linux-kernel - Re: [PATCHSET for-4.11] cgroup: avoid spurious identity ->*attach() invocations

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Message-ID: <20170116000430.GG14446@mtj.duckdns.org>
Date:   Sun, 15 Jan 2017 19:04:30 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Zefan Li <lizefan@...wei.com>
Cc:     hannes@...xchg.org, cgroups@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHSET for-4.11] cgroup: avoid spurious identity ->*attach()
 invocations

On Wed, Jan 11, 2017 at 06:46:33PM +0800, Zefan Li wrote:
> On 2016/12/30 6:11, Tejun Heo wrote:
> > Hello,
> > 
> > On the v2 hierarchy, when controllers are enabled and disabled, other
> > ->*attach() callbacks of other controllers are called spuriously with
> > the same source and destination.  While this isn't critical, it's a
> > bit nasty and can lead to temporary double charging on certain
> > controllers.  This patchset fixes the issue.
> > 
> > This patchset contains the following three patches.
> > 
> >  0001-cgroup-cosmetic-update-to-cgroup_taskset_add.patch
> >  0002-cgroup-track-migration-context-in-cgroup_mgctx.patch
> >  0003-cgroup-call-subsys-attach-only-for-subsystems-which-.patch
> > 
> > 0001-0002 restructures migration context tracking so that extra state
> > can be tracked easily.  0003 fixes the spurious ->*attach()
> > invocations.
> > 
> > This patchset is also available in the following git branch.
> > 
> >  git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup.git review-avoid-identity-attach
> > 
> > diffstat follows.
> > 
> >  kernel/cgroup/cgroup-internal.h |   69 +++++++++++++++--
> >  kernel/cgroup/cgroup-v1.c       |   10 +-
> >  kernel/cgroup/cgroup.c          |  161 ++++++++++++++++------------------------
> >  3 files changed, 135 insertions(+), 105 deletions(-)
> > 
> 
> Acked-by: Zefan Li <lizefan@...wei.com>

Applied to cgroup/for-4.11.

Thanks.

-- 
tejun