From: Vincent Guittot <vincent.guittot@linaro.org>
To: peterz@infradead.org, mingo@kernel.org, linux-kernel@vger.kernel.org
Cc: valentin.schneider@arm.com, Morten.Rasmussen@arm.com,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: [PATCH v4 0/3] sched/fair: some fixes for asym_packing
Date: Thu, 17 Jan 2019 18:44:06 +0100 [thread overview]
Message-ID: <1547747049-6320-1-git-send-email-vincent.guittot@linaro.org> (raw)
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
next reply other threads:[~2019-01-17 17:44 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-17 17:44 Vincent Guittot [this message]
2019-01-17 17:44 ` [PATCH v4 1/3] sched/fair: fix rounding issue for asym packing Vincent Guittot
2019-01-17 17:44 ` [PATCH v4 2/3] sched/fair: trigger asym_packing during idle load balance Vincent Guittot
2019-01-17 17:44 ` [PATCH v4 3/3] sched/fair: fix unnecessary increase of balance interval Vincent Guittot
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