From: Dietmar Eggemann <dietmar.eggemann@arm.com>
To: Valentin Schneider <valentin.schneider@arm.com>,
linux-kernel@vger.kernel.org
Cc: mingo@kernel.org, peterz@infradead.org, vincent.guittot@linaro.org
Subject: Re: [PATCH v2 3/9] sched: Remove checks against SD_LOAD_BALANCE
Date: Thu, 19 Mar 2020 11:28:37 +0100 [thread overview]
Message-ID: <c74a32d9-e40c-b976-be19-9ceea91d6fa7@arm.com> (raw)
In-Reply-To: <20200311181601.18314-4-valentin.schneider@arm.com>
On 11.03.20 19:15, Valentin Schneider wrote:
> Potential users of that flag could have been cpusets and isolcpus.
>
> cpusets don't need it because they define exclusive (i.e. non-overlapping)
> domain spans, see cpuset.cpu_exclusive and cpuset.sched_load_balance.
> If such a cpuset contains a single CPU, it will have the NULL domain
> attached to it. If it contains several CPUs, none of their domains will
> extend beyond the span of the cpuset.
There are also non-exclusive cpusets but I assume the statement is the same.
CPUs which are only used in cpusets with cpuset.sched_load_balance=0 are
attached to the NULL sched-domain.
There seems to be no code which alters the SD_LOAD_BALANCE flag.
[...]
next prev parent reply other threads:[~2020-03-19 10:28 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-11 18:15 [PATCH v2 0/9] sched: Streamline select_task_rq() & select_task_rq_fair() Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 1/9] sched/fair: find_idlest_group(): Remove unused sd_flag parameter Valentin Schneider
2020-03-19 9:05 ` Dietmar Eggemann
2020-03-11 18:15 ` [PATCH v2 2/9] sched/debug: Make sd->flags sysctl read-only Valentin Schneider
2020-03-19 9:07 ` Dietmar Eggemann
2020-03-19 12:04 ` Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 3/9] sched: Remove checks against SD_LOAD_BALANCE Valentin Schneider
2020-03-19 10:28 ` Dietmar Eggemann [this message]
2020-03-19 12:05 ` Valentin Schneider
2020-03-23 14:26 ` Dietmar Eggemann
2020-03-23 17:17 ` Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 4/9] sched/topology: Kill SD_LOAD_BALANCE Valentin Schneider
2020-03-19 10:29 ` Dietmar Eggemann
2020-03-19 12:06 ` Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 5/9] sched: Add WF_TTWU, WF_EXEC wakeup flags Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 6/9] sched: Kill select_task_rq()'s sd_flag parameter Valentin Schneider
2020-03-11 18:15 ` [PATCH v2 7/9] sched/fair: Dissociate wakeup decisions from SD flag value Valentin Schneider
2020-03-11 18:16 ` [PATCH v2 8/9] sched/fair: Split select_task_rq_fair want_affine logic Valentin Schneider
2020-03-19 10:30 ` Dietmar Eggemann
2020-03-19 12:06 ` Valentin Schneider
2020-03-11 18:16 ` [PATCH v2 9/9] sched/topology: Define and use shortcut pointers for wakeup sd_flag scan Valentin Schneider
2020-03-19 10:46 ` Dietmar Eggemann
2020-03-19 12:22 ` Valentin Schneider
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