linux-kernel - [PATCH v2 0/2] cpuset: Allow v2 behavior in v1 cgroup

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Message-Id: <1502994339-21668-1-git-send-email-longman@redhat.com>
Date:   Thu, 17 Aug 2017 14:25:37 -0400
From:   Waiman Long <longman@...hat.com>
To:     Tejun Heo <tj@...nel.org>, Li Zefan <lizefan@...wei.com>,
        Johannes Weiner <hannes@...xchg.org>
Cc:     linux-kernel@...r.kernel.org, Waiman Long <longman@...hat.com>
Subject: [PATCH v2 0/2] cpuset: Allow v2 behavior in v1 cgroup

v1->v2:
 - Drop the kernel command line option and use cgroupfs mount option
   instead to enable v2 controller behavior in v1 cgroup.

v1: https://lkml.org/lkml/2017/8/15/570

This patchset adds a new cgroupfs mount option "v2_mode" that serves
as a hint that a v1 controller can use v2 hehavior, if applicable.
The cpuset controller is then modified to observe this mode.

Patch 1 adds the v1 cgroupfs mount option "v2_mode" which set a flag
in the cgroup_root flags.

Patch 2 modifies the cpuset controller to check the cgroup_root flag
and switch to v2 behavior even in a v1 cgroup.

Waiman Long (2):
  cgroup: Add a hint to allow v1 controller to use v2 behavior
  cpuset: Allow v2 behavior in v1 cgroup

 include/linux/cgroup-defs.h |  5 +++++
 kernel/cgroup/cgroup-v1.c   |  6 ++++++
 kernel/cgroup/cpuset.c      | 33 ++++++++++++++++++++-------------
 3 files changed, 31 insertions(+), 13 deletions(-)

-- 
1.8.3.1