linux-kernel - Re: [PATCH 1/9] cgroup/cpuset-v1: Add deprecation warnings to sched_load_balance and memory_pressure

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Message-ID: <5bw7yc6bacojk2i2ikhlmf2skfiix6t3ipchbnvyfttmyh644j@iyquxeuyapd7>
Date: Wed, 5 Mar 2025 11:12:21 +0100
From: Michal Koutný <mkoutny@...e.com>
To: Tejun Heo <tj@...nel.org>
Cc: Waiman Long <llong@...hat.com>, cgroups@...r.kernel.org, 
	linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, Josef Bacik <josef@...icpanda.com>, 
	Jens Axboe <axboe@...nel.dk>, Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH 1/9] cgroup/cpuset-v1: Add deprecation warnings to
 sched_load_balance and memory_pressure_enabled

On Tue, Mar 04, 2025 at 08:04:06AM -1000, Tejun Heo <tj@...nel.org> wrote:
> I'm apprehensive about adding warning messages which may be triggered
> consistently without anything end users can do about them.

That means you'd distinguish RE (replacement exists) vs DN (dropped as
non-ideal) categories?


> I think that deprecation messages, unless such deprecation is
> immediate and would have direct consequences on how the system can be
> used, should be informational.

I could subscribe to that if there weren't so many other places to
evaluate:
  $ git grep -i "pr_warn.*deprec" torvalds/master --  | wc -l
  62
  $ git grep -i "pr_info.*deprec" torvalds/master --  | wc -l
  2

So is the disctinction worth the hassle?

Michal

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