linux-kernel - Re: [PATCH v5 6/7] mm: reparent slab memory on cgroup removal

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Message-ID: <20190528215238.GD27847@tower.DHCP.thefacebook.com>
Date:   Tue, 28 May 2019 21:52:42 +0000
From:   Roman Gushchin <guro@...com>
To:     Vladimir Davydov <vdavydov.dev@...il.com>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        "Johannes Weiner" <hannes@...xchg.org>,
        Michal Hocko <mhocko@...nel.org>,
        Rik van Riel <riel@...riel.com>,
        Shakeel Butt <shakeelb@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "Waiman Long" <longman@...hat.com>
Subject: Re: [PATCH v5 6/7] mm: reparent slab memory on cgroup removal

On Tue, May 28, 2019 at 11:11:02PM +0300, Vladimir Davydov wrote:
> On Tue, May 28, 2019 at 07:58:17PM +0000, Roman Gushchin wrote:
> > It looks like outstanding questions are:
> > 1) synchronization around the dying flag
> > 2) removing CONFIG_SLOB in 2/7
> > 3) early sysfs_slab_remove()
> > 4) mem_cgroup_from_kmem in 7/7
> > 
> > Please, let me know if I missed anything.
> 
> Also, I think that it might be possible to get rid of RCU call in kmem
> cache destructor, because the cgroup subsystem already handles it and
> we could probably piggyback - see my comment to 5/7. Not sure if it's
> really necessary, since we already have RCU in SLUB, but worth looking
> into, I guess, as it might simplify the code a bit.

Added to the list. Thank you!