linux-kernel - Re: [PATCH v3 0/3] vmstats/vmevents flushing

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Message-Id: <20190824135339.46da90b968d92529641b3ed2@linux-foundation.org>
Date:   Sat, 24 Aug 2019 13:53:39 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Roman Gushchin <guro@...com>
Cc:     "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Michal Hocko <mhocko@...nel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>
Subject: Re: [PATCH v3 0/3] vmstats/vmevents flushing

On Fri, 23 Aug 2019 00:33:51 +0000 Roman Gushchin <guro@...com> wrote:

> On Thu, Aug 22, 2019 at 04:27:09PM -0700, Andrew Morton wrote:
> > On Mon, 19 Aug 2019 16:00:51 -0700 Roman Gushchin <guro@...com> wrote:
> > 
> > > v3:
> > >   1) rearranged patches [2/3] and [3/3] to make [1/2] and [2/2] suitable
> > >   for stable backporting
> > > 
> > > v2:
> > >   1) fixed !CONFIG_MEMCG_KMEM build by moving memcg_flush_percpu_vmstats()
> > >   and memcg_flush_percpu_vmevents() out of CONFIG_MEMCG_KMEM
> > >   2) merged add-comments-to-slab-enums-definition patch in
> > > 
> > > Thanks!
> > > 
> > > Roman Gushchin (3):
> > >   mm: memcontrol: flush percpu vmstats before releasing memcg
> > >   mm: memcontrol: flush percpu vmevents before releasing memcg
> > >   mm: memcontrol: flush percpu slab vmstats on kmem offlining
> > > 
> > 
> > Can you please explain why the first two patches were cc:stable but not
> > the third?
> > 
> > 
> 
> Because [1] and [2] are fixing commit 42a300353577 ("mm: memcontrol: fix
> recursive statistics correctness & scalabilty"), which has been merged into 5.2.
> 
> And [3] fixes commit fb2f2b0adb98 ("mm: memcg/slab: reparent memcg kmem_caches
> on cgroup removal"), which is in not yet released 5.3, so stable backport isn't
> required.

OK, thanks.  Patches 1 & 2 are good to go but I don't think that #3 has
had suitable review and I have a note here that Michal has concerns
with it.