!3774 [OLK-6.6] sched/fair: Scan cluster before scanning LLC in wake-up path

Merge Pull Request from: @liujie-248683921 
 
This is the follow-up work to support cluster scheduler. Previously
we have added cluster level in the scheduler for both ARM64[1] and
X86[2] to support load balance between clusters to bring more memory
bandwidth and decrease cache contention. This patchset, on the other
hand, takes care of wake-up path by giving CPUs within the same cluster
a try before scanning the whole LLC to benefit those tasks communicating
with each other.

[1] 778c558f ("sched: Add cluster scheduler level in core and related Kconfig for ARM64")
[2] 66558b73 ("sched: Add cluster scheduler level for x86")

Barry Song (2):
sched: Add cpus_share_resources API
sched/fair: Scan cluster before scanning LLC in wake-up path

Yicong Yang (1):
sched/fair: Use candidate prev/recent_used CPU if scanning failed for
cluster wakeup

include/linux/sched/sd_flags.h | 7 ++++
include/linux/sched/topology.h | 8 ++++-
kernel/sched/core.c | 12 +++++++
kernel/sched/fair.c | 58 +++++++++++++++++++++++++++++++---
kernel/sched/sched.h | 2 ++
kernel/sched/topology.c | 25 +++++++++++++++
6 files changed, 106 insertions(+), 6 deletions(-)

--
2.24.0 
 
Link:https://gitee.com/openeuler/kernel/pulls/3774

 

Reviewed-by: Zucheng Zheng <zhengzucheng@huawei.com>
Signed-off-by: Zheng Zengkai <zhengzengkai@huawei.com>