From: Gregory Price <gourry@gourry.net>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Waiman Long <longman@redhat.com>,
Farhad Alemi <farhad.alemi@berkeley.edu>,
Andrew Morton <akpm@linux-foundation.org>,
Farhad Alemi <falemi@asu.edu>, Yury Norov <ynorov@nvidia.com>,
Joshua Hahn <joshua.hahnjy@gmail.com>, Zi Yan <ziy@nvidia.com>,
Matthew Brost <matthew.brost@intel.com>,
Rakie Kim <rakie.kim@sk.com>, Byungchul Park <byungchul@sk.com>,
Ying Huang <ying.huang@linux.alibaba.com>,
Alistair Popple <apopple@nvidia.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
cgroups@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v2] cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed
Date: Tue, 16 Jun 2026 09:44:53 -0400 [thread overview]
Message-ID: <ajFTVaMBeu-ViGIC@gourry-fedora-PF4VCD3F> (raw)
In-Reply-To: <51eafe6c-6622-479b-b391-6d3ff9350e75@kernel.org>
On Tue, Jun 16, 2026 at 08:59:07AM +0200, David Hildenbrand (Arm) wrote:
> On 6/16/26 05:43, Waiman Long wrote:
> > On 6/15/26 10:26 PM, Waiman Long wrote:
> >>
> >>
> >> The reason why I am suggesting to use cs->effective_mems to keep the old
> >> cgroup v1 behavior. If the consensus is to use the output of
> >> guarantee_online_mems() for mpol_rebind_mm(), I will not be against that but
> >> it will be a slight change in user-visible behavior.
I'm not grok'ing what is user-visible here.
The two values should effectively be equivalent because we're
using this value to constrain mpol's during a hotplug event.
If the values differed, you would be saying there's a race condition
that could affect correctness of the rebind (which can't happen,
because this whole thing is done under the hotplug lock btw).
Can you help me understand?
~Gregory
next prev parent reply other threads:[~2026-06-16 20:53 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-28 19:03 [PATCH] mm: don't allow empty relative nodemask in mpol_relative_nodemask() Yury Norov
2026-05-28 19:37 ` Waiman Long
2026-05-28 19:40 ` Yury Norov
2026-05-28 19:37 ` Matthew Wilcox
2026-05-28 19:41 ` Andrew Morton
2026-05-29 15:26 ` Joshua Hahn
2026-05-29 17:47 ` Yury Norov
2026-05-29 18:40 ` Joshua Hahn
2026-06-01 14:32 ` David Hildenbrand (Arm)
2026-06-02 8:44 ` Gregory Price
2026-06-02 9:19 ` David Hildenbrand (Arm)
2026-06-02 9:54 ` Gregory Price
2026-06-02 15:01 ` Farhad Alemi
2026-06-05 15:18 ` David Hildenbrand (Arm)
2026-06-09 23:57 ` [PATCH] cgroup/cpuset: rebind mm mempolicy to effective_mems, not mems_allowed Farhad Alemi
2026-06-10 0:53 ` Andrew Morton
2026-06-10 11:34 ` Gregory Price
2026-06-11 2:50 ` Waiman Long
2026-06-14 13:25 ` [PATCH v2] " Farhad Alemi
2026-06-15 8:08 ` David Hildenbrand (Arm)
2026-06-15 9:38 ` Gregory Price
2026-06-15 11:08 ` David Hildenbrand (Arm)
2026-06-15 11:19 ` Gregory Price
2026-06-15 11:39 ` David Hildenbrand (Arm)
[not found] ` <70f486ce-5ef6-4d72-8cc3-7086f4eea930@redhat.com>
[not found] ` <c1495b1b-9dee-4cd5-ac8e-eeb7a2d968ed@redhat.com>
[not found] ` <51eafe6c-6622-479b-b391-6d3ff9350e75@kernel.org>
2026-06-16 13:44 ` Gregory Price [this message]
2026-06-16 15:27 ` Waiman Long
2026-06-16 15:23 ` Waiman Long
2026-05-29 8:47 ` [PATCH] mm: don't allow empty relative nodemask in mpol_relative_nodemask() kernel test robot
2026-05-29 8:58 ` kernel test robot
2026-05-29 12:45 ` kernel test robot
2026-05-29 12:47 ` kernel test robot
2026-06-01 14:06 ` David Hildenbrand (Arm)
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