[Xen-devel] [RFC PATCH v3 0/2] xen: credit2: flexible configuration for runqueues

[Praveen Kumar <kpraveen.lkml@xxxxxxxxx>]

Hello,

The idea is to give user more flexibility to configure runqueue further.
For most workloads and in most systems, using per-core means have too many
small runqueues. Using per-socket is almost always better, but it may result
in too few big runqueues.

OPTION 1 :
--------
The user can create runqueue per-cpu using Xen boot parameter like below:

 credit2_runqueue=cpu

which would mean the following:
 - pCPU 0 belong to runqueue 0
 - pCPU 1 belong to runqueue 1
 - pCPU 2 belong to runqueue 2
 and so on.

OPTION 2 :
--------
Further user can be allowed to say something shown below :

 credit2_runqueue=0,1,4,5;2,3,6,7;8,9,12,13;10,11,14,15

or (with exactly the same meaning, but a perhaps more clear syntax):

 credit2_runqueue=[[0,1,4,5][2,3,6,7][8,9,12,13][10,11,14,15]]

which would mean the following:
 - pCPUs 0, 1, 4 and 5 belong to runqueue 0
 - pCPUs 2, 3, 6 and 7 belong to runqueue 1
 - pCPUs 8, 9, 12 and 13 belong to runqueue 2
 - pCPUs 10, 11, 14 and 15 belong to runqueue 3

Thanks and Regards,
Praveen Kumar.
---
v3 has proper subject for RFC
---
Praveen Kumar (2):
  xen: credit2: enable per cpu runqueue creation
  xen: credit2: provide flexible option to create runqueue

 docs/misc/xen-command-line.markdown |   9 +-
 xen/common/sched_credit2.c          | 185 +++++++++++++++++++++++++++++++++++-
 2 files changed, 188 insertions(+), 6 deletions(-)

-- 
2.12.0


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