really big number if
the
>CPU was already overcommitted.
>
>2. Clarifies the logic in sedf_adjdom().  Whenever (weight==0),
>time-driven scheduling is selected.  Otherwise, weight-driven scheduling
>is selected.  Extratime scheduling works for both modes.  [Note to Keir:
>in re your question, real-time weights only divvy up the spare
>non-time-sliced time according to the predetermined schedule.]
>
>3. Adds a heap of comments to the code, including five examples of how one
>might set the scheduling parameters.  Each of the five examples has been
>non-rigorously tested to work as described, but additional testing is
>warranted.
>
>One additional change I recommend is to add printk()''s to
sedf_adjdom()
>that indicate the failure of a scheduling operation, and possibly to
>indicate success as well, but that''s not included in this patch.
>
>Signed-off-by: jlg@us.ibm.com
>
>
>
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