linux-kernel - Re: [RFC PATCH v1 0/9] freezer: Introduce freeze priority model to address process dependency issues

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Message-ID: <20250814143717.GY4067720@noisy.programming.kicks-ass.net>
Date: Thu, 14 Aug 2025 16:37:17 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Zihuan Zhang <zhangzihuan@...inos.cn>
Cc: "Rafael J . Wysocki" <rafael@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	David Hildenbrand <david@...hat.com>,
	Michal Hocko <mhocko@...e.com>, Jonathan Corbet <corbet@....net>,
	Ingo Molnar <mingo@...hat.com>, Juri Lelli <juri.lelli@...hat.com>,
	Vincent Guittot <vincent.guittot@...aro.org>,
	Dietmar Eggemann <dietmar.eggemann@....com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ben Segall <bsegall@...gle.com>, Mel Gorman <mgorman@...e.de>,
	Valentin Schneider <vschneid@...hat.com>,
	len brown <len.brown@...el.com>, pavel machek <pavel@...nel.org>,
	Kees Cook <kees@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	"Liam R . Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Mike Rapoport <rppt@...nel.org>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Catalin Marinas <catalin.marinas@....com>,
	Nico Pache <npache@...hat.com>, xu xin <xu.xin16@....com.cn>,
	wangfushuai <wangfushuai@...du.com>,
	Andrii Nakryiko <andrii@...nel.org>,
	Christian Brauner <brauner@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jeff Layton <jlayton@...nel.org>, Al Viro <viro@...iv.linux.org.uk>,
	Adrian Ratiu <adrian.ratiu@...labora.com>, linux-pm@...r.kernel.org,
	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC PATCH v1 0/9] freezer: Introduce freeze priority model to
 address process dependency issues

On Thu, Aug 07, 2025 at 08:14:09PM +0800, Zihuan Zhang wrote:

> Freeze Window Begins
> 
>     [process A] - epoll_wait()
>         │
>         ▼
>     [process B] - event source (already frozen)
> 

Can we make epoll_wait() TASK_FREEZABLE? AFAICT it doesn't hold any
resources, it just sits there waiting for stuff.