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

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To: Zihuan Zhang <zhangzihuan@xxxxxxxxxx>
Subject: Re: [RFC PATCH v1 0/9] freezer: Introduce freeze priority model to address process dependency issues
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 14 Aug 2025 16:37:17 +0200
Cc: "Rafael J . Wysocki" <rafael@xxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, David Hildenbrand <david@xxxxxxxxxx>, Michal Hocko <mhocko@xxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, Ingo Molnar <mingo@xxxxxxxxxx>, Juri Lelli <juri.lelli@xxxxxxxxxx>, Vincent Guittot <vincent.guittot@xxxxxxxxxx>, Dietmar Eggemann <dietmar.eggemann@xxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Ben Segall <bsegall@xxxxxxxxxx>, Mel Gorman <mgorman@xxxxxxx>, Valentin Schneider <vschneid@xxxxxxxxxx>, len brown <len.brown@xxxxxxxxx>, pavel machek <pavel@xxxxxxxxxx>, Kees Cook <kees@xxxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Lorenzo Stoakes <lorenzo.stoakes@xxxxxxxxxx>, "Liam R . Howlett" <Liam.Howlett@xxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxx>, Suren Baghdasaryan <surenb@xxxxxxxxxx>, Catalin Marinas <catalin.marinas@xxxxxxx>, Nico Pache <npache@xxxxxxxxxx>, xu xin <xu.xin16@xxxxxxxxxx>, wangfushuai <wangfushuai@xxxxxxxxx>, Andrii Nakryiko <andrii@xxxxxxxxxx>, Christian Brauner <brauner@xxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Jeff Layton <jlayton@xxxxxxxxxx>, Al Viro <viro@xxxxxxxxxxxxxxxxxx>, Adrian Ratiu <adrian.ratiu@xxxxxxxxxxxxx>, linux-pm@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-doc@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <20250807121418.139765-1-zhangzihuan@kylinos.cn>

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.

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  - From: Zihuan Zhang

References:
- [RFC PATCH v1 0/9] freezer: Introduce freeze priority model to address process dependency issues
  - From: Zihuan Zhang

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