Messages in this thread | | | From | Vincent Guittot <> | Subject | [PATCH v4 0/3] sched/fair: some fixes for asym_packing | Date | Thu, 17 Jan 2019 18:44:06 +0100 |
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During the review of misfit task patchset, Morten and Valentin raised some problems with the use of SD_ASYM_PACKING flag on asymmetric system like hikey960 arm64 big/LITTLE platform. The study of the use cases has shown some problems that can happen for every systems that use the flag.
The 3 patches fixes the problems raised for lmbench and the rt-app UC that creates 2 tasks that start as small tasks and then become suddenly always running tasks. (I can provide the rt-app json if needed)
Changes since v3: - simplify imbalance computation
Changes since v2: - include other active balance reasons - set imbalance to avg_load as suggested by Valentin
Changes since v1: - rebase on tip/sched/core - changes asym_active_balance() as suggested by Peter
Vincent Guittot (3): sched/fair: fix rounding issue for asym packing sched/fair: trigger asym_packing during idle load balance sched/fair: fix unnecessary increase of balance interval
kernel/sched/fair.c | 44 ++++++++++++++++++++++++++++---------------- 1 file changed, 28 insertions(+), 16 deletions(-)
-- 2.7.4
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