linux-kernel - Re: [PATCH v2 0/4] cgroup: nmi safe css_rstat

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Message-ID: <qtudjvrdvbsz6rrygb5bt32dzps6ocwefhr5hyfgtam65jowdo@colgnna6ogqm>
Date: Mon, 16 Jun 2025 12:20:28 -0700
From: Shakeel Butt <shakeel.butt@...ux.dev>
To: Tejun Heo <tj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, 
	JP Kobryn <inwardvessel@...il.com>, Johannes Weiner <hannes@...xchg.org>, 
	Michal Hocko <mhocko@...nel.org>, Roman Gushchin <roman.gushchin@...ux.dev>, 
	Muchun Song <muchun.song@...ux.dev>, Vlastimil Babka <vbabka@...e.cz>, 
	Alexei Starovoitov <ast@...nel.org>, Sebastian Andrzej Siewior <bigeasy@...utronix.de>, 
	Michal Koutný <mkoutny@...e.com>, Harry Yoo <harry.yoo@...cle.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>, bpf@...r.kernel.org, linux-mm@...ck.org, cgroups@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Meta kernel team <kernel-team@...a.com>
Subject: Re: [PATCH v2 0/4] cgroup: nmi safe css_rstat_updated

On Mon, Jun 16, 2025 at 08:15:17AM -1000, Tejun Heo wrote:
> Hello,
> 
> On Wed, Jun 11, 2025 at 03:15:28PM -0700, Shakeel Butt wrote:
> > Shakeel Butt (4):
> >   cgroup: support to enable nmi-safe css_rstat_updated
> >   cgroup: make css_rstat_updated nmi safe
> >   cgroup: remove per-cpu per-subsystem locks
> >   memcg: cgroup: call css_rstat_updated irrespective of in_nmi()
> 
> The patches look good to me. How should it be routed? Should I take all
> four, just the first three or would it better to route all through -mm?
> 

I would like all four to be together and since most of the code is in
cgroup, cgroup tree makes more sense unless Andrew has different
opinion.

thanks,
Shakeel