[Xen-devel] [PATCH] vcpu pin weight considerstion TAKE3

[Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>]

Hi, Keir and Emmanuel

This patch intends to correct the weight treatment for vcpu-pin.
Would you give me a comment on this?

 sched_credit.c |  115 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 files changed, 114 insertions(+), 1 deletion(-)


Current algorithm is 
1)calculate pcpu_weight based on all active vcpu.
  vcpu_weight = sdom->weight/sdom->online_vcpu_count(newly added variable)
  v->processor
  (This routine runs when vcpu count is changed, not every 30msec.)

2)calulate vcpupin_factor based on 
  avarage of vcpu-pinned-pcpu_weight/(csched_priv.weight/num_online_cpu())

3)consider above factor when credit is added in vcpu-pin case. 
  at atomic_add(credit_fair, &svc->credit);

Signed-off-by: Atsushi SAKAI <sakaia@xxxxxxxxxxxxxx>

Difference from previous patch(+365 lines) is

1)credit_balance consideration factor is omitted (about -150 lines)
2)detailed pcpu_weight calculation is changed (about -100 lines) 
  (currently uses v->processor instead of vcpu->cpu_affinity)

Thanks
Atsushi SAKAI

Attachment: vcpupin0710.patch
Description: Binary data

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