From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Valentin Schneider <valentin.schneider@arm.com>,
linux-kernel@vger.kernel.org
Cc: peterz@infradead.org, mingo@kernel.org,
vincent.guittot@linaro.org, patrick.bellasi@matbug.net,
qperret@google.com, qais.yousef@arm.com,
morten.rasmussen@arm.com
Subject: Re: [PATCH v3 0/5] sched/fair: Task placement biasing using uclamp
Date: Thu, 12 Dec 2019 16:06:38 +0100 [thread overview]
Message-ID: <7c9caf20-de5b-3fa2-2663-e712ba3d7829@arm.com> (raw)
In-Reply-To: <20191211113851.24241-1-valentin.schneider@arm.com>
On 11/12/2019 12:38, Valentin Schneider wrote:
> Hi,
>
> While uclamp restrictions currently only impact schedutil's frequency
> selection, it would make sense to also let them impact CPU selection in
> asymmetric topologies. This would let us steer specific tasks towards
> certain CPU capacities regardless of their actual utilization - I give a
> few examples in patch 4.
>
> The first three patches are mainly cleanups, the meat of the thing is
> in patches 4 and 5.
>
> Note that this is in the same spirit as what Patrick had proposed for EAS
> on Android [1]
>
> [1]: https://android.googlesource.com/kernel/common/+/b61876ed122f816660fe49e0de1b7ee4891deaa2%5E%21
Reviewed-by: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested-By: Dietmar Eggemann <dietmar.eggemann@arm.com>
Tested on Juno-r0 (Arm64) cpumask [0x3f] w/ big [0x06], LITTLE [0x39]
[orig cpu capacity big,LITTLE: 1024,446] and rt-app
4 periodic tasks runtime/period [800/16000], per task uclamp_min/max
[600,1024]
w/o uclamp: EAS puts the tasks on LITTLE CPUs [0x39]
w/ uclamp: EAS puts the tasks on big CPUs [0x06]
next prev parent reply other threads:[~2019-12-12 15:06 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 11:38 Valentin Schneider
2019-12-11 11:38 ` [PATCH v3 1/5] sched/uclamp: Remove uclamp_util() Valentin Schneider
2019-12-25 10:39 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2019-12-11 11:38 ` [PATCH v3 2/5] sched/uclamp: Make uclamp util helpers use and return UL values Valentin Schneider
2019-12-25 10:39 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2019-12-11 11:38 ` [PATCH v3 3/5] sched/uclamp: Rename uclamp_util_with() into uclamp_rq_util_with() Valentin Schneider
2019-12-25 10:39 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2019-12-11 11:38 ` [PATCH v3 4/5] sched/fair: Make task_fits_capacity() consider uclamp restrictions Valentin Schneider
2019-12-25 10:39 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2019-12-11 11:38 ` [PATCH v3 5/5] sched/fair: Make EAS wakeup placement " Valentin Schneider
2019-12-25 10:38 ` [tip: sched/core] " tip-bot2 for Valentin Schneider
2019-12-12 15:06 ` Dietmar Eggemann [this message]
2019-12-20 15:04 ` [PATCH v3 0/5] sched/fair: Task placement biasing using uclamp Peter Zijlstra
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