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[0/3] sched/fair: some fixes for asym_packing

Message ID 1533657387-29039-1-git-send-email-vincent.guittot@linaro.org
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Series sched/fair: some fixes for asym_packing | expand

Message

Vincent Guittot Aug. 7, 2018, 3:56 p.m. UTC 
During the review of misfit task patchset, Morten and Valentin raised some
problems with the use of SD_ASYM_PACKING flag on asymetric 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 isf needed)

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 | 33 +++++++++++++++++++++++++--------
 1 file changed, 25 insertions(+), 8 deletions(-)

-- 
2.7.4

Comments

Vincent Guittot Sept. 10, 2018, 12:40 p.m. UTC | #1 
Hi,

On Tue, 7 Aug 2018 at 17:56, Vincent Guittot <vincent.guittot@linaro.org> wrote:
>

> During the review of misfit task patchset, Morten and Valentin raised some

> problems with the use of SD_ASYM_PACKING flag on asymetric 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 isf needed)


Gentle ping on this patchset

>

> 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 | 33 +++++++++++++++++++++++++--------

>  1 file changed, 25 insertions(+), 8 deletions(-)

>

> --

> 2.7.4

>