[RESEND PATCH v11 0/2] Make find_later_rq() choose a closer cpu in topology

From: Byungchul Park
Date: Wed May 09 2018 - 02:45:58 EST

Change from v10
-. modify a comment a bit as Steven suggested

Change from v9
-. modify a comment a bit so to be more clear as Juri suggested

Change from v8
-. add suggested-by Peterz
-. add several comments

Change from v7
-. fix a trivial typo
-. modify commit messages to explain what it does more clearly
-. simplify code with an existing macro

Change from v6
-. add a comment about selection of fallback_cpu incase more than one exist
-. modify a comment explaining what we do wrt PREFER_SIBLING

Change from v5
-. exclude two patches already picked up by peterz
(sched/deadline: Make find_later_rq() choose a closer cpu in topology)
(sched/deadline: Change return value of cpudl_find())
-. apply what peterz fixed for 'prefer sibling', into deadline and rt

Change from v4
-. remove a patch that might cause huge lock contention
(by spin lock(&cpudl.lock) in a hot path of scheduler)

Change from v3
-. rename closest_cpu to best_cpu so that it align with rt
-. protect referring cpudl.elements with cpudl.lock
-. change return value of cpudl_find() to bool

Change from v2
-. add support for SD_PREFER_SIBLING

Change from v1
-. clean up the patch

Byungchul Park (2):
sched/deadline: Add support for SD_PREFER_SIBLING on find_later_rq()
sched/rt: Add support for SD_PREFER_SIBLING on find_lowest_rq()

kernel/sched/deadline.c | 82 ++++++++++++++++++++++++++++++++++++++++++++-----
kernel/sched/rt.c | 80 +++++++++++++++++++++++++++++++++++++++++++++--
2 files changed, 152 insertions(+), 10 deletions(-)