From: "Michal Koutný" <mkoutny@suse.com>
To: Juri Lelli <juri.lelli@redhat.com>, mathieu.poirier@linaro.org
Cc: peterz@infradead.org, mingo@redhat.com, rostedt@goodmis.org,
tj@kernel.org, linux-kernel@vger.kernel.org,
luca.abeni@santannapisa.it, claudio@evidence.eu.com,
tommaso.cucinotta@santannapisa.it, bristot@redhat.com,
lizefan@huawei.com, longman@redhat.com, dietmar.eggemann@arm.com,
cgroups@vger.kernel.org
Subject: Re: [PATCH v9 3/8] cpuset: Rebuild root domain deadline accounting information
Date: Mon, 4 Nov 2019 19:57:42 +0100 [thread overview]
Message-ID: <20191104185742.GC7827@blackbody.suse.cz> (raw)
In-Reply-To: <20190719140000.31694-4-juri.lelli@redhat.com>
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Hello.
I came across a cgroup_enable_task_cg_lists() call from the cpuset
controller...
On Fri, Jul 19, 2019 at 03:59:55PM +0200, Juri Lelli <juri.lelli@redhat.com> wrote:
> --- a/kernel/cgroup/cpuset.c
> +++ b/kernel/cgroup/cpuset.c
> [...]
> +static void rebuild_root_domains(void)
> +{
> + struct cpuset *cs = NULL;
> + struct cgroup_subsys_state *pos_css;
> +
> + lockdep_assert_held(&cpuset_mutex);
> + lockdep_assert_cpus_held();
> + lockdep_assert_held(&sched_domains_mutex);
> +
> + cgroup_enable_task_cg_lists();
...and I wonder why is it necessary to call at this place?
(IIUC, before cpuset hierarchy is anywhere mounted it's mere top_cpuset,
i.e. processing the top_cpuset alone is enough. And if anyone wants to
create any non-root cpusets, they have to mount the hierachy first, i.e.
no need to call cgroup_enable_task_cg_lists() manually. Also if I'm not
overlooking anything, the race between hotplug and mount (more precisely
new cpuset creation) should be synchronized by cpuset_mutex.)
Thanks,
Michal
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next prev parent reply other threads:[~2019-11-04 18:57 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-19 13:59 [PATCH v9 0/8] sched/deadline: fix cpusets bandwidth accounting Juri Lelli
2019-07-19 13:59 ` [PATCH v9 1/8] sched/topology: Adding function partition_sched_domains_locked() Juri Lelli
2019-07-25 16:19 ` [tip:sched/core] sched/topology: Add partition_sched_domains_locked() tip-bot for Mathieu Poirier
2019-07-19 13:59 ` [PATCH v9 2/8] sched/core: Streamlining calls to task_rq_unlock() Juri Lelli
2019-07-22 8:21 ` Dietmar Eggemann
2019-07-22 8:32 ` Juri Lelli
2019-07-22 9:08 ` Dietmar Eggemann
2019-07-23 10:32 ` Peter Zijlstra
2019-07-23 10:31 ` Peter Zijlstra
2019-07-23 13:11 ` Tejun Heo
2019-07-23 14:58 ` Juri Lelli
2019-07-25 16:20 ` [tip:sched/core] sched/core: Streamle " tip-bot for Mathieu Poirier
2019-07-19 13:59 ` [PATCH v9 3/8] cpuset: Rebuild root domain deadline accounting information Juri Lelli
2019-07-25 13:53 ` Ingo Molnar
2019-07-25 13:56 ` Ingo Molnar
2019-07-25 14:07 ` Juri Lelli
2019-07-25 16:00 ` Mathieu Poirier
2019-07-25 16:21 ` [tip:sched/core] cpusets: " tip-bot for Mathieu Poirier
2019-11-04 18:57 ` Michal Koutný [this message]
2019-11-05 12:03 ` [PATCH v9 3/8] cpuset: " Michal Koutný
2022-12-16 23:35 ` Qais Yousef
2022-12-17 2:26 ` Waiman Long
2022-12-17 22:10 ` Qais Yousef
2022-12-19 8:07 ` Vincent Guittot
2022-12-20 11:43 ` Qais Yousef
2023-01-15 16:41 ` Qais Yousef
2019-07-19 13:59 ` [PATCH v9 4/8] sched/deadline: Fix bandwidth accounting at all levels after offline migration Juri Lelli
2019-07-22 11:07 ` Dietmar Eggemann
2019-07-22 12:28 ` Juri Lelli
2019-07-22 13:21 ` Dietmar Eggemann
2019-07-22 13:35 ` Juri Lelli
2019-07-22 14:29 ` Dietmar Eggemann
2019-07-25 16:21 ` [tip:sched/core] " tip-bot for Juri Lelli
2019-07-19 13:59 ` [PATCH v9 5/8] cgroup/cpuset: convert cpuset_mutex to percpu_rwsem Juri Lelli
2019-07-25 16:22 ` [tip:sched/core] cgroup/cpuset: Convert " tip-bot for Juri Lelli
2019-07-19 13:59 ` [PATCH v9 6/8] cgroup/cpuset: Change cpuset_rwsem and hotplug lock order Juri Lelli
2019-07-25 16:23 ` [tip:sched/core] " tip-bot for Juri Lelli
2019-07-19 13:59 ` [PATCH v9 7/8] rcu/tree: Setschedule gp ktread to SCHED_FIFO outside of atomic region Juri Lelli
2019-07-25 16:24 ` [tip:sched/core] rcu/tree: Call setschedule() " tip-bot for Juri Lelli
2019-07-19 14:00 ` [PATCH v9 8/8] sched/core: Prevent race condition between cpuset and __sched_setscheduler() Juri Lelli
2019-07-25 16:24 ` [tip:sched/core] " tip-bot for Juri Lelli
2019-07-24 8:45 ` [PATCH v9 0/8] sched/deadline: fix cpusets bandwidth accounting Dietmar Eggemann
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