linux-kernel - Re: [RFC PATCH v2] cgroup: Track time in cgroup v2 freezer

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Message-ID: <aHktgqO3BUg8exXH@slm.duckdns.org>
Date: Thu, 17 Jul 2025 07:06:10 -1000
From: Tejun Heo <tj@...nel.org>
To: Chen Ridong <chenridong@...weicloud.com>
Cc: Michal Koutný <mkoutny@...e.com>,
	Tiffany Yang <ynaffit@...gle.com>, linux-kernel@...r.kernel.org,
	John Stultz <jstultz@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Boyd <sboyd@...nel.org>,
	Anna-Maria Behnsen <anna-maria@...utronix.de>,
	Frederic Weisbecker <frederic@...nel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	"Rafael J. Wysocki" <rafael@...nel.org>,
	Pavel Machek <pavel@...nel.org>,
	Roman Gushchin <roman.gushchin@...ux.dev>,
	Chen Ridong <chenridong@...wei.com>, kernel-team@...roid.com,
	Jonathan Corbet <corbet@....net>, cgroups@...r.kernel.org,
	linux-doc@...r.kernel.org
Subject: Re: [RFC PATCH v2] cgroup: Track time in cgroup v2 freezer

On Thu, Jul 17, 2025 at 09:52:38PM +0800, Chen Ridong wrote:
> > With the given implementation (and use scenario), this'd better exposed
> > in
> >   cgroup.freeze.stat.local
> > 
> 
> Would it be possible to add this field to either cgroup.event or cgroup.stat?
> Since the frozen status is already tracked in cgroup.event, this placement would maintain better
> cohesion with existing metrics.
> 
> This is just a suggestion.

Yeah, given that the freezer is an integral part of cgroup core, using
cgroup.stat[.local] probably makes more sense.

Thanks.

-- 
tejun