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