From: Waiman Long <longman@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Tejun Heo <tj@kernel.org>, Li Zefan <lizefan@huawei.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Ingo Molnar <mingo@redhat.com>,
cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-doc@vger.kernel.org, kernel-team@fb.com, pjt@google.com,
luto@amacapital.net, Mike Galbraith <efault@gmx.de>,
torvalds@linux-foundation.org, Roman Gushchin <guro@fb.com>,
Juri Lelli <juri.lelli@redhat.com>,
Patrick Bellasi <patrick.bellasi@arm.com>,
Tom Hromatka <tom.hromatka@oracle.com>
Subject: Re: [PATCH v14 05/12] cpuset: Add an error state to cpuset.sched.partition
Date: Tue, 6 Nov 2018 09:17:29 -0500 [thread overview]
Message-ID: <98a0b581-584b-ef6e-e38b-20ab601b7c05@redhat.com> (raw)
In-Reply-To: <20181106113712.GL22431@hirez.programming.kicks-ass.net>
On 11/06/2018 06:37 AM, Peter Zijlstra wrote:
> On Mon, Oct 15, 2018 at 04:29:30PM -0400, Waiman Long wrote:
>> Handling error returned by update_parent_subparts_cpumask() in
>> update_cpumasks_hier() is problematic as the states may become
>> inconsistent. To avoid that and increase flexibility in handling other
>> error cases, a new error state (-1) is added to the partition_root_state
>> flag. This new error state is set internally and user cannot write this
>> value to "cpuset.sched.partition".
>>
>> In this error state, the partition root becomes an erroneous one. It is
>> no longer a real partition root, but the CS_CPU_EXCLUSIVE flag will
>> still be set as it can be changed back to a real one if appropriate
>> change happens later on.
> I feel this Changelog should be much more explicit about the reasons
> this -1 state can happen. As is, I've got no clue.
OK, I will elaborate more on this changelog.
Cheers,
Longman
next prev parent reply other threads:[~2018-11-06 14:17 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-15 20:29 [PATCH v14 00/12] Enable cpuset controller in default hierarchy Waiman Long
2018-10-15 20:29 ` [PATCH v14 01/12] cpuset: " Waiman Long
2018-10-15 20:29 ` [PATCH v14 02/12] cpuset: Define data structures to support scheduling partition Waiman Long
2018-10-15 20:29 ` [PATCH v14 03/12] cpuset: Simply allocation and freeing of cpumasks Waiman Long
2018-10-19 15:28 ` Tom Hromatka
2018-10-15 20:29 ` [PATCH v14 04/12] cpuset: Add new v2 cpuset.sched.partition flag Waiman Long
2018-11-06 11:35 ` Peter Zijlstra
2018-10-15 20:29 ` [PATCH v14 05/12] cpuset: Add an error state to cpuset.sched.partition Waiman Long
2018-11-06 11:37 ` Peter Zijlstra
2018-11-06 14:17 ` Waiman Long [this message]
2018-11-06 11:40 ` Peter Zijlstra
2018-11-07 23:13 ` Waiman Long
2018-11-06 11:40 ` Peter Zijlstra
2018-10-15 20:29 ` [PATCH v14 06/12] cpuset: Track cpusets that use parent's effective_cpus Waiman Long
2018-10-15 20:29 ` [PATCH v14 07/12] cpuset: Make CPU hotplug work with partition Waiman Long
2018-10-15 20:29 ` [PATCH v14 08/12] cpuset: Make generate_sched_domains() " Waiman Long
2018-10-15 20:29 ` [PATCH v14 09/12] cpuset: Expose cpus.effective and mems.effective on cgroup v2 root Waiman Long
2018-10-15 20:29 ` [PATCH v14 10/12] cpuset: Add documentation about the new "cpuset.sched.partition" flag Waiman Long
2018-11-06 11:50 ` Peter Zijlstra
2018-11-06 14:09 ` Waiman Long
2018-11-07 22:58 ` Waiman Long
2018-10-15 20:29 ` [PATCH v14 11/12] cpuset: Expose cpuset.cpus.subpartitions with cgroup_debug Waiman Long
2018-10-15 20:29 ` [PATCH v14 12/12] cpuset: Show descriptive text when reading cpuset.sched.partition Waiman Long
2018-10-17 15:08 ` Tejun Heo
2018-10-17 15:20 ` Waiman Long
2018-10-19 18:56 ` Waiman Long
2018-10-19 19:24 ` Tejun Heo
2018-10-19 19:32 ` Waiman Long
2018-11-02 14:34 ` Waiman Long
2018-11-06 11:52 ` Peter Zijlstra
2018-11-05 16:36 ` [PATCH v14 00/12] Enable cpuset controller in default hierarchy Tejun Heo
2018-11-05 16:57 ` Peter Zijlstra
2018-11-06 11:53 ` Peter Zijlstra
2018-11-06 11:55 ` Peter Zijlstra
2018-11-06 14:06 ` Waiman Long
[not found] ` <CAOS58YPye=7Ga+y-ujFsgHqo6vdVnjykmON1z+UjNQLvvM_g4w@mail.gmail.com>
2018-11-06 14:11 ` Tejun Heo
2018-11-07 21:32 ` Tejun Heo
2018-11-07 21:52 ` Waiman Long
2018-11-08 9:41 ` Peter Zijlstra
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