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From: Tejun Heo <tj@kernel.org>
To: Waiman Long <longman@redhat.com>
Cc: "Zefan Li" <lizefan.x@bytedance.com>,
	"Johannes Weiner" <hannes@cmpxchg.org>,
	"Jonathan Corbet" <corbet@lwn.net>,
	"Shuah Khan" <shuah@kernel.org>,
	cgroups@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org,
	"Andrew Morton" <akpm@linux-foundation.org>,
	"Roman Gushchin" <guro@fb.com>, "Phil Auld" <pauld@redhat.com>,
	"Peter Zijlstra" <peterz@infradead.org>,
	"Juri Lelli" <juri.lelli@redhat.com>,
	"Frederic Weisbecker" <frederic@kernel.org>,
	"Marcelo Tosatti" <mtosatti@redhat.com>,
	"Michal Koutný" <mkoutny@suse.com>
Subject: Re: [PATCH v11 7/8] cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst
Date: Sun, 12 Jun 2022 17:12:51 -1000	[thread overview]
Message-ID: <YqarMyNo9oHxhZFh@slm.duckdns.org> (raw)
In-Reply-To: <404171dc-0da3-21f2-5003-9718f875e967@redhat.com>

Hello,

On Sun, Jun 12, 2022 at 11:02:38PM -0400, Waiman Long wrote:
> That is the behavior enforced by setting the CPU_EXCLUSIVE bit in cgroup v1.
> I haven't explicitly change it to make it different in cgroup v2. The major
> reason is that I don't want change to one cpuset to affect a sibling
> partition as it may make the code more complicate to validate if a partition
> is valid.

If at all possible, I'd really like to avoid situations where a parent can't
withdraw resources due to something that a descendant does.

Thanks.

-- 
tejun

WARNING: multiple messages have this Message-ID (diff)
From: Tejun Heo <tj-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
To: Waiman Long <longman-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: "Zefan Li" <lizefan.x-EC8Uxl6Npydl57MIdRCFDg@public.gmane.org>,
	"Johannes Weiner"
	<hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
	"Jonathan Corbet" <corbet-T1hC0tSOHrs@public.gmane.org>,
	"Shuah Khan" <shuah-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-doc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-kselftest-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	"Andrew Morton"
	<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
	"Roman Gushchin" <guro-b10kYP2dOMg@public.gmane.org>,
	"Phil Auld" <pauld-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Peter Zijlstra" <peterz-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	"Juri Lelli" <juri.lelli-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Frederic Weisbecker"
	<frederic-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	"Marcelo Tosatti"
	<mtosatti-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Michal Koutný" <mkoutny-IBi9RG/b67k@public.gmane.org>
Subject: Re: [PATCH v11 7/8] cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst
Date: Sun, 12 Jun 2022 17:12:51 -1000	[thread overview]
Message-ID: <YqarMyNo9oHxhZFh@slm.duckdns.org> (raw)
In-Reply-To: <404171dc-0da3-21f2-5003-9718f875e967-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

Hello,

On Sun, Jun 12, 2022 at 11:02:38PM -0400, Waiman Long wrote:
> That is the behavior enforced by setting the CPU_EXCLUSIVE bit in cgroup v1.
> I haven't explicitly change it to make it different in cgroup v2. The major
> reason is that I don't want change to one cpuset to affect a sibling
> partition as it may make the code more complicate to validate if a partition
> is valid.

If at all possible, I'd really like to avoid situations where a parent can't
withdraw resources due to something that a descendant does.

Thanks.

-- 
tejun

  reply	other threads:[~2022-06-13  3:13 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-10 15:34 [PATCH v11 0/8] cgroup/cpuset: cpu partition code enhancements Waiman Long
2022-05-10 15:34 ` [PATCH v11 1/8] cgroup/cpuset: Add top_cpuset check in update_tasks_cpumask() Waiman Long
2022-05-10 15:34   ` Waiman Long
2022-05-10 15:34 ` [PATCH v11 2/8] cgroup/cpuset: Miscellaneous cleanups & add helper functions Waiman Long
2022-05-10 15:34 ` [PATCH v11 3/8] cgroup/cpuset: Allow no-task partition to have empty cpuset.cpus.effective Waiman Long
2022-06-12 17:40   ` Tejun Heo
2022-06-12 17:41     ` Tejun Heo
2022-06-13  2:53       ` Waiman Long
2022-06-13  2:55         ` Tejun Heo
2022-06-13  3:04           ` Waiman Long
2022-06-13  3:04             ` Waiman Long
2022-06-13 14:02           ` Michal Koutný
2022-06-13 14:02             ` Michal Koutný
2022-06-13 16:47             ` Waiman Long
2022-06-13 16:47               ` Waiman Long
2022-06-13 17:23               ` Tejun Heo
2022-06-13  2:50     ` Waiman Long
2022-05-10 15:34 ` [PATCH v11 4/8] cgroup/cpuset: Relax constraints to partition & cpus changes Waiman Long
2022-05-10 15:34   ` Waiman Long
2022-05-10 15:34 ` [PATCH v11 5/8] cgroup/cpuset: Add a new isolated cpus.partition type Waiman Long
2022-05-10 15:34   ` Waiman Long
2022-05-10 15:34 ` [PATCH v11 6/8] cgroup/cpuset: Show invalid partition reason string Waiman Long
2022-05-10 15:34 ` [PATCH v11 7/8] cgroup/cpuset: Update description of cpuset.cpus.partition in cgroup-v2.rst Waiman Long
2022-06-12 17:49   ` Tejun Heo
2022-06-13  3:02     ` Waiman Long
2022-06-13  3:12       ` Tejun Heo [this message]
2022-06-13  3:12         ` Tejun Heo
2022-06-13 13:18         ` Waiman Long
2022-06-13 17:06           ` Waiman Long
2022-06-13 14:24         ` Michal Koutný
2022-06-13 14:24           ` Michal Koutný
2022-06-13 17:28           ` Tejun Heo
2022-06-13 17:55             ` Michal Koutný
2022-06-13 18:00               ` Tejun Heo
2022-06-13 18:00                 ` Tejun Heo
2022-06-14 11:53                 ` Michal Koutný
2022-06-14 11:53                   ` Michal Koutný
2022-06-27 19:10                   ` Tejun Heo
2022-06-27 19:10                     ` Tejun Heo
2022-06-30 14:32                     ` Michal Koutný
2022-06-30 22:53                       ` Tejun Heo
2022-05-10 15:34 ` [PATCH v11 8/8] kselftest/cgroup: Add cpuset v2 partition root state test Waiman Long
2022-05-21 10:24   ` Muhammad Usama Anjum
2022-05-21 10:24     ` Muhammad Usama Anjum
2022-05-22  2:40     ` Waiman Long
2022-05-20 16:00 ` [PATCH v11 0/8] cgroup/cpuset: cpu partition code enhancements Sebastian Andrzej Siewior
2022-05-20 16:46   ` Waiman Long
2022-05-24 16:48     ` Sebastian Andrzej Siewior

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