From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Serge E. Hallyn" Subject: Re: [PATCH 7/8] cgroup: mount cgroupns-root when inside non-init cgroupns Date: Wed, 2 Dec 2015 10:56:37 -0600 Message-ID: <20151202165637.GA20840@mail.hallyn.com> References: <1447703505-29672-1-git-send-email-serge@hallyn.com> <1447703505-29672-8-git-send-email-serge@hallyn.com> <20151124171610.GS17033@mtj.duckdns.org> <20151127051745.GA24521@mail.hallyn.com> <20151130150938.GF3535@mtj.duckdns.org> <20151201040704.GA31067@mail.hallyn.com> <20151201164649.GD12922@mtj.duckdns.org> <20151201215853.GA9153@mail.hallyn.com> <20151202165312.GB19878@mtj.duckdns.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <20151202165312.GB19878-qYNAdHglDFBN0TnZuCh8vA@public.gmane.org> Sender: linux-api-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tejun Heo Cc: "Serge E. Hallyn" , serge-A9i7LUbDfNHQT0dZR+AlfA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, adityakali-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org, linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, lxc-devel-cunTk1MwBs9qMoObBWhMNEqPaTDuhLve2LY78lusg7I@public.gmane.org, akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org, ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org List-Id: linux-api@vger.kernel.org On Wed, Dec 02, 2015 at 11:53:12AM -0500, Tejun Heo wrote: > Hello, Serge. > > On Tue, Dec 01, 2015 at 03:58:53PM -0600, Serge E. Hallyn wrote: > > I mispoke before though - it's not the hierarchy's root dentry, > > but rather a dentry for a descendent cgroup which will become the > > root dentry for the new superblock. We do know that there must be > > a css_set with a cgroup. I'm still trying to track down whether > > that cgrou's inode's dentry can ever be flushed. I would think > > not but am not sure. > > Hmmm... I'm not really following. The inode can be flushed and that's > why it needs to be walked down from root. What am I missing here? Can it be flushed when we know that the cgroup is being pinned by a css_set? (There's either a task or a cgroup_namespace pinning it or we wouldn't get here) -serge