Hi.
I have been trying to apply Linaro's HMP scheduler to a big.LITTLE machine, which has 4 big and 4 LITTLE cores. However, I could only utilize two cores with the HMP scheduler.
While hmp_select_faster_cpu() always selects the first core in the big cluster and hmp_select_slower_cpu() always selects the first core in the LITTLE cluster, I found that my kernel with the HMP scheduler does no load-balancing at all within each HMP domain(big/LITTLE cluster).
The function rebalance_domains() does almost nothing, because SD_LOAD_BALANCE flags for the sched_domains are always false. It's the same in select_task_rq_fair().
I'm wondering if this is normal, although I believe it shouldn't be. If it's not, how can I get the HMP scheduler to perform load-balancing within an HMP domain? What might I be doing wrong here?
Thanks.
- Antonio
Adding its author in cc.
On 27 June 2013 14:16, J nsyncme07@gmail.com wrote:
Hi.
I have been trying to apply Linaro's HMP scheduler to a big.LITTLE machine, which has 4 big and 4 LITTLE cores. However, I could only utilize two cores with the HMP scheduler.
While hmp_select_faster_cpu() always selects the first core in the big cluster and hmp_select_slower_cpu() always selects the first core in the LITTLE cluster, I found that my kernel with the HMP scheduler does no load-balancing at all within each HMP domain(big/LITTLE cluster).
The function rebalance_domains() does almost nothing, because SD_LOAD_BALANCE flags for the sched_domains are always false. It's the same in select_task_rq_fair().
I'm wondering if this is normal, although I believe it shouldn't be. If it's not, how can I get the HMP scheduler to perform load-balancing within an HMP domain? What might I be doing wrong here?
Thanks.
- Antonio
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