From: Tejun Heo <tj@kernel.org>
To: Tiffany Yang <ynaffit@google.com>
Cc: linux-kernel@vger.kernel.org, cgroups@vger.kernel.org,
kernel-team@android.com, "John Stultz" <jstultz@google.com>,
"Thomas Gleixner" <tglx@linutronix.de>,
"Stephen Boyd" <sboyd@kernel.org>,
"Anna-Maria Behnsen" <anna-maria@linutronix.de>,
"Frederic Weisbecker" <frederic@kernel.org>,
"Johannes Weiner" <hannes@cmpxchg.org>,
"Michal Koutný" <mkoutny@suse.com>,
"Rafael J. Wysocki" <rafael@kernel.org>,
"Pavel Machek" <pavel@kernel.org>,
"Roman Gushchin" <roman.gushchin@linux.dev>,
"Chen Ridong" <chenridong@huawei.com>,
"Ingo Molnar" <mingo@redhat.com>,
"Peter Zijlstra" <peterz@infradead.org>,
"Juri Lelli" <juri.lelli@redhat.com>,
"Vincent Guittot" <vincent.guittot@linaro.org>,
"Dietmar Eggemann" <dietmar.eggemann@arm.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Ben Segall" <bsegall@google.com>, "Mel Gorman" <mgorman@suse.de>,
"Valentin Schneider" <vschneid@redhat.com>
Subject: Re: [RFC PATCH] cgroup: Track time in cgroup v2 freezer
Date: Tue, 3 Jun 2025 13:03:51 -1000 [thread overview]
Message-ID: <aD9_V1rSqqESFekK@slm.duckdns.org> (raw)
In-Reply-To: <20250603224304.3198729-3-ynaffit@google.com>
On Tue, Jun 03, 2025 at 10:43:05PM +0000, Tiffany Yang wrote:
> The cgroup v2 freezer controller allows user processes to be dynamically
> added to and removed from an interruptible frozen state from
> userspace. This feature is helpful for application management, as it
> allows background tasks to be frozen to prevent them from being
> scheduled or otherwise contending with foreground tasks for resources.
> Still, applications are usually unaware of their having been placed in
> the freezer cgroup, so any watchdog timers they may have set will fire
> when they exit. To address this problem, I propose tracking the per-task
> frozen time and exposing it to userland via procfs.
Just on a glance, it feels rather odd to be tracking this per task given
that the state is per cgroup. Can you account this per cgroup?
Thanks.
--
tejun
next prev parent reply other threads:[~2025-06-03 23:03 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-03 22:43 Tiffany Yang
2025-06-03 23:03 ` Tejun Heo [this message]
2025-06-04 19:39 ` Tiffany Yang
2025-06-04 22:47 ` Tejun Heo
2025-06-27 2:19 ` Tiffany Yang
2025-06-27 19:01 ` Tejun Heo
2025-07-14 4:44 ` Tiffany Yang
2025-06-17 9:49 ` Michal Koutný
2025-06-27 7:47 ` Tiffany Yang
2025-06-30 17:40 ` Michal Koutný
2025-07-14 4:53 ` Tiffany Yang
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